Generalized Multi-Protocol Label Switching (GMPLS) Signaling Extensions for the evolving G.709 Optical Transport Networks Control
draft-ietf-ccamp-gmpls-signaling-g709v3-05
The information below is for an old version of the document.
| Document | Type |
This is an older version of an Internet-Draft that was ultimately published as RFC 7139.
|
|
|---|---|---|---|
| Authors | Fatai Zhang , Guoying Zhang , Sergio Belotti , Daniele Ceccarelli , Khuzema Pithewan | ||
| Last updated | 2012-11-30 | ||
| Replaces | draft-zhang-ccamp-gmpls-evolving-g709 | ||
| RFC stream | Internet Engineering Task Force (IETF) | ||
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| Additional resources | Mailing list discussion | ||
| Stream | WG state | Waiting for WG Chair Go-Ahead | |
| Document shepherd | Lou Berger | ||
| IESG | IESG state | Became RFC 7139 (Proposed Standard) | |
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draft-ietf-ccamp-gmpls-signaling-g709v3-05
Network Working Group Fatai Zhang, Ed.
Internet Draft Huawei
Updates: 4328 Guoying Zhang
Category: Standards Track CATR
Sergio Belotti
Alcatel-Lucent
D. Ceccarelli
Ericsson
Khuzema Pithewan
Infinera
Expires: May 30, 2013 November 30, 2012
Generalized Multi-Protocol Label Switching (GMPLS) Signaling
Extensions for the evolving G.709 Optical Transport Networks Control
draft-ietf-ccamp-gmpls-signaling-g709v3-05.txt
Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with
the provisions of BCP 78 and BCP 79.
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The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt.
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This Internet-Draft will expire on May 30, 2013.
Abstract
ITU-T Recommendation G.709 [G709-2012] has introduced new Optical
channel Data Unit (ODU) containers (ODU0, ODU4, ODU2e and ODUflex)
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and enhanced Optical Transport Networking (OTN) flexibility.
This document updates RFC4328 to provide the extensions to the
Generalized Multi-Protocol Label Switching (GMPLS) signaling to
control the evolving OTN addressing ODUk multiplexing and new
features including ODU0, ODU4, ODU2e and ODUflex.
Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
Table of Contents
1. Introduction .................................................. 3
2. Terminology ................................................... 3
3. GMPLS Extensions for the Evolving G.709 - Overview ............ 3
4. Generalized Label Request ..................................... 4
5. Extensions for Traffic Parameters for the Evolving G.709 ...... 6
5.1. Usage of ODUflex(CBR) Traffic Parameters ................. 8
5.2. Usage of ODUflex(GFP) Traffic Parameters ................ 10
6. Generalized Label ............................................ 11
6.1. OTN-TDM Switching Type Generalized Label ................ 11
6.2. Procedures .............................................. 13
6.2.1. Notification on Label Error ........................ 15
6.3. Supporting Virtual Concatenation and Multiplication ..... 15
6.4. Examples ................................................ 15
7. Supporting Hitless Adjustment of ODUflex (GFP) ............... 17
8. Control Plane Backward Compatibility Considerations........... 18
9. Security Considerations ...................................... 19
10. IANA Considerations.......................................... 19
11. References .................................................. 20
11.1. Normative References ................................... 20
11.2. Informative References ................................. 21
12. Contributors ................................................ 21
13. Authors' Addresses .......................................... 22
14. Acknowledgment .............................................. 24
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1. Introduction
With the evolution and deployment of OTN technology, it is necessary
that appropriate enhanced control technology support be provided for
[G709-2012].
[OTN-FWK] provides a framework to allow the development of protocol
extensions to support GMPLS and Path Computation Element (PCE)
control of OTN as specified in [G709-2012]. Based on this framework,
[OTN-INFO] evaluates the information needed by the routing and
signaling process in OTNs to support GMPLS control of OTN.
[RFC4328] describes the control technology details that are specific
to the 2001 revision of the G.709 specification. This document
updates [RFC4328] to provide Resource ReserVation Protocol-Traffic
Engineering (RSVP-TE) extensions to support of control for [G709-
2012].
2. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
3. GMPLS Extensions for the Evolving G.709 - Overview
New features for the evolving OTN, for example, new ODU0, ODU2e, ODU4
and ODUflex containers are specified in [G709-2012]. The
corresponding new signal types are summarized below:
- Optical Channel Transport Unit (OTUk):
. OTU4
- Optical Channel Data Unit (ODUk):
. ODU0
. ODU2e
. ODU4
. ODUflex
A new Tributary Slot Granularity (TS Granularity, TSG) (i.e., 1.25
Gbps) is also described in [G709-2012]. Thus, there are now two TS
granularities for the foundation OTN ODU1, ODU2 and ODU3 containers.
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The TS granularity at 2.5 Gbps is used on legacy interfaces while the
new 1.25 Gbps is used on the new interfaces.
In addition to the support of ODUk mapping into OTUk (k = 1, 2, 3,
4), the evolving OTN [G.709-V3] encompasses the multiplexing of ODUj
(j = 0, 1, 2, 2e, 3, flex) into an ODUk (k > j), as described in
Section 3.1.2 of [OTN-FWK].
