IP renew slow after enable dhcp snooping

[ramarao]

Hi,

I have a issue, as after enabling DHCP Snooping and try to release/renew again, It only manages to grab the DHCP IP like around 30 seconds.

And, if the machine is restarted, it would take longer time or even sometimes would not be able to grab the IP from the DHCP server.

Without DHCP snooping enabled, all is fine.

My setup is user and dhcp server are behind FWSM, both are in the same context but in different segment. I have turned on the DHCP snooping at the core switch where the FWSM resides.

Any suggestions appreciated.

Thank you

Rama

[Vinay Sharma]

Sri,

Moving this to different Forum.

Thanks,

Vinay Sharma

Community Manager - Wireless

Cisco Support Community

[ramarao]

Just to let u guys know,

Case is solved as it is known issue for when the SVI is on the FWSM module. The reason for that is that we are not able to make the internal port channel between the MSFC and the FWSM as trusted.

Here is the BUG for it :

CSCsf15285    FWSM channel cannot be configured as DHCP Snooping trusted port