[j-nsp] Problem with IGMP on MX480 10.4R7

[Jerzy Pawlus]

Hi,

I have a problem with explicit joining of a multicast group if such
group is already created on the switch. MX seems to reject IGMP joins
and only after router igmp query to "all host" this group can be joined.
There is no problem if the group does not exist yet.

1. There is no 239.239.2.2 and the group can be joined:

09:36:20.969250 IP 10.202.71.229 > 239.239.2.2: igmp v2 report 239.239.2.2

Group: 239.239.2.2
    Source: 10.200.200.203/32 
    Upstream interface: ge-5/1/4.0
    Session description: Organization-Local Scope
    Statistics: 454 kBps, 337 pps, 7845 packets
    Next-hop ID: 0
    Upstream protocol: PIM
    Route state: Active
    Forwarding state: Pruned
    Cache lifetime/timeout: 360 seconds
    Wrong incoming interface notifications: 0


2. When the group 239.239.2.1 exists:

Group: 239.239.2.1
    Source: (null)/0  
    Upstream interface: ge-5/1/4.0
    Downstream interface list: 
        xe-4/1/0.0
    Session description: Organization-Local Scope
    Statistics: 0 kBps, 0 pps, 0 packets
    Next-hop ID: 1048926
    Upstream protocol: MVPN
    Route state: Active
    Forwarding state: Forwarding
    Cache lifetime/timeout: forever
    Wrong incoming interface notifications: 6

Group: 239.239.2.1
    Source: 10.200.200.203/32 
    Upstream interface: ge-5/1/4.0
    Downstream interface list: 
        xe-4/1/0.0
    Session description: Organization-Local Scope
    Statistics: 637 kBps, 474 pps, 350407 packets
    ....

09:39:55.236311 IP 10.202.71.229 > 239.239.2.1: igmp v2 report 239.239.2.1
09:39:55.236311 IP 10.202.71.229 > 239.239.2.1: igmp v2 report 239.239.2.1

above joins are ignored and the:

 "Wrong incoming interface notifications: 6" counter is increased.


3.  When the MX sends 

09:41:15.136068 IP 10.202.71.225 > 224.0.0.1: igmp query v3

and the host responds with:

09:41:24.071645 IP 10.202.71.229 > 224.0.0.22: igmp v3 report, 4 group record(s)


239.239.2.1 is joined 

Group: 239.239.2.1
    Source: (null)/0  
    Upstream interface: ge-5/1/4.0
    Downstream interface list: 
        ge-5/0/0.797 xe-4/1/0.0
    Session description: Organization-Local Scope
    Statistics: 0 kBps, 0 pps, 0 packets
    Next-hop ID: 1048806
    Upstream protocol: MVPN
    Route state: Active
    Forwarding state: Forwarding
    Cache lifetime/timeout: forever
    Wrong incoming interface notifications: 6

Group: 239.239.2.1
    Source: 10.200.200.203/32 
    Upstream interface: ge-5/1/4.0
    Downstream interface list: 
        ge-5/0/0.797 xe-4/1/0.0
    Session description: Organization-Local Scope
    Statistics: 637 kBps, 948 pps, 6602 packets
    Next-hop ID: 1048807                
    Upstream protocol: MVPN             
    Route state: Active                 


Can you help?


Jurek