Virtual Concatenation (VCAT) of Optical channel Payload Unit-k (OPUk)
(OPUk-Xv, k = 1/2/3, X = 1...256) is also supported by [G709-2012].
Note that VCAT of OPU0 / OPU2e / OPU4 / OPUflex is not supported per
[G709-2012].
[RFC4328] describes GMPLS signaling extensions to support the control
for the 2001 revision of the G.709 specification. However, [RFC4328]
needs to be updated because it does not provide the means to signal
all the new signal types and related mapping and multiplexing
functionalities. Moreover, it supports only the deprecated auto-
Multiframe Structure Identifier (MSI) mode which assumes that the
Tributary Port Number (TPN) is automatically assigned in the transmit
direction and not checked in the receive direction.
This document extends the G.709 traffic parameters described in
[RFC4328] and presents a new flexible and scalable OTN label format.
Additionally, procedures about Tributary Port Number assignment
through control plane are also provided in this document.
4. Generalized Label Request
The Generalized Label Request, as described in [RFC3471], carries the
Label Switched Path (LSP) Encoding Type, the Switching Type and the
Generalized Protocol Identifier (G-PID).
[RFC4328] extends the Generalized Label Request, introducing two new
code-points for the LSP Encoding Type (i.e., G.709 ODUk (Digital
Path) and G.709 Optical Channel) and adding a list of G-PID values in
order to accommodate the 2001 revision of the G.709 specification.
This document follows these extensions and a new Switching Type is
introduced to indicate the ODUk switching capability [G709-2012] in
order to support backward compatibility with [RFC4328], as described
in [OTN-FWK]. The new Switching Type (101, TBA by IANA) is defined in
[OTN-OSPF].
This document also updates the G-PID values defined in [RFC4328]:
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Value G-PID Type
----- ----------
47 ODU-2.5G: transport of Digital Paths (e.g., at 2.5, 10 and
40 Gbps) via 2.5Gbps TSG
49 CBRa: asynchronous Constant Bit Rate (CBR) (e.g.,
mapping of CBR2G5, CBR10G and CBR40G)
50 CBRb: bit synchronous Constant Bit Rate (e.g., mapping
of CBR2G5, CBR10G, CBR40G, CBR10G3 and supra-
2.488 CBR Gbit/s signal (carried by OPUflex))
32 ATM: mapping of Asynchronous Transfer Mode (ATM) cell
stream (e.g., at 1.25, 2.5, 10 and 40 Gbps)
51 BSOT: non-specific client Bit Stream with Octet Timing
(e.g., Mapping of 1.25, 2.5, 10, 40 and 100 Gbps
Bit Stream)
52 BSNT: non-specific client Bit Stream without Octet
Timing (e.g., Mapping of 1.25, 2.5, 10, 40 and
100 Gbps Bit Stream)
Note: Values 32, 47, 49 and 50 include mapping of Synchronous Digital
Hierarchy (SDH).
In the case of ODU multiplexing, the Lower Order ODU (LO ODU) (i.e.,
the client signal) may be multiplexed into Higher Order ODU (HO ODU)
via 1.25G TSG, 2.5G TSG or any one of them (i.e., TSG
Auto_Negotiation is enabled). Since the G-PID type "ODUk" defined in
[RFC4328] is only used for 2.5Gbps TSG, two new G-PID types are
defined as follows:
- ODU-1.25G: transport of Digital Paths at 1.25, 2.5, 10, 40 and 100
Gbps via 1.25Gbps TSG
- ODU-any: transport of Digital Paths at 1.25, 2.5, 10, 40 and 100
Gbps via 1.25 or 2.5Gbps TSG (i.e., the fallback
procedure is enabled and the default value of 1.25Gbps
TSG can be fallen back to 2.5Gbps if needed)
In addition, some other new G-PID types are defined to support other
new client signals described in [G709-2012]:
- CBRc: Mapping of constant bit-rate signals with justification
into OPUk (k = 0, 1, 2, 3, 4) via Generic Mapping
Procedure (GMP) (i.e., mapping of sub-1.238, supra-
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1.238 to sub-2.488, close-to 9.995, close-to 40.149
and close-to 104.134 Gbit/s CBR client signal)
- 1000BASE-X: Mapping of a 1000BASE-X signal via timing transparent
transcoding into OPU0
- FC-1200: Mapping of a FC-1200 signal via timing transparent
transcoding into OPU2e
The following table summarizes the new G-PID values with respect to
the LSP Encoding Type:
Value G-PID Type LSP Encoding Type
----- ---------- -----------------
59(TBA) G.709 ODU-1.25G G.709 ODUk
60(TBA) G.709 ODU-any G.709 ODUk
61(TBA) CBRc G.709 ODUk
62(TBA) 1000BASE-X G.709 ODUk (k=0)
63(TBA) FC-1200 G.709 ODUk (k=2e)
Note: Values 59 and 60 include mapping of SDH.
