Re: PIM Dense mode RP issue

I could never get that group to disappear. I tried to make it disappear but even though the routers are not configured for auto rp, that darn group still appears.

It would be great if someone knows how to turn it off when auto rp isn't being used.

-----Original Message-----
From: Nadeem Rafi <nrafia_at_gmail.com>
Date: Tue, 1 Dec 2009 00:46:04
To: Cisco certification<ccielab_at_groupstudy.com>
Subject: PIM Dense mode RP issue

hi,
i am running 3 routers on Ethernet link. all the routers are in pim dense
mode but getting reports and messages for 224.0.1.40. As for as i know there
is no RP in pim dense mode.

R1
debug ip igmp
*Mar 1 00:33:06.571: IGMP(0): Received v2 Report on FastEthernet0/0 from
155.1.146.6 for 224.0.1.40
*Mar 1 00:33:06.575: IGMP(0): Received Group record for group 224.0.1.40,
mode 2 from 155.1.146.6 for 0 sources
*Mar 1 00:33:06.579: IGMP(0): Cancel report for 224.0.1.40 on
FastEthernet0/0
*Mar 1 00:33:06.583: IGMP(0): Updating EXCLUDE group timer for 224.0.1.40
*Mar 1 00:33:06.583: IGMP(0): MRT Add/Update FastEthernet0/0 for
(*,224.0.1.40) by 0

RSRack1R1#sh ip igmp interface
FastEthernet0/0 is up, line protocol is up
  Internet address is 155.1.146.1/24
  IGMP is enabled on interface
  Current IGMP host version is 2
  Current IGMP router version is 2
  IGMP query interval is 60 seconds
  IGMP querier timeout is 120 seconds
  IGMP max query response time is 10 seconds
  Last member query count is 2
  Last member query response interval is 1000 ms
  Inbound IGMP access group is not set
  IGMP activity: 1 joins, 0 leaves
  Multicast routing is enabled on interface
  Multicast TTL threshold is 0
  Multicast designated router (DR) is 155.1.146.6
  IGMP querying router is 155.1.146.1 (this system)
  Multicast groups joined by this system (number of users):
      224.0.1.40(1)

RSRack1R1#sh ip mroute
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
       L - Local, P - Pruned, R - RP-bit set, F - Register flag,
       T - SPT-bit set, J - Join SPT, M - MSDP created entry,
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
       U - URD, I - Received Source Specific Host Report,
       Z - Multicast Tunnel, z - MDT-data group sender,
       Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched, A - Assert winner
 Timers: Uptime/Expires
 Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 224.0.1.40), 00:17:48/00:02:47, RP 0.0.0.0, flags: DCL
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    FastEthernet0/0, Forward/Dense, 00:17:48/00:00:00

RSRack1R1#sh ip pim int

Address Interface Ver/ Nbr Query DR DR
                                          Mode Count Intvl Prior
155.1.146.1 FastEthernet0/0 v2/D 2 30 1
 155.1.146.6

I cannot understand this behaviour any help will be appreciated.

Best Regards,

Nadeem Rafi

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Received on Mon Nov 30 2009 - 21:50:31 ART