troubleshooting Question

Span a vlan across an ASA

Avatar of trojan81
trojan81 asked on
Cisco
4 Comments1 Solution791 ViewsLast Modified:
Hi experts,

I need to bridge a VLAN to another switch. In between these two switches is an ASA.

Switch1 ---> (gi1/0) ASA (gi1/1)----> Switch2

Switch1 has a routed /30 connection to the ASA on gi1/0.
The connection between the ASA to Switch2 is a trunk with existing subinterfaces.

I want to span our management Vlan5 from switch 1 to switch 2.

Let me know if I am wrong:

#1) Run another connection from switch1 to the ASA and make this a trunk connection. On the ASA side it will look like:

interface GigabitEthernet1/2
 description Bridge_VLAN5
 no shutdown
 no nameif
 no security-level
 no ip address

interface GigabitEthernet1/2.5
 description Bridge for Vlan5
 vlan 5
 no nameif
 no security-level
 no ip address


#2. Add a subinterface on Gi1/1 for Vlan5

interface GigabitEthernet1/1.5
 description Bridge for Vlan5
 vlan 5
 no nameif
 no security-level
 no ip address


The switch side will have an SVI for VLAN 5 and the physical ports will be switchport access VLAN 5.

Does this sound doable?


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