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9.2

Forwarding VLAN Packets to virtual interfaces

Asked by geschmidtt in Network Design & Methodology, Cisco PIX Firewall, Wireless Local Area Network

Tags: Cisco, VLAN, Wireless

I am having a challenge that I am not sure the best way to solve:

I am replacing an aging PIX with a new ASA 5510.  One thing I want to take advantage of is that the ASA supports virtual interfaces, which I would like to use to channel guest traffic on a wireless lan that I am setting up right now.  The problem is I inherited a rather convoluted environment, which I am loathe to change at this point.  

Here is the problem:

The PIX has an IP address of 10.10.0.253 255.255.0.0.  It is directly plugged into a switch with trunking enabled.  For what ever reason that switch has a IP of 10.10.11.7 255.255.0.0.  This switch has no VLANs defined.  This switch is part of a group of switches that manage the connections in our server room.  One of those switches has the IP address of 10.10.0.1 255.255.0.0 and acts as the default gateway for the entire network.  The PIX is not plugged into that switch.

We have a distribution switch which distributes 5 main VLANs to the 5 floors we use in the building.  Its IP is 10.16.0.1 255.255.255.0.  The VLAN model looks like this 10.16.0.1 for the 6th floor 10.17.0.1 for the 7th etc.  There are guest vlans on each floor. 10.16.3.0  10.17.3.0 etc (for example).  We call them VLAN 63, VLAN 73 etc.

On the new ASA I want the inside interface e0/0 to have in addition to the main network traffic VLAN 63, 73 etc. on virtual interfaces.  So that switch would look something like this:
(Inside) E0/0 - 10.10.0.253  (VLAN63) E0/0.1 - 10.16.3.253. etc.  

Here is the rub.  It looks just plain trunking will not deliver the guest VLAN traffic to the ASA virtual interfaces.  I think the ASA needs to be directly attached to the switch that has the VLANs attached, or I need to do some fancy stuff to make it work.


Diagram:


      PIX                                         Switch                                Dist. Switch       VLAN63
[========]____________[========]____________[========]---<
10.10.0.253                            10.10.11.7                               10.16.0.1       VLAN73


I am not sure whether it make sense to plug the ASA into the "distribution" switch to make this happen, and if so what the various routing configurations would be, or if would even work at all.
 
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[+][-]10/29/09 04:35 PM, ID: 25699192Accepted Solution

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Zones: Network Design & Methodology, Cisco PIX Firewall, Wireless Local Area Network
Tags: Cisco, VLAN, Wireless
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Solution Provided By: Quori
Participating Experts: 1
Solution Grade: A
 
[+][-]10/29/09 06:43 PM, ID: 25699669Author Comment

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