5. Extensions for Traffic Parameters for the Evolving G.709
The traffic parameters for OTN-TDM capable Switching Type are carried
in the OTN-TDM SENDER_TSPEC and FLOWSPEC objects. The objects have
the following class and type:
- OTN-TDM SENDER_TSPEC Object: Class = 12, C-Type = 7 (TBA)
- OTN-TDM FLOWSPEC Object: Class = 9, C-Type = 7 (TBA)
The format of traffic parameters in these two objects are defined as
follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Signal Type | Reserved | Tolerance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| NVC | Multiplier (MT) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Bit_Rate |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The valid Signal Type values defined in [RFC4328] are updated to be:
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Value Type
----- ----
0 Not significant
1 ODU1 (i.e., 2.5 Gbps)
2 ODU2 (i.e., 10 Gbps)
3 ODU3 (i.e., 40 Gbps)
4 ODU4 (i.e., 100 Gbps)
5 Reserved (for future use)
6 Optical Channel (Och) at 2.5 Gbps
7 OCh at 10 Gbps
8 OCh at 40 Gbps
9 OCh at 100 Gbps
10 ODU0 (i.e., 1.25 Gbps)
11 ODU2e (i.e., 10Gbps for FC1200 and GE LAN)
12~19 Reserved (for future use)
20 ODUflex(CBR) (i.e., 1.25*N Gbps)
21 ODUflex(Generic Framing Procedure-Framed (GFP-F)),
resizable (i.e., 1.25*N Gbps)
22 ODUflex(GFP-F), non resizable (i.e., 1.25*N Gbps)
23~255 Reserved (for future use)
In case of ODUflex(CBR), the Bit_Rate and Tolerance fields MUST be
used together to represent the actual bandwidth of ODUflex, where:
- The Bit_Rate field indicates the nominal bit rate of ODUflex(CBR)
expressed in bytes per second, encoded as a 32-bit IEEE single-
precision floating-point number (referring to [RFC4506] and
[IEEE]). The value contained in the Bit Rate field has to keep
into account both 239/238 factor and the Transcoding factor.
- The Tolerance field indicates the bit rate tolerance (part per
million, ppm) of the ODUflex(CBR) encoded as an unsigned integer,
which MUST be bounded in 0~100ppm.
For example, for an ODUflex(CBR) service with Bit_Rate = 2.5Gbps and
Tolerance = 100ppm, the actual bandwidth of the ODUflex is:
2.5Gbps * (1 +/- 100ppm)
In case of ODUflex(GFP), the Bit_Rate field is used to indicate the
nominal bit rate of the ODUflex(GFP), which implies the number of
tributary slots requested for the ODUflex(GFP). Since the tolerance
of ODUflex(GFP) makes no sense on tributary slot resource
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reservation, the Tolerance field for ODUflex(GFP) is not necessary
and MUST be filled with 0.
In case of other ODUk signal types, the Bit_Rate and Tolerance fields
are not necessary and MUST be set to 0.
The usage of the NVC and Multiplier (MT) fields are the same as
[RFC4328].
Note that the error process on the traffic parameters MUST follow the
rules defined in Section 6 of [RFC4328].
5.1. Usage of ODUflex(CBR) Traffic Parameters
In case of ODUflex(CBR), the information of Bit_Rate and Tolerance in
the ODUflex traffic parameters MUST be used to determine the total
number of tributary slots N in the HO ODUk link to be reserved. Here:
N = Ceiling of
ODUflex(CBR) nominal bit rate * (1 + ODUflex(CBR) bit rate tolerance)
---------------------------------------------------------------------
ODTUk.ts nominal bit rate * (1 - HO OPUk bit rate tolerance)
In this formula, the ODUflex(CBR) nominal bit rate is the bit rate of
the ODUflex(CBR) on the line side, i.e., the client signal bit rate
after applying the 239/238 factor (according to Clause 7.3, Table 7-2
of [G709-2012]) and the transcoding factor T (if needed) on the CBR
client. According to clauses 17.7.3, 17.7.4 and 17.7.5 of [G709-
2012]:
ODUflex(CBR) nominal bit rate = CBR client bit rate * (239/238) / T
The ODTUk.ts (Optical channel Data Tributary Unit k with ts tributary
slots) nominal bit rate is the nominal bit rate of the tributary slot
of ODUk, as shown in Table 1 (referring to Table 7-7 of [G709-2012]).
Table 1 - Actual TS bit rate of ODUk (in Kbps)
ODUk.ts Minimum Nominal Maximum
-----------------------------------------------------------
ODU2.ts 1,249,384.632 1,249,409.620 1,249,434.608
ODU3.ts 1,254,678.635 1,254,703.729 1,254,728.823
ODU4.ts 1,301.683.217 1,301,709.251 1,301,735.285
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Note that:
Minimum bit rate of ODUTk.ts =
ODTUk.ts nominal bit rate * (1 - HO OPUk bit rate tolerance)
Maximum bit rate of ODTUk.ts =
ODTUk.ts nominal bit rate * (1 + HO OPUk bit rate tolerance)
Where: HO OPUk bit rate tolerance = 20ppm
Therefore, a node receiving a PATH message containing ODUflex(CBR)
nominal bit rate and tolerance can allocate precise number of
tributary slots and set up the cross-connection for the ODUflex
service.
