Network Working Group B. Liu
Internet-Draft S. Jiang
Intended status: Standards Track Huawei Technologies
Expires: November 27, 2017 May 26, 2017
Information Distribution over GRASP
draft-liu-anima-grasp-distribution-04
Abstract
This document discusses the requirement of information distribution
capability in autonomic networks. Ideally, the autonomic network
should support distributing some information which is generated/
injected at an arbitrary autonomic node and be distributed among the
whole autonomic domain. This docuemnt specifically proposes to
achive this goal based on the GRASP (A Generic Autonomic Signaling
Protocol), and specifies additional node behavior.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Information Distribution Scenarios . . . . . . . . . . . . . 3
2.1. Whole Domain Distribution . . . . . . . . . . . . . . . . 3
2.2. Selective Distribution . . . . . . . . . . . . . . . . . 3
2.3. Incremental Distribution . . . . . . . . . . . . . . . . 3
3. Distribution Requirements . . . . . . . . . . . . . . . . . . 3
3.1. Identifying Autonomic Domain Boundary . . . . . . . . . . 3
3.2. Arbitrary Injecting Point . . . . . . . . . . . . . . . . 4
3.3. Avoiding Loops . . . . . . . . . . . . . . . . . . . . . 4
3.4. Selective Flooding . . . . . . . . . . . . . . . . . . . 4
3.5. Point-to-Point Distribution . . . . . . . . . . . . . . . 4
3.6. Verification of Distributed Information . . . . . . . . . 4
3.7. Conflict Handling . . . . . . . . . . . . . . . . . . . . 4
4. Distribution Function and Behavior Specification . . . . . . 5
4.1. Using GRASP Flood Synchronization Message . . . . . . . . 5
4.2. Using GRASP Synchronization Message . . . . . . . . . . . 5
4.3. Selective Flooding . . . . . . . . . . . . . . . . . . . 5
4.3.1. Selecting Cretiria . . . . . . . . . . . . . . . . . 5
4.3.2. Node Behavior . . . . . . . . . . . . . . . . . . . . 6
4.4. Conflict Handling . . . . . . . . . . . . . . . . . . . . 6
4.5. Distribution Source Authentication . . . . . . . . . . . 6
5. Security Considerations . . . . . . . . . . . . . . . . . . . 6
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 7
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 7
8.1. Normative References . . . . . . . . . . . . . . . . . . 7
8.2. Informative References . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
In an autonomic network, sometimes the nodes need to share a set of
common information. One typical case is the Intent Distribution
which is briefly discussed in Section 4.5 of
[I-D.behringer-anima-reference-model]. However, the distribution
should be a general function that one autonomic node should support,
rather than a specific mechanism dedicated for Intent. This document
firstly analyzes several basic information distribution scenarios
(Section 2), and then discusses the technical requirements
(Section 3) that one autonomic node needs to fulfill.
This document proposes to achieve distribution function based on the
GRASP (A Generic Autonomic Signaling Protocol) [I-D.ietf-anima-grasp]
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. GRASP already provides some capability to support part of the
distribution function. Along with that, this document also proposes
some additional functionality. Detailed design is described in
Section 4.
2. Information Distribution Scenarios
2.1. Whole Domain Distribution
Once the information is input to the autonomic network, the node that
firstly handle the information MUST be able to distribute it to all
the other nodes in the autonomic domain.
The distributed information might not relevant to every autonomic
node, but it is flooded to all the devices.
2.2. Selective Distribution
When one node receive the information, it only replicates it to the
neighbors that fit for a certain of conditions. This could reduce
some unnecessary signaling amplification.
However, this scenario implies there needs to be corresponding
mechanisms to represent the conditions and to judge which neighbors
fit for the conditions. Please refer to Section 4.3.2 (selective
flooding behavior).
2.3. Incremental Distribution
The distribution only goes to the nodes that newly get online. This
might mostly happen between neighbors.
The incremental distribution could also be a sub scenario of the
whole domain distribution. When one node is doing the whole domain
distribution, it is possible that some of its neighbors are sleeping/
off-line, so when the neighbors get online again, the node should do
incremental distribution of the previous whole domain distributed
information.
3. Distribution Requirements
3.1. Identifying Autonomic Domain Boundary
The domain boundary devices are supposed to know themselves as
boundary. When the distribution messages come to the devices, they
do not distribute them outside the domain.
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3.2. Arbitrary Injecting Point
The distributed information SHOULD be injected at any autonomic node
within the domain (or within a specific set of nodes [TBD]).
3.3. Avoiding Loops
There should be a mechanism to prevent the distributed information to
travel around the domain again and again, so that there would not be
a large amount of redundant packets troubling the network.
3.4. Selective Flooding
When one node receive the information, it only floods it to the
neighbors that fit for a certain of rules.
3.5. Point-to-Point Distribution
One node only distributes the information to another node. This is
for the incremental distribution scenario.
3.6. Verification of Distributed Information
o Information integrity verification
The receiving node SHOULD be able to verify whether the
distributed information is from the certain node. In other
words, it needs to make sure the information hasn't been
modified.
o Source authorization verification
Even the information integrity was verified, the distributed
information might still be invalid, since the distribution
source might not have the right to distribute such information
that it just exceeds its authority.
3.7. Conflict Handling
As long as it supports arbitrary point of injecting distribution,
there is possibility that two nodes advertise the same information
but with conflict attribute(s). Hence, there should be a mechanism
to handle the conflict.
