Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Multicast traffic in a single vlan across two cat6509 (without router)

Hello,

we've got two catalyst 6509 with ios 12.1(13) connected together via a Gigabit-trunk.

There is a vlan 22 without routing. Both catalyst 6509 have ports in this vlan.

We don't receive multicast on the first c6509, if the multicast sender is located on the second c6509 and reverse.

Do we need one or two "igmp snooping querier" in vlan22 (on one or both catalyst 6509) for a everywhere multicast conversation?

Or is there a simpler way, e.g. "multicast equal broadcast" for selected interfaces?

(Because we don't want configure a vlan22 interface with a ip address)

At the moment we have static mac-address entries for the trunk ports, but this way is not practicable.

Thanks

Mathias

2 REPLIES
Silver

Re: Multicast traffic in a single vlan across two cat6509 (witho

It is good to enable IGMP Snooping or CGMP on all switches whenever multicast is enabled. Otherwise, the switch will flood all multicast packets to all ports

on the same vlan. The following is the requeirment to enable IGMP snooping:

- The switch must have Cisco Group Management Protocol (CGMP) or Internet Group Management Protocol(IGMP) snooping enabled.

- The router must have Protocol-Independent Multicast (PIM) enabled on the interface connected in the VLAN where the source and receivers are located

- If you are using CGMP, the router must have CGMP enabled on the interface connected in the VLAN where the source and receivers are located

New Member

Re: Multicast traffic in a single vlan across two cat6509 (witho

Thank you.

We'have an access router in this vlan. We use this router as a querier in that we have enabed the PIM on this interface only.

Regards

Mathias

227
Views
0
Helpful
2
Replies
CreatePlease login to create content