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Configure the ASA to pass voice vlans

Posted on 2008-10-02
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Last Modified: 2012-05-05
hello!

I have an unmanaged Cisco router from the ISP which provide voice to the internal network. I want to put an ASA 5510 between the router and the switch.

how can I configure the ASA to pass the voice vlans ? do I need to configure sub-interfaces?

THX
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Question by:ch_eid
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7 Comments
 
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Expert Comment

by:Soulja
ID: 22626936
What is providing routing for your vlans ? I assume the switch must be layer 3 or is the ISP router providing vlan routing?
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Author Comment

by:ch_eid
ID: 22627033
the router from the isp is routing between vlans
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Soulja earned 500 total points
ID: 22627206
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Author Comment

by:ch_eid
ID: 22627239
is there any other way, because I want to use VPN on the firewall...and as I know it is not supported in transparent mode
thx
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Expert Comment

by:Soulja
ID: 22627421
I only recommended transparent mode because you would have to collaborate with the ISP to change the configuration of their router if you want the ASA to do the routing.
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Expert Comment

by:Cyclops3590
ID: 22629956
so long as the router uses 802.1Q for doing vlans, you just need to create subinterfaces with the correct vlan tags on the outside physical interface; one for data and one for voice.  after that you can route it however you want.  You'll need to make sure the static and acl commands are created properly to not interfere with the voice vlan, but you should be fine.
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Author Comment

by:ch_eid
ID: 22633137
The ISP is there to help us, but I just want to know if I can do this with PAT,

Thx al lot!
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