Note that for different ODUk, the bit rates of the tributary slots
are different, and so the total number of tributary slots to be
reserved for the ODUflex(CBR) MAY not be the same on different HO
ODUk links.
An example is given below to illustrate the usage of ODUflex(CBR)
traffic parameters.
As shown in Figure 1, assume there is an ODUflex(CBR) service
requesting a bandwidth of (2.5Gbps, +/-100ppm) from node A to node C.
In other words, the ODUflex traffic parameters indicate that Signal
Type is 20 (ODUflex(CBR)), Bit_Rate is 2.5Gbps and Tolerance is
100ppm.
+-----+ +---------+ +-----+
| +-------------+ +-----+ +-------------+ |
| +=============+\| ODU |/+=============+ |
| +=============+/| flex+-+=============+ |
| +-------------+ | |\+=============+ |
| +-------------+ +-----+ +-------------+ |
| | | | | |
| | ....... | | ....... | |
| A +-------------+ B +-------------+ C |
+-----+ HO ODU4 +---------+ HO ODU2 +-----+
=========: TS occupied by ODUflex
---------: free TS
Figure 1 - Example of ODUflex(CBR) Traffic Parameters
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- On the HO ODU4 link between node A and B:
The maximum bit rate of the ODUflex(CBR) equals 2.5Gbps * (1 +
100ppm), and the minimum bit rate of the tributary slot of ODU4
equals 1,301,683.217 Kbps, so the total number of tributary slots
N1 to be reserved on this link is:
N1 = ceiling (2.5Gbps * (1 + 100ppm) / 1,301,683.217 Kbps) = 2
- On the HO ODU2 link between node B and C:
The maximum bit rate of the ODUflex equals 2.5Gbps * (1 +
100ppm), and the minimum bit rate of the tributary slot of ODU2
equals 1,249,384.632 Kbps, so the total number of tributary slots
N2 to be reserved on this link is:
N2 = ceiling (2.5Gbps * (1 + 100ppm) / 1,249,384.632 Kbps) = 3
5.2. Usage of ODUflex(GFP) Traffic Parameters
[G709-2012] recommends that the ODUflex(GFP) will fill an integral
number of tributary slots of the smallest HO ODUk path over which the
ODUflex(GFP) may be carried, as shown in Table 2.
Table 2 - Recommended ODUflex(GFP) bit rates and tolerance
ODU type | Nominal bit-rate | Tolerance
--------------------------------+------------------+-----------
ODUflex(GFP) of n TS, 1<=n<=8 | n * ODU2.ts | +/-100 ppm
ODUflex(GFP) of n TS, 9<=n<=32 | n * ODU3.ts | +/-100 ppm
ODUflex(GFP) of n TS, 33<=n<=80 | n * ODU4.ts | +/-100 ppm
According to this table, the Bit_Rate field for ODUflex(GFP) MUST
equal to one of the 80 values listed below:
1 * ODU2.ts; 2 * ODU2.ts; ...; 8 * ODU2.ts;
9 * ODU3.ts; 10 * ODU3.ts, ...; 32 * ODU3.ts;
33 * ODU4.ts; 34 * ODU4.ts; ...; 80 * ODU4.ts.
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In this way, the number of required tributary slots for the
ODUflex(GFP) (i.e., the value of "n" in Table 2) can be deduced from
the Bit_Rate field.
6. Generalized Label
This section defines the format of the OTN-TDM Generalized Label.
6.1. OTN-TDM Switching Type Generalized Label
The following is the Generalized Label format for that MUST be used
with the OTN-TDM Switching Type:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TPN | Reserved | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Bit Map ...... ~
~ ...... | Padding Bits ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The OTN-TDM Generalized Label is used to indicate how the LO ODUj
signal is multiplexed into the HO ODUk link. Note that the LO OUDj
signal type is indicated by traffic parameters, while the type of HO
ODUk link is identified by the selected interface carried in the
IF_ID RSVP_HOP Object.
TPN (12 bits): indicates the TPN for the assigned Tributary Slot(s).
- In case of LO ODUj multiplexed into HO ODU1/ODU2/ODU3, only the
lower 6 bits of TPN field are significant and the other bits of
TPN MUST be set to 0.
- In case of LO ODUj multiplexed into HO ODU4, only the lower 7
bits of TPN field are significant and the other bits of TPN
MUST be set to 0.
- In case of ODUj mapped into OTUk (j=k), the TPN is not needed
and this field MUST be set to 0.
Per [G709-2012], The TPN is used to allow for correct demultiplexing
in the data plane. When an LO ODUj is multiplexed into HO ODUk
occupying one or more TSs, a new TPN value is configured at the two
ends of the HO ODUk link and is put into the related MSI byte(s) in
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the OPUk overhead at the (traffic) ingress end of the link, so that
the other end of the link can learn which TS(s) is/are used by the LO
ODUj in the data plane.
