09-14-2009 07:56 AM - edited 03-06-2019 07:42 AM
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
09-14-2009 11:53 AM
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?
09-15-2009 02:10 AM
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.
09-17-2009 08:31 AM
Go to 12.2(50)SE3 or 12.2(52)SE when it comes out. Reason being memory leak bug if you use http or https to manage switch and also the Cisco Security Advisory: TCP State Manipulation Denial of Service Vulnerabilities in Multiple Cisco Products
Advisory ID: cisco-sa-20090908-tcp24
http://www.cisco.com/warp/public/707/cisco-sa-20090908-tcp24.shtml
HTH.
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