On a Cisco 3750G switch I have a number (30-ish) of video processors in a vLAN providing multicast streams to clients via a router. Because all of the machines are in the same vLAN they see each other's output, this is causing issues because of the high volume of traffic.
Is there a way to isolate the multicast traffic so it isn't sent to all of the peer servers, and just the upstream (yet allow them to be in the same vLAN and see unicast traffic)? I was thinking that a private vLAN for each server/switch-port would do the trick. What would be the side-effects of this? Or can I use multicast blocking?
In the network diagram we have unicast video sources to each server on vLAN 1 (green). The encoders process the video and provide multicast streams (unique per encoder) to clients via vLAN 2 (red) and router 1. IGMP snooping is enabled on switch 2.
The problem is that the very high volume of traffic on the red vLAN is causing issues. A previous Network Engineer tried to resolve this at one location by splitting the red vLAN into multiple vLANs. This seemed to help, but didn't really solve the issue. I would like to know if we make all of the encoder ports in the red network into isolated ports in a private vLAN, so they don't see each other's traffic, would this solve this problem.
The switch config is:
# show running-config version 12.2 [...] ! hostname swtch02 ! [...] system mtu routing 1500 ip routing ! ip multicast-routing distributed ! ! port-channel load-balance src-dst-ip spanning-tree mode pvst spanning-tree extend system-id ! vlan internal allocation policy ascending ! vlan 2 name video_out ! interface GigabitEthernet1/0/1 description encoder-1 switchport access vlan 2 switchport mode access spanning-tree portfast ! interface GigabitEthernet1/0/2 description encoder-2 switchport access vlan 2 switchport mode access spanning-tree portfast ! interface GigabitEthernet1/0/3 description encoder-3 switchport access vlan 2 switchport mode access spanning-tree portfast ! interface GigabitEthernet1/0/4 description encoder-4 switchport access vlan 2 switchport mode access spanning-tree portfast [...] ! interface Vlan2 ip address 192.168.1.254 255.255.255.0 ! ip classless ip route 0.0.0.0 0.0.0.0 x.x.x.x [...] end