According to [G709-2012], the TPN field MUST be set as according to
the following tables:
Table 3 - TPN Assignment Rules (2.5Gbps TS granularity)
+-------+-------+----+----------------------------------------------+
|HO ODUk|LO ODUj|TPN | TPN Assignment Rules |
+-------+-------+----+----------------------------------------------+
| ODU2 | ODU1 |1~4 |Fixed, = TS# occupied by ODU1 |
+-------+-------+----+----------------------------------------------+
| | ODU1 |1~16|Fixed, = TS# occupied by ODU1 |
| ODU3 +-------+----+----------------------------------------------+
| | ODU2 |1~4 |Flexible, != other existing LO ODU2s' TPNs |
+-------+-------+----+----------------------------------------------+
Table 4 - TPN Assignment Rules (1.25Gbps TS granularity)
+-------+-------+----+----------------------------------------------+
|HO ODUk|LO ODUj|TPN | TPN Assignment Rules |
+-------+-------+----+----------------------------------------------+
| ODU1 | ODU0 |1~2 |Fixed, = TS# occupied by ODU0 |
+-------+-------+----+----------------------------------------------+
| | ODU1 |1~4 |Flexible, != other existing LO ODU1s' TPNs |
| ODU2 +-------+----+----------------------------------------------+
| |ODU0 & |1~8 |Flexible, != other existing LO ODU0s and |
| |ODUflex| |ODUflexes' TPNs |
+-------+-------+----+----------------------------------------------+
| | ODU1 |1~16|Flexible, != other existing LO ODU1s' TPNs |
| +-------+----+----------------------------------------------+
| | ODU2 |1~4 |Flexible, != other existing LO ODU2s' TPNs |
| ODU3 +-------+----+----------------------------------------------+
| |ODU0 & | |Flexible, != other existing LO ODU0s and |
| |ODU2e &|1~32|ODU2es and ODUflexes' TPNs |
| |ODUflex| | |
+-------+-------+----+----------------------------------------------+
| ODU4 |Any ODU|1~80|Flexible, != ANY other existing LO ODUs' TPNs |
+-------+-------+----+----------------------------------------------+
Note that in the case of "Flexible", the value of TPN MAY not be
corresponding to the TS number as per [G709-2012].
Length (12 bits): indicates the number of bits of the Bit Map field,
i.e., the total number of TS in the HO ODUk link. The valid values
for this field are 0, 2, 4, 8, 16, 32 and 80.
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In case of an ODUk mapped into OTUk, there is no need to indicate
which tributary slots will be used, so the length field MUST be set
to 0.
Bit Map (variable): indicates which tributary slots in HO ODUk that
the LO ODUj will be multiplexed into. The sequence of the Bit Map is
consistent with the sequence of the tributary slots in HO ODUk. Each
bit in the bit map represents the corresponding tributary slot in HO
ODUk with a value of 1 or 0 indicating whether the tributary slot
will be used by LO ODUj or not.
Padding bits are added after the Bit Map to make the whole label a
multiple of four bytes if necessary. Padding bits MUST be set to 0
and MUST be ignored.
6.2. Procedures
When a node receives a generalized label request for setting up an
ODUj LSP from its upstream neighbor node, the node MUST generate an
OTN-TDM label according to the signal type of the requested LSP and
the free resources (i.e., free tributary slots of ODUk) that will be
reserved for the LSP, and send the label to its upstream neighbor
node.
In case of ODUj to ODUk multiplexing, the node MUST firstly determine
the size of the Bit Map field according to the signal type and the
tributary slot type of ODUk, and then set the bits to 1 in the Bit
Map field corresponding to the reserved tributary slots. The node
MUST also assign a valid TPN, which MUST NOT collide with other TPN
value used by existing LO ODU connections in the selected HO ODU
link, and configure the Expected MSI (ExMSI) using this TPN. Then,
the assigned TPN MUST be filled into the label.
In case of ODUk to OTUk mapping, TPN field MUST be set to 0. Bit Map
information is not REQUIRED and MUST NOT be included, so Length field
MUST be set to 0 as well.
The node receiving a OTN-TDM generalized label MUST firstly identify
which ODU signal type is multiplexed or mapped into which ODU signal
type accordingly to the traffic parameters and the IF_ID RSVP_HOP
Object in the received message.
In case of ODUj to ODUk multiplexing, the node MUST retrieve the
reserved tributary slots in the ODUk by its downstream neighbor node
according to the position of the bits that are set to 1 in the Bit
Map field. The node determines the TS type (according to the total TS
number of the ODUk, or pre-configured TS type), so that the node,
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based on the TS type, can multiplex the ODUj into the ODUk. The node
MUST also retrieve the TPN value assigned by its downstream neighbor
node from the label, and fill the TPN into the related MSI byte(s) in
the OPUk overhead in the data plane, so that the downstream neighbor
node can check whether the TPN received from the data plane is
consistent with the ExMSI and determine whether there is any mismatch
defect.
