[c-nsp] DHCP Snooping on Aggregation Switches

Nic Werner werner at sonoma.edu
Thu Jun 22 17:56:24 EDT 2006


Hi all,
	We're having trouble configuring 3750s as an aggregation switch w/DHCP 
snooping. The edge devices work just fine, building the binding table, 
and passing DHCP. However, the cisco docs show that the aggregation 
switch can build this binding table also, can anyone help or confirm 
this? We always get an empty binding table on the aggregation while the 
edge is populated

- Nic.

This is the aggregation:

Switch DHCP snooping is enabled
DHCP snooping is configured on following VLANs:
28
Insertion of option 82 is enabled
Option 82 on untrusted port is allowed
Verification of hwaddr field is enabled
Interface                    Trusted     Rate limit (pps)
------------------------     -------     ----------------
GigabitEthernet1/0/1         yes         100

This is the edge:

DHCP snooping is configured on following VLANs:
28
Insertion of option 82 is enabled
    circuit-id format: vlan-mod-port
     remote-id format: MAC
Option 82 on untrusted port is not allowed
Verification of hwaddr field is enabled
Interface                    Trusted     Rate limit (pps)
------------------------     -------     ----------------
GigabitEthernet1/0/1         yes         100


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