We have 3560G(IP Base 15.0.2.SE4) as core and 2960's on access.
We enable DHCP snooping on all switches with uplinks on 2960's and links to DHCP servers on 3560 configured as "trusted". All worked fine.
Then we enabled link aggregation(two gigs between 3560 and each of 2960's) and our users stopped to receive IP-addresses. We tried all type of link aggregation(pagp, lacp, etherchannel) with no result. We disabled DHCP snooping on 3560 and users received they IP-addresses.
Does DHCP snooping works through aggregated links?
I experience the same issue. It seems to be related to the software version of 15.0(2)SE4
with ip dhcp snooping enabled it seems that if the packet is coming in via a port-channel, then requests,and informs are seen etnering the switch and are forwarded. (i see them on the next switch too). Discovers enter the switch, but don't seem to be forwarded. (i don't see them anymore on the next switch)
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