We have a multicast problem and would like some help…
We have 4 Cisco 6509 Switches running in 2 sets of 2 VSS as shown in attachement
Each VSS instance is connected by 6x10G links.
The 2 VSS instances are connected with 4x10G (A, B, C, D) links in a Trunked EtherChannel.
We have 4 multicast sources (P-S above), each source outputting 12 multicast groups. 2 sources connect to VSS1 Primary, the other 2 connect to VSS2 Standby.
We have a multicast client (X & Y) plugged into each of the VSS2 switches on the same VLAN as the multicast source. i.e. there is no multicast routing involved.
We are experiencing very odd behaviour and would like some help.
We don’t always see all multicast groups on the VSS2 primary.
We’ve done the following testing with various different combinations of links between the VSS instances, which is even odder:
Test | VSS2 Primary Client | VSS2 Secondary Client |
Link A alone (B, C, D disconnected) | All multicast groups received. | All multicast groups received. |
Link B alone (A, C, D disconnected) | No multicast groups received. But can ping the IP address of the multicast source!!! | All multicast groups received. |
A, B, C & D connected | Only some of the multicast groups received!! | All multicast groups received. |
We are using the following OS:
s72033-adventerprise_wan-mz.122-33.SXI2a.bin
My conclusion is that the problem is something internal to the way the cisco’s are handling multicast under VSS. Normal TCP/ICMP seem to work fine.
Please help!!!
Thanks
