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DHCP snooping 3560 issue

JJay
Level 1
Level 1

Hi,

I am trying to get DHCP snooping setup on a single 3560 switch that connects to a Cisco 2921 router. I am running these commands.

ip dhcp snooping (global)
ip dhcp snooping trust (interface to router)    Router is running DHCP
ip dhcp snooping vlan 150 (global)   Data Vlan
no ip dhcp snooping information option (global)

The Binding table does not build and when debugging I get this in the log.

Mar  1 14:35:01.621 EDT: DHCP_SNOOPING: intercepted DHCPACK with no DHCPOPT_LEASE_TIME option field, packet is still forwarded but no snooping binding update is performed.

I am not sure why the lease time is not passed along.

3560 IOS 12.2(55)SE10 

2921 IOS universalk9-mz.SPA.154-3.M3

The same config works fine when the 3560 is connected to an Adtran router.

1 Reply 1

JJay
Level 1
Level 1

Sites with Cisco routers are now working fine. The sites with Adtran routers show all 0.0.0.0 for the IP address in the binding table.

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