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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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Presentation Transcript
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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