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4. Distribution Function and Behavior Specification
This section specifies using certain GRASP messages for distribution,
and also specifies the distribution behavior in an autonomic node.
4.1. Using GRASP Flood Synchronization Message
It is natural to use the GRASP Flood Synchronization message for
distribution, since the Flood Synchronization behavior specified in
GRASP is identical to the the whole domain distribution scenario
described in Section 2.1. And the Flood Synchronization naturally
fits for "Arbitrary Injection Point" and "Avoiding Loops"
requirements.
4.2. Using GRASP Synchronization Message
It is natural to use the GRASP Synchronization message for Point-to-
Point distribution. The two behavior is identical.
4.3. Selective Flooding
4.3.1. Selecting Cretiria
When doing selective flooding, the distributed information needs to
contain the cretiria for nodes to judge which interfaces should be
sent the distributed information and which are not. Specifically,
the cretiria contains:
o Matching condition: a set of matching rules.
o Matching object: the object that the match condition would be
applied to. For example, the matching object could be node itself
or its neighbors.
o Action: what behavior the node needs to do when the matching
object matches or failed the matching condition. For example, the
action could be forwarding or discarding the distributed message.
Example:
o Matching condition: "Device role=IPRAN_RSG"
o Matching objective: "Neighbors"
o Action: "Forward"
This example means: only distributing the information to the
neighbors who are IPRAN_RSG.
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4.3.2. Node Behavior
1) The distribution initial node Includes the Selecting Cretiria
information in the message that carries the distributed information.
2) The recieving node decides the action according to the Selecting
Cretiria carried in the message.
2-1 When the Matching Object is "Neighbors", then the node matches
the relevant information of its neighbors to the Matching
Condition. If the node finds one neighbor matches the Matching
Condition, then it forwards the distributed messge to the
neighbor. If not, the node discards forwarding the message to the
neighbor.
2-2 When the Matching Object is the node itself, then the node
matches the relevant information of its own to the Matching
Condition. If the node finds itself matches the Matching
Condition, then it forwards the distributed messge to its
neighbors; if not, the node discards forwarding the message to the
neighbors.
4.4. Conflict Handling
The distribution information needs to include timestamps or version
information. When conflict happens, the node only accepts the latest
information.
4.5. Distribution Source Authentication
The distribution source authentication could be done at multiple
layers:
o Outer layer authentication: the GRASP communication is within ACP
(Autonomic Control Plane,
[I-D.behringer-anima-autonomic-control-plane] ). This is the
default GRASP behavior.
o Inner layer authentication: the GRASP communication might not be
within a protected channel, then there should be embedded
protection in distribution information itself. Public key
infrastructure might be involved in this case.
5. Security Considerations
TBD.
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6. IANA Considerations
No IANA assignment is needed.
7. Acknowledgements
This document is inherited from [I-D.ietf-anima-grasp] and
[I-D.behringer-anima-reference-model]. So thanks all the
contributors of the two work items.
This document was produced using the xml2rfc tool [RFC2629].
8. References
8.1. Normative References
[I-D.ietf-anima-grasp]
Bormann, C., Carpenter, B., and B. Liu, "A Generic
Autonomic Signaling Protocol (GRASP)", draft-ietf-anima-
grasp-12 (work in progress), May 2017.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>.
[RFC2629] Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629,
DOI 10.17487/RFC2629, June 1999,
<http://www.rfc-editor.org/info/rfc2629>.
8.2. Informative References
[I-D.behringer-anima-autonomic-control-plane]
Behringer, M., Bjarnason, S., BL, B., and T. Eckert, "An
Autonomic Control Plane", draft-behringer-anima-autonomic-
control-plane-03 (work in progress), June 2015.
[I-D.behringer-anima-reference-model]
Behringer, M., Carpenter, B., Eckert, T., Ciavaglia, L.,
Liu, B., Jeff, J., and J. Strassner, "A Reference Model
for Autonomic Networking", draft-behringer-anima-
reference-model-04 (work in progress), October 2015.
[I-D.du-anima-an-intent]
Du, Z., Jiang, S., Nobre, J., Ciavaglia, L., and M.
Behringer, "ANIMA Intent Policy and Format", draft-du-
anima-an-intent-05 (work in progress), February 2017.
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[I-D.irtf-nmrg-autonomic-network-definitions]
Behringer, M., Pritikin, M., Bjarnason, S., Clemm, A.,
Carpenter, B., Jiang, S., and L. Ciavaglia, "Autonomic
Networking - Definitions and Design Goals", draft-irtf-
nmrg-autonomic-network-definitions-07 (work in progress),
March 2015.
[I-D.pritikin-anima-bootstrapping-keyinfra]
Pritikin, M., Richardson, M., Behringer, M., and S.
Bjarnason, "Bootstrapping Key Infrastructures", draft-
pritikin-anima-bootstrapping-keyinfra-02 (work in
progress), July 2015.
Authors' Addresses
Bing Liu
Huawei Technologies
Q14, Huawei Campus
No.156 Beiqing Road
Hai-Dian District, Beijing 100095
P.R. China
Email: leo.liubing@huawei.com
Sheng Jiang
Huawei Technologies
Q14, Huawei Campus
No.156 Beiqing Road
Hai-Dian District, Beijing 100095
P.R. China
Email: jiangsheng@huawei.com
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