[c-nsp] router does not see IGMP joins

[tao liu]

you may check "IGMP activity: 8 joins, 6 leaves" to see if new join is received.
maybe something is wrong with multicast router 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
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