IGMP Snooping, Layer 3 or not.

rakem

I have read conflicting things regarding IGMP snooping.

Some books say that only layer 3 switches can use IGMP snooping, others say that it can run on a normal layer 2 switch.....

so whats the correct statement?

mikej412

Works fine on a 2950

S2950-2#show ip igmp snooping vlan 1
Global IGMP Snooping configuration:
-----------------------------------
IGMP snooping              : Enabled
IGMPv3 snooping (minimal)  : Enabled
Report suppression         : Enabled
TCN solicit query          : Disabled
TCN flood query count      : 2
Last member query interval : 1000

Vlan 1:
--------
IGMP snooping                       : Enabled
Immediate leave                     : Disabled
Multicast router learning mode      : pim-dvmrp
Source only learning age timer      : 10
Last member query interval          : 1000
CGMP interoperability mode          : IGMP_ONLY

ITdude

I guess that answers that question!

dtlokee

The answer now is L2 and L3 switches, but a few years back, IGMP snooping was not available on the L2 platforms because the ASICs couldn't deal with anything beyond the L2 header. Depending on how old the resource is, the information may have been accurate when it was written.