Lorenzo,

Try this...

     bridge irb

     int bvi 172
         ip addr 192.168.172.1 255.255.255.0
         ip helper ...
         ip helper ...

     int bvi 173
         ip addr 192.168.173.1 255.255.255.0
         ip helper ...
         ip helper ...

     int g49
         no ip addr

     int g49.172
         no ip addr
         encap dot1q 172
         bridge-group 172

     int g49.173
         no ip addr
         encap dot1q 173
         bridge-group 173

     int FastEthernet1
         no ip addr
         bridge-group 172

     int FastEthernet2
         no ip addr
         bridge-group 173
         bridge-group 173 spanning-disabled

     Global:
         bridge 172 protocol ieee
         bridge 173 protocol ieee
         bridge 172 route ip
         bridge 173 route ip

In your earlier configuration, I believe it would have routed traffic
between g49.172 and g49.173 fine (so ports on VLAN 172 and 173 on the non-L3
switch should be able to ping hosts in the other VLAN).  The
'spanning-disabled' should help the workstation port come up faster (sort of
like portfast, but I believe in this case STP is TOTALLY disabled - don't
create a LOOP!!!).

Regards,
Adrian


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