Re: "Info source" in show ip pim rp mapping

From: Eugene Ward (eward15@juno.com)
Date: Thu Nov 02 2006 - 09:25:50 ART


You are just missing a hostname for the router. Use "ip host" on the local
router to configure a hostname for the other routers, and you should see it
show up.
Eugene
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Folks, can someone please explain this oddity for me ? (Or is this an oddity
at the
first place ?)

  Cisco documentation defines the Info source field as:

            Info source
    RP mapping agent that advertised the mapping.

  I have 3 routers connected to each other forming a triangle: R4, R6 and R2

  R4 is the RP for a group. R6 is the mapping agent for the group. Auto-RP is
used. This
triangle of routers is connected to 4 other routers.

  When I do "show ip pim rp mappings" ... on all routers

  R4 is the RP for the group ... rightfully so.
  On R2 and R4 the "Info source" is set to R6
  But on R6 the "Info source" is set to R4

  I even reset R6 ro see if there is a change. All other routers in the
network show R6 as
the Info Source.

  Here is the output:

  R4--293#show ip pim rp mapping
  PIM Group-to-RP Mappings
  This system is an RP (Auto-RP)
  Group(s) 224.0.0.0/4
  RP 4.4.4.4 (?), v2v1
  Info source: 6.6.6.6 (?), elected via Auto-RP
  Uptime: 00:01:18, expires: 00:02:40 R4--293#

  R6--295#show ip pim rp mapping
  PIM Group-to-RP Mappings
  This system is an RP-mapping agent (Loopback0)
  Group(s) 224.0.0.0/4
  RP 4.4.4.4 (?), v2v1
  Info source: 4.4.4.4 (?), elected via Auto-RP
  Uptime: 00:00:59, expires: 00:01:59 R6--295#

  R2--291#show ip pim rp mapping
  PIM Group-to-RP Mappings
  Group(s) 224.0.0.0/4
  RP 4.4.4.4 (?), v2v1
  Info source: 6.6.6.6 (?), elected via Auto-RP
  Uptime: 00:01:14, expires: 00:02:42 R2--291#

  Any comments ?



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