Re: PIM Dense mode RP issue

It must be the week for "interesting features" here on GS with my findings
on the FRTS byte-limit last night, and now multicast groups that we don't
need :P

On Mon, Nov 30, 2009 at 5:05 PM, Nadeem Rafi <nrafia_at_gmail.com> wrote:

> can some one point to any documentation about this feature, as all of my
> books are silent about this behaviour.
>
> Best Regards,
>
> nadeem rafi
>
> On Tue, Dec 1, 2009 at 12:56 AM, Roy Waterman <roy.waterman_at_gmail.com
> >wrote:
>
> > Dont worry bout it :)
> >
> > From what ive heard/read it was simpler easier to code things this way so
> > that 224.0.1.40 always appears, regardless of whether pim-sm or dm is
> being
> > used.
> > It has no relevance to PIM DM, its just there :)
> >
> > Just ignore it.
> > Plenty more things to worry about in the lab :)
> >
> > 2009/11/30 <ron.wilkerson_at_gmail.com>
> >
> > 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
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
> >>
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> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> > --
> > Regards
> > Roy
>
>
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>
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>
>
>
>
>
>
>

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