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Proxy Remote LSP Ping <draft-swallow-mpls-remote-lsp-ping-00.txt>. IETF-67 [email protected] Proxy Ping Motivation. Scalability Control number of replies network wide processing of MPLS Echo Requests

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Proxy remote lsp ping draft swallow mpls remote lsp ping 00 txt

Proxy Remote LSP Ping<draft-swallow-mpls-remote-lsp-ping-00.txt>

IETF-67

[email protected]


Proxy ping motivation
Proxy Ping Motivation

  • Scalability

    • Control

      • number of replies

      • network wide processing of MPLS Echo Requests

    • Scoping can limit the number of replies but still requires processing at the ‘replying’ node

    • In some cases, scoping is not desired, but responses are only needed from a small region of the topology

  • mLDP support

    • Trace from leaf to route

    • Previous Hop Information


Mcast lsp trace
Mcast LSP Trace

Responding Nodes

This pass:

Total:

5

14

7

21

9

30

2

2

3

5

4

9


Proxy lsp ping
Proxy LSP Ping

  • Proxy Echo Request

    • Out of band message to a node on the multicast tree

    • Requests node to insert an inband MPLS Echo Request

    • Optionally asks for a Proxy Echo Reply

  • Proxy Echo Reply

    • Verifies that FEC was valid and that the Echo Reply will be/was sent

    • Supplies PHOP information (if requested)


Proxy lsp ping1
Proxy LSP Ping

Proxy Echo Request

Echo Request


Acknowledgement phop
Acknowledgement & PHOP

Proxy Echo Request

Proxy Echo Reply

Echo Request

Replies Supressed


P2mp te tracing
P2MP-TE Tracing

  • Root node usually knows the tree topology

  • Suppose a few nodes are failing in a very large tree

  • Fault is likely to be close to those nodes

  • Proxy Echo Request allows traceroute to proceed in reverse

  • Greatly limits the number of nodes replying


P2mp te
P2MP-TE

Proxy Echo Request

Echo Request

Note: Echo Replies not shown


Next hop scoping
Next-Hop Scoping

  • Requester

    • Adds the next-hop IP address to the Proxy Echo Parameters Object

    • Sends Proxy Echo Request to proxy node

  • Proxy node

    • Only sends an MPLS Echo Request on the listed interfaces


P2mp te1
P2MP-TE

Next-Hop Scoping

Proxy Echo Request

Echo Request


Multicast ldp mldp tracing
Multicast LDP (mLDP) Tracing

  • Multicast LDP LSPs are initiated by the leaf nodes

  • Root node may not know the tree topology

  • Failure is most likely to be detected at leaf

  • Leaf is a logical place to begin tracing

  • Proxy Echo Responses can be used to sequentially learn the PHOPs from a leaf to the route

  • Tree is traced from leaf to root


Mldp traceroute
mLDP Traceroute

(Using Next-Hop Scoping)

Proxy Echo Request

Proxy Echo Reply

Echo Request

Echo Reply


Next steps
Next Steps

  • Is this a good idea?

  • Working group draft?


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