Note that the Length field in the label format MAY be used to
indicate the TS type of the HO ODUk (i.e., TS granularity at 1.25Gbps
or 2.5Gbps) since the HO ODUk type can be known from IF_ID RSVP_HOP
Object. In some cases when there is no Link Management Protocol (LMP)
or routing to make the two end points of the link to know the TSG,
the TSG information used by another end can be deduced from the label
format. For example, for HO ODU2 link, the value of the length filed
will be 4 or 8, which indicates the TS granularity is 2.5Gbps or
1.25Gbps, respectively.
In case of ODUk to OTUk mapping, the size of Bit Map field MUST be 0
and no additional procedure is needed.
In order to create bidirectional LSP, an upstream node MUST generate
an Upstream Label on the out outgoing interface to indicate the
reserved TSs of ODUk and the assigned TPN value in the upstream
direction. This Upstream Label is sent to the downstream node via
Path massage for upstream resource reservation.
The upstream node MAY generate Label Set to indicate which labels on
the outgoing interface in the downstream direction are acceptable.
The downstream node will restrict its choice of labels, i.e., TS
resource and TPN value, to one which is in the Label Set.
The upstream node MAY also generate Suggested Label to indicate the
preference of TS resource and TPN value on the outgoing interface in
the downstream direction. The downstream node is not REQUIRED to use
the Suggested Label and MAY use another label based on local decision
and send it to the upstream node, as described in [RFC3473].
The ingress node of an LSP MAY include label ERO to indicate the
label in each hops along the path. Note that the TPN in the label ERO
(Explicit Route Object) subobject MAY not be assigned by the ingress
node. In this case, the node MUST assign a valid TPN value and then
put this value into TPN field of the label object when receiving a
Path message.
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6.2.1. Notification on Label Error
When receiving an OTN-TDM label from the neighbor node, the node MUST
check whether the label is acceptable. An error message containing an
"Unacceptable label value" indication ([RFC3209]) MUST be sent if one
of the following cases occurs:
- Invalid value in the length field;
- The selected link only supports 2.5Gbps TS granularity while the
Length field in the label along with ODUk signal type indicates
the 1.25Gbps TS granularity;
- The label includes an invalid TPN value that breaks the TPN
assignment rules;
- The indicated resources (i.e., the number of "1" in the Bit Map
field) are inconsistent with the Traffic Parameters.
6.3. Supporting Virtual Concatenation and Multiplication
Per [RFC6344], the Virtual Concatenation Groups (VCGs) can be created
using Co-Signaled style or Multiple LSPs style.
In case of Co-Signaled style, the explicit ordered list of all labels
MUST reflect the order of VCG members, which is similar to [RFC4328].
In case of multiplexed virtually concatenated signals (NVC > 1), the
first label MUST indicate the components of the first virtually
concatenated signal; the second label MUST indicate the components of
the second virtually concatenated signal; and so on. In case of
multiplication of multiplexed virtually concatenated signals (MT >
1), the first label MUST indicate the components of the first
multiplexed virtually concatenated signal; the second label MUST
indicate components of the second multiplexed virtually concatenated
signal; and so on.
In case of Multiple LSPs style, multiple control plane LSPs are
created with a single VCG and the VCAT Call SHOULD be used to
associate the control plane LSPs. The procedures are similar to
section 6 of [RFC6344].
6.4. Examples
The following examples are given in order to illustrate the label
format described in Section 5.1 of this document.
(1) ODUk into OTUk mapping:
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In such conditions, the downstream node along an LSP returns a label
indicating that the ODUk (k=1, 2, 3, 4) is directly mapped into the
corresponding OTUk. The following example label indicates an ODU1
mapped into OTU1.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TPN = 0 | Reserved | Length = 0 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
(2) ODUj into ODUk multiplexing:
In such conditions, this label indicates that an ODUj is multiplexed
into several tributary slots of OPUk and then mapped into OTUk. Some
instances are shown as follow:
- ODU0 into ODU2 Multiplexing:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TPN = 2 | Reserved | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 1 0 0 0 0 0 0| Padded Bits (0) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
This above label indicates an ODU0 multiplexed into the second
tributary slot of ODU2, wherein there are 8 TS in ODU2 (i.e., the
type of the tributary slot is 1.25Gbps), and the TPN value is 2.
- ODU1 into ODU2 Multiplexing with 1.25Gbps TS granularity:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TPN = 1 | Reserved | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 1 0 1 0 0 0 0| Padded Bits (0) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
This above label indicates an ODU1 multiplexed into the 2nd and the
4th tributary slot of ODU2, wherein there are 8 TS in ODU2 (i.e., the
type of the tributary slot is 1.25Gbps), and the TPN value is 1.
- ODU2 into ODU3 Multiplexing with 2.5Gbps TS granularity:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TPN = 1 | Reserved | Length = 16 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 1 1 0 1 0 1 0 0 0 0 0 0 0 0 0| Padded Bits (0) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
This above label indicates an ODU2 multiplexed into the 2nd, 3rd, 5th
and 7th tributary slot of ODU3, wherein there are 16 TS in ODU3
(i.e., the type of the tributary slot is 2.5Gbps), and the TPN value
is 1.
