IDR Weiguo Hao
Qiandeng Liang
Shunwan Zhuang
Internet Draft Huawei
Jim Uttaro
AT&T
S. Litkowski
Orange Business Service
Intended status: Standards Track September 19, 2014
Expires: March 2015
Dissemination of Flow Specification Rules for L2 VPN
draft-hao-idr-flowspec-evpn-01.txt
Abstract
This document defines BGP flow-spec extension for Ethernet traffic
filtering in L2 VPN network. A new BGP NLRI type (AFI=25, SAFI=TBD)
value is proposed to identify L2 VPN flow-spec application. A new
subset of component types and extended community also are defined.
Status of this Memo
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Table of Contents
1. Introduction ................................................ 2
2. Ethernet Flow Specification encoding in BGP.................. 3
3. Ethernet Flow Specification Traffic Actions.................. 5
4. Security Considerations...................................... 5
5. IANA Considerations ......................................... 6
5.1. Normative References.................................... 6
5.2. Informative References.................................. 7
6. Acknowledgments ............................................. 7
1. Introduction
BGP Flow-spec is an extension to BGP that allows for the
dissemination of traffic flow specification rules. It leverages the
BGP Control Plane to simplify the distribution of ACLs, new filter
rules can be injected to all BGP peers simultaneously without
changing router configuration. The typical application of BGP Flow-
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spec is to automate the distribution of traffic filter lists to
routers for DDOS mitigation.
RFC5575 defines a new BGP Network Layer Reachability Information
(NLRI) format used to distribute traffic flow specification rules.
NLRI (AFI=1, SAFI=133)is for IPv4 unicast filtering. NLRI (AFI=1,
SAFI=134)is for BGP/MPLS VPN filtering. The Flow specification match
part only includes L3/L4 information like source/destination prefix,
protocol, ports, and etc, so traffic flows can only be selectively
filtered based on L3/L4 information.
Layer 2 Virtual Private Networks L2VPNs have already been deployed
in an increasing number of networks today. In L2VPN network, we also
have requirement to deploy BGP Flow-spec to mitigate DDoS attack
traffic. Within L2VPN network, both IP and non-IP Ethernet traffic
maybe exist. For IP traffic filtering, the Flow specification rules
defined in [RFC5575] which include match criteria and actions can
still be used, flow specification rules received via new NLRI format
apply only to traffic that belongs to the VPN instance(s) in which
it is imported. For non-IP Ethernet traffic filtering, Layer 2
related information like source/destination MAC and VLAN should be
considered. But the flow specification match criteria defined in
RFC5575 only include layer 3 and layer 4 IP information, layer 2
Ethernet information haven't been included.
There are different kinds of L2VPN networks like EVPN [EVPN], BGP
VPLS [RFC4761], LDP VPLS [RFC4762] and border gateway protocol (BGP)
auto discovery [RFC 6074]. Because the flow-spec feature relies on
BGP protocol to distribute traffic filtering rules, so it can only
be incrementally deployed in those L2VPN networks where BGP is used
for auto discovery and/or signaling purposes such as BGP-based VPLS
[4761], EVPN and LDP-based VPLS [4762] with BGP auto-discovery
[6074].
This document proposes a new BGP NLRI type (AFI=25, SAFI=TBD) value,
which can be used to propagate traffic filtering information in an
L2VPN environment. The new specific (AFI, SAFI) pair is to identify
L2VPN flow-spec application. A new subset of component types and
extended community also are defined.
2. Ethernet Flow Specification encoding in BGP
A new BGP NLRI type (AFI=25, SAFI=TBD) value is proposed to identify
L2VPN flow-spec application.
The NLRI format for this address family consists of a fixed-length
Route Distinguisher field (8 bytes) followed by a flow specification,
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following the encoding defined in this document. The NLRI length
field shall include both the 8 bytes of the Route Distinguisher as
well as the subsequent flow specification.
Flow specification rules received via this NLRI apply only to
traffic that belongs to the VPN instance(s) in which it is imported.
Flow rules are accepted by default, when received from remote PE
routers.
Besides the component types defined in [RFC5575], this document
proposes the following additional component types for L2VPN Ethernet
traffic filtering:
Type 13 - Source MAC
Encoding: <type (1 octet), [op, value]+>
Defines a list of {operation, value} pairs used to match source MAC.
Values are encoded as 6-byte quantities.
Type 14 - Destination MAC
Encoding: <type (1 octet), [op, value]+>
Defines a list of {operation, value} pairs used to match destination
MAC. Values are encoded as 6-byte quantities.
Type 15 - Ethernet Type
Encoding: <type (1 octet), [op, value]+>
Defines a list of {operation, value} pairs used to match two-octet
field. Values are encoded as 1- or 2-byte quantities.
