[c-nsp] router does not see IGMP joins

[Victor Sudakov]

tao liu wrote:
> you may check "IGMP activity: 8 joins, 6 leaves" to see if new join is received.

"debug ip igmp 224.0.1.3" shows no reports received UNLESS I forcibly
join the interface to the 224.0.1.3 group.

> maybe something is wrong with multicast router config.

I posted the output of "sh ip igmp interface", do you see anything
wrong with the config?

> 
> On 3/2/12, Victor Sudakov <vas at mpeks.tomsk.su> wrote:
> > Colleagues,
> >
> > What could be the reason that a Cisco 1841 router (IOS 12.4(13r)T)
> > does not see IGMP joins to a particular group? tcpdump shows that the
> > joins are being sent to the network, however "debug ip igmp 224.0.1.3"
> > does not show them.
> >
> > Here is the packet dump: http://zalil.ru/32803276
> > and the configuration:
> >
> >
> > kedrovy#sh ip igmp interface fastEthernet 0/0
> > FastEthernet0/0 is up, line protocol is up
> >   Internet address is 10.14.128.129/26
> >   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: 8 joins, 6 leaves
> >   Multicast routing is enabled on interface
> >   Multicast TTL threshold is 0
> >   Multicast designated router (DR) is 10.14.128.129 (this system)
> >   IGMP querying router is 10.14.128.129 (this system)
> >   Multicast groups joined by this system (number of users):
> >       224.0.1.40(1)  224.0.1.1(1)
> > kedrovy#
> >
> > I can forcibly join the interface to the 224.0.1.3 group and then the
> > traffic begins to flow:
> >
> > kedrovy(config-if)#ip igmp join-group 224.0.1.3
> > kedrovy(config-if)#^Z
> > kedrovy#
> > 1w2d: IGMP(0): WAVL Insert group: 224.0.1.3 interface:
> > FastEthernet0/0Successful
> > 1w2d: IGMP(0): Send v2 Report for 224.0.1.3 on FastEthernet0/0
> > 1w2d: IGMP(0): Received v2 Report on FastEthernet0/0 from 10.14.128.129 for
> > 224.0.1.3
> > 1w2d: IGMP(0): Received Group record for group 224.0.1.3, mode 2 from
> > 10.14.128.129 for 0 sources
> > 1w2d: IGMP(0): Switching to EXCLUDE mode for 224.0.1.3 on FastEthernet0/0
> > 1w2d: IGMP(0): Updating EXCLUDE group timer for 224.0.1.3
> > 1w2d: IGMP(0): MRT Add/Update FastEthernet0/0 for (*,224.0.1.3) by 0
> > 1w2d: IGMP(0): MRT Add/Update FastEthernet0/0 for (*,224.0.1.3) by 4
> > 1w2d: %SYS-5-CONFIG_I: Configured from console by vty0 (10.14.134.125)
> > kedrovy#
> > 1w2d: IGMP(0): Send v2 general Query on FastEthernet0/0
> > 1w2d: IGMP(0): Set report delay time to 2.8 seconds for 224.0.1.3 on
> > FastEthernet0/0
> > 1w2d: IGMP(0): Send v2 general Query on FastEthernet0/1
> > kedrovy#
> > 1w2d: IGMP(0): Send v2 Report for 224.0.1.3 on FastEthernet0/0
> > 1w2d: IGMP(0): Received v2 Report on FastEthernet0/0 from 10.14.128.129 for
> > 224.0.1.3
> > 1w2d: IGMP(0): Received Group record for group 224.0.1.3, mode 2 from
> > 10.14.128.129 for 0 sources
> > 1w2d: IGMP(0): Updating EXCLUDE group timer for 224.0.1.3
> > 1w2d: IGMP(0): MRT Add/Update FastEthernet0/0 for (*,224.0.1.3) by 0
> >

-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
sip:sudakov at sibptus.tomsk.ru