3750 Switch not forwarding DHCP requests 12.2(50) IOS

Unanswered Question
Sep 14th, 2009

We upgraded our 3750 switch to 12.2(50) version IOS and now are are having issue with switch not forwarding any DHCP request.

Need help

I have this problem too.
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gthermaenius Mon, 09/14/2009 - 11:53

There is a known bug that states that if you are using multicast block feature enabled it also blocks unknown broadcast such as dhcp discovery. Are you using the multicast block feature?

patel.nishit Tue, 09/15/2009 - 02:10

I upgraded from 12.2(44)SE1 because it didn't support the tacacs source interface command. Which is a bug.

But a L3 switch not forwarding DHCP requests is a major problem rather than a bug. The switch is forwarding traffic okay, but the IP helper is failing.

Should the config of a member switch in the stack (rather than master) include

a) IP addresses of the vlans.

b) should the vlan interfaces of the member switch be shutdown.


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