Type 16 - VLAN ID
Encoding: <type (1 octet), [op, value]+>
Defines a list of {operation, value} pairs used to match VLAN ID.
Values are encoded as 1- or 2-byte quantities.
Type 17 - VLAN COS
Encoding: <type (1 octet), [op, value]+>
Defines a list of {operation, value} pairs used to match 3-bit VLAN
COS fields [802.1p]. Values are encoded using a single byte, where
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the five most significant bits are zero and the three least
significant bits contain the VLAN COS value.
Type 18 - VN ID
Encoding: <type (1 octet), [op, value]+>
Defines a list of {operation, value} pairs used to match 24-bit VNID
fields. Values are encoded as 1- to 3-byte quantities.
In [EVPN-OVERLAY], EVPN can be deployed within a data center using
layer 2 overlays like VXLAN, NVGRE, and etc. VN ID is tenant
identification in NVO3 network.
3. Ethernet Flow Specification Traffic Actions
+--------+--------------------+--------------------------+
| type | extended community | encoding |
+--------+--------------------+--------------------------+
| 0x8006 | traffic-rate | 2-byte as#, 4-byte float |
| 0x8007 | traffic-action | bitmask |
| 0x8008 | redirect | 6-byte Route Target |
| 0x8009 | traffic-marking | DSCP value |
+--------+--------------------+--------------------------+
Besides to support the above extended communities per RFC5575, this
document also proposes the following BGP extended communities
specifications for Ethernet flow to extend [RFC5575]:
+--------+--------------------+--------------------------+
| type | extended community | encoding |
+--------+--------------------+--------------------------+
| 0x800A | VLAN COS marking | COS value |
+--------+--------------------+--------------------------+
The VLAN COS marking extended community instructs a system to modify
the COS bits of a transiting Ethernet packet to the corresponding
value. This extended community is encoded as a sequence of 5 zero
bytes followed by the VLAN COS value encoded in the 3 least
significant bits of 6th byte.
4. Security Considerations
No new security issues are introduced to the BGP protocol by this
specification.
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5. IANA Considerations
IANA is requested to allocate a new SAFI to identify EVPN flow-spec
application.
IANA is requested to create and maintain a new registry entitled:
"Flow spec L2VPN Component Types":
Type 13 - Source MAC
Type 14 - Destination MAC
Type 15 - Ethernet Type
Type 16 - VLAN ID
Type 17 - VLAN COS
IANA is requested to update the reference for the following
assignment in the "BGP Extended Communities Type - extended,
transitive" registry:
Type value Name Reference
---------- ---------------------------------------- ---------
0x080A Flow spec VLAN COS marking [this document]
5.1. Normative References
[1] [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[2] [RFC5575] P. Marques, N. Sheth, R. Raszuk, B. Greene, J.Mauch,
D. McPherson, "Dissemination of Flow Specification Rules", RFC
5575, August 2009.
[3] [RFC4761] K. Kompella, Ed., Y. Rekhter, Ed., "Virtual Private
LAN Service (VPLS) Using BGP for Auto-Discovery and Signaling",
RFC4761, January 2007.
[4] [RFC4762] M. Lasserre, Ed., V. Kompella, Ed., "Virtual Private
LAN Service (VPLS) Using Label Distribution Protocol (LDP)
Signaling", RFC4762, January 2007.
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[5] [RFC6074] E. Rosen, B. Davie, V. Radoaca, "Provisioning, Auto-
Discovery, and Signaling in Layer 2 Virtual Private Networks
(L2VPNs)", RFC6074, January 2011.
5.2. Informative References
[1] [EVPN] Sajassi et al., "BGP MPLS Based Ethernet VPN", draft-
ietf-l2vpn-evpn-07.txt, work in progress, May, 2014.
[2] [EVPN-OVERLAY] A. Sajassi,etc, ''A Network Virtualization
Overlay Solution using EVPN'', draft-sd-l2vpn-evpn-overlay-03,
June, 2014
[3] [IEEE 802.1p] Javin, et.al. "IEEE 802.1p: LAN Layer 2 QoS/CoS
Protocol for Traffic Prioritization", 2012-02-15
6. Acknowledgments
The authors wish to acknowledge the important contributions of
Xiaohu Xu, Lucy Yong.
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Authors' Addresses
Weiguo Hao
Huawei Technologies
101 Software Avenue,
Nanjing 210012
China
Email: haoweiguo@huawei.com
Qiandeng Liang
Huawei Technologies
101 Software Avenue,
Nanjing 210012
China
Email: liuweihang@huawei.com
Shunwan Zhuang
Huawei Technologies
Huawei Bld., No.156 Beiqing Rd.
Beijing 100095
China
Email: zhuangshunwan@huawei.com
James Uttaro
AT&T
EMail: uttaro@att.com
Stephane Litkowski
Orange
stephane.litkowski@orange.com
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