7. Supporting Hitless Adjustment of ODUflex (GFP)
[G7044] describes the procedure of ODUflex (GFP) hitless resizing
using Link Connection Resize (LCR) and Bandwidth Resize (BWR)
protocols in OTN data plane.
For the control plane, signaling messages are REQUIRED to initiate
the adjustment procedure. Section 2.5 and Section 4.6.4 of [RFC3209]
describe how the Shared Explicit (SE) style is used in Traffic
Engineering (TE) network for bandwidth increasing and decreasing,
which is still applicable for triggering the ODUflex (GFP) adjustment
procedure in data plane.
Note that the SE style MUST be used at the beginning when creating a
resizable ODUflex connection (Signal Type = 21). Otherwise an error
with Error Code "Conflicting reservation style" MUST be generated
when performing bandwidth adjustment.
- Bandwidth increasing
In order to increase the bandwidth of an ODUflex (GFP)
connection, a Path message with SE style (keeping Tunnel ID
unchanged and assigning a new LSP ID) MUST be sent along the
path.
A downstream node compares the old Traffic Parameters (stored
locally) with the new one carried in the Path message, to
determine the number of TS to be added. After choosing and
reserving new free TS, the downstream node MUST send back a Resv
message carrying both the old and new LABEL Objects in the SE
flow descriptor, so that its upstream neighbor can determine
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which TS are added. And the LCR protocol between each pair of
neighbor nodes MUST be triggered.
On the source node, the BWR protocol will be triggered by the
successful completion of LCR protocols on every hop after Resv
message is processed. On success of BWR, the source node MUST
send a PathTear message to delete the old control state (i.e.,
the control state of the ODUflex (GFP) before resizing) on the
control plane.
- Bandwidth decreasing
The SE style SHOULD also be used for ODUflex bandwidth
decreasing. For each pair of neighbor nodes, the sending and
receiving Resv message with old and new LABEL Objects will
trigger the first step of LCR between them to perform LCR
handshake. On the source node, the BWR protocol will be triggered
by the successful completion of LCR handshake on every hop after
Resv message is processed. On success of BWR, the second step of
LCR, i.e., link connection decrease procedure will be started on
every hop of the connection.
Similarly, after completion of bandwidth decreasing, a ResvErr
message SHOULD be sent to tear down the old control state.
8. Control Plane Backward Compatibility Considerations
As described in [OTN-FWK], since the [RFC4328] has been deployed in
the network for the nodes that support the 2001 revision of the G.709
specification, control plane backward compatibility SHOULD be taken
into consideration. More specifically:
o Nodes supporting this document SHOULD support [OTN-OSPF].
o Nodes supporting this document MAY support [RFC4328] signaling.
o A node supporting both sets of procedures (i.e., [RFC4328] and
this document) is not REQUIRED to signal an LSP using both
procedures, i.e., to act as a signaling version translator.
o Ingress nodes that support both sets of procedures MAY select
which set of procedures to follow based on routing information or
local policy.
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o Per [RFC3473], nodes that do not support this document will
generate a PathErr message, with a "Routing problem/Switching
Type" indication.
9. Security Considerations
This document introduces no new security considerations to the
existing GMPLS signaling protocols. Referring to [RFC3473] and
[RFC4328], further details of the specific security measures are
provided. Additionally, [RFC5920] provides an overview of security
vulnerabilities and protection mechanisms for the GMPLS control
plane.
10. IANA Considerations
Three RSVP C-Types are defined for OTN-TDM Traffic Parameters and
OTN-TDM Generalized Label in this document.
- OTN-TDM SENDER_TSPEC and FLOWSPEC objects:
o OTN-TDM SENDER_TSPEC Object: Class = 12, C-Type = 7 (see
Section 4)
o OTN-TDM FLOWSPEC Object: Class = 9, C-Type = 7 (see Section 4)
- OTN-TDM Generalized Label Object:
o OTN-TDM Generalized Label Object: Class = 16, C-Type = 2 (see
Section 5.1)
IANA will also track the code-point spaces extended and/or updated by
this document. The Generalized PID has been added in the newly
requested registry entry:
- Generalized PID (G-PID):
Name: G-PID
Format: 16-bit number
Values:
[0..31, 36..46] defined in [RFC3471]
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[32] defined in [RFC3471] and updated by Section 3
[33..35] defined in [RFC3471] and updated by [RFC4328]
[47, 49..52] defined in [RFC4328] and updated by Section 3
[48, 53..58] defined in [RFC4328]
[59..63] defined in Section 3
Allocation Policy (as defined in [RFC4328]):
[0..31743] Assigned by IANA via IETF Standards Track RFC
Action.
[31744..32767] Assigned temporarily for Experimental Usage
[32768..65535] Not assigned. Before any assignments can be
made in this range, there MUST be a Standards
Track RFC that specifies IANA Considerations
that covers the range being assigned.
11. References
11.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3209] D. Awduche et al, "RSVP-TE: Extensions to RSVP for LSP
Tunnels", RFC3209, December 2001.
