I need some insight on dealing with multicast traffic on a multi-VLAN network.
I have two 8600's (v 3.7.0.0) in the core providing connectivity to a variety of closets with one of the following setups:
- BPS2000/450 Stacks (2- BPS2000s, 1 or more 450s)
- 470 Stacks
- 4548 Stacks (slowly replacing the above)
- 5520 Stacks (slowly replacing the above)
- 8100
- 8600 (in the computer room) - 3.7.0.0
The 8600 in the computer room is connected to the two core 8600's using SMLT - 3 links. The majority of the other closets use single uplinks but a few (less than 10) use SMLT.
There are about 60 VLANs (each stack is a VLAN). I have two non-routed VLAN's that are used for a group of equipment that uses multicast (VLAN75 and VLAN76). They only communicate to devices on their specific VLAN and have no need to route any type of traffic. We have another VLAN used for our servers (VLAN100). I am seeing a lot of multicast traffic on this VLAN and do not know the source. This is becoming an issue.
We are not using Snooping or any type of multicast routing.
What alerted us to the multicast traffic was that earlier this week, the 8600 in the computer room went offline. We force a restart and it began working again. We monitored it and found that the box is shutting down one port every few hours due to multicast packet floods. Now when it happens, we can disable the port and re-enable it and everything is fine. That started our search for multicast and we have found flooding of packets to all ports on VLAN100. There are three other stacks in the computer room that have VLAN100 (a 470 stack of 3 switches, a 5520, and a 5530/5520 stack).
How do I get this under control? Do I just enable Snooping on VLAN100 on all the switches with that VLAN? Since this traffic is not routed do I need to do something like DVMRP? I am unsure of how to proceed to 1. stop the links from going down and 2. to control the multicast traffic and stop it from being flooded.
Sorry for the lengthy post.
I have two 8600's (v 3.7.0.0) in the core providing connectivity to a variety of closets with one of the following setups:
- BPS2000/450 Stacks (2- BPS2000s, 1 or more 450s)
- 470 Stacks
- 4548 Stacks (slowly replacing the above)
- 5520 Stacks (slowly replacing the above)
- 8100
- 8600 (in the computer room) - 3.7.0.0
The 8600 in the computer room is connected to the two core 8600's using SMLT - 3 links. The majority of the other closets use single uplinks but a few (less than 10) use SMLT.
There are about 60 VLANs (each stack is a VLAN). I have two non-routed VLAN's that are used for a group of equipment that uses multicast (VLAN75 and VLAN76). They only communicate to devices on their specific VLAN and have no need to route any type of traffic. We have another VLAN used for our servers (VLAN100). I am seeing a lot of multicast traffic on this VLAN and do not know the source. This is becoming an issue.
We are not using Snooping or any type of multicast routing.
What alerted us to the multicast traffic was that earlier this week, the 8600 in the computer room went offline. We force a restart and it began working again. We monitored it and found that the box is shutting down one port every few hours due to multicast packet floods. Now when it happens, we can disable the port and re-enable it and everything is fine. That started our search for multicast and we have found flooding of packets to all ports on VLAN100. There are three other stacks in the computer room that have VLAN100 (a 470 stack of 3 switches, a 5520, and a 5530/5520 stack).
How do I get this under control? Do I just enable Snooping on VLAN100 on all the switches with that VLAN? Since this traffic is not routed do I need to do something like DVMRP? I am unsure of how to proceed to 1. stop the links from going down and 2. to control the multicast traffic and stop it from being flooded.
Sorry for the lengthy post.