[RFC3471] Berger, L., Editor, "Generalized Multi-Protocol Label
Switching (GMPLS) Signaling Functional Description", RFC
3471, January 2003.
[RFC3473] L. Berger, Ed., "Generalized Multi-Protocol Label Switching
(GMPLS) Signaling Resource ReserVation Protocol-Traffic
Engineering (RSVP-TE) Extensions", RFC 3473, January 2003.
[RFC4328] D. Papadimitriou, Ed. "Generalized Multi-Protocol Label
Switching (GMPLS) Signaling Extensions for G.709 Optical
Transport Networks Control", RFC 4328, Jan 2006.
[RFC6344] G. Bernstein et al, "Operating Virtual Concatenation (VCAT)
and the Link Capacity Adjustment Scheme (LCAS) with
Generalized Multi-Protocol Label Switching (GMPLS)",
RFC6344, August 2011.
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11.2. Informative References
[OTN-FWK] Fatai Zhang et al, "Framework for GMPLS and PCE Control of
G.709 Optical Transport Networks", Work in Progress: draft-
ietf-ccamp-gmpls-g709-framework, November 2012.
[OTN-INFO] S. Belotti et al, "Information model for G.709 Optical
Transport Networks (OTN)", Work in Progress: draft-ietf-
ccamp-otn-g709-info-model, November 2012.
[OTN-OSPF] D. Ceccarelli et al, "Traffic Engineering Extensions to
OSPF for Generalized MPLS (GMPLS) Control of Evolving G.709
OTN Networks", Work in Progress: draft-ietf-ccamp-gmpls-
ospf-g709v3, November 2012.
[G709-2012] ITU-T, "Interfaces for the Optical Transport Network
(OTN)", G.709/Y.1331 Recommendation, February 2012.
[G7044] ITU-T, "Hitless adjustment of ODUflex", G.7044/Y.1347,
October 2011.
[RFC4506] M. Eisler, Ed., "XDR: External Data Representation
Standard", RFC 4506, May 2006.
[RFC5920] Fang, L., Ed., "Security Framework for MPLS and GMPLS
Networks", RFC5920, July 2010.
[IEEE] "IEEE Standard for Binary Floating-Point Arithmetic",
ANSI/IEEE Standard 754-1985, Institute of Electrical and
Electronics Engineers, August 1985.
12. Contributors
Jonathan Sadler, Tellabs
Email: jonathan.sadler@tellabs.com
Kam LAM, Alcatel-Lucent
Email: kam.lam@alcatel-lucent.com
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Xiaobing Zi, Huawei Technologies
Email: zixiaobing@huawei.com
Francesco Fondelli, Ericsson
Email: francesco.fondelli@ericsson.com
Lyndon Ong, Ciena
Email: lyong@ciena.com
Biao Lu, infinera
Email: blu@infinera.com
13. Authors' Addresses
Fatai Zhang (editor)
Huawei Technologies
F3-5-B R&D Center, Huawei Base
Bantian, Longgang District
Shenzhen 518129 P.R.China
Phone: +86-755-28972912
Email: zhangfatai@huawei.com
Guoying Zhang
China Academy of Telecommunication Research of MII
11 Yue Tan Nan Jie Beijing, P.R.China
Phone: +86-10-68094272
Email: zhangguoying@mail.ritt.com.cn
Sergio Belotti
Alcatel-Lucent
Optics CTO
Via Trento 30 20059 Vimercate (Milano) Italy
+39 039 6863033
Email: sergio.belotti@alcatel-lucent.it
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Daniele Ceccarelli
Ericsson
Via A. Negrone 1/A
Genova - Sestri Ponente
Italy
Email: daniele.ceccarelli@ericsson.com
Khuzema Pithewan
Infinera Corporation
169, Java Drive
Sunnyvale, CA-94089, USA
Email: kpithewan@infinera.com
Yi Lin
Huawei Technologies
F3-5-B R&D Center, Huawei Base
Bantian, Longgang District
Shenzhen 518129 P.R.China
Phone: +86-755-28972914
Email: yi.lin@huawei.com
Yunbin Xu
China Academy of Telecommunication Research of MII
11 Yue Tan Nan Jie Beijing, P.R.China
Phone: +86-10-68094134
Email: xuyunbin@mail.ritt.com.cn
Pietro Grandi
Alcatel-Lucent
Optics CTO
Via Trento 30 20059 Vimercate (Milano) Italy
+39 039 6864930
Email: pietro_vittorio.grandi@alcatel-lucent.it
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Diego Caviglia
Ericsson
Via A. Negrone 1/A
Genova - Sestri Ponente
Italy
Email: diego.caviglia@ericsson.com
Rajan Rao
Infinera Corporation
169, Java Drive
Sunnyvale, CA-94089
USA
Email: rrao@infinera.com
John E Drake
Juniper
Email: jdrake@juniper.net
Igor Bryskin
Adva Optical
EMail: IBryskin@advaoptical.com
14. Acknowledgment
The authors would like to thank Lou Berger and Deborah Brungard for
their useful comments to the document.
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