[c-nsp] How to pass VLAN through router

[Daniel Hooper]

Try bridging 2 dot1q sub interfaces together .. I have a vague memory of doing this somewhere before and it worked.

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Pavel Dimow
Sent: Sunday, 13 February 2011 1:13 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] How to pass VLAN through router

Is this possible at all? I ended in pretty ugly scenario (for a short time period I hope) where I must pass VLAN through router (yes router not L3 switch). The scenario is:

 SW1-----trunk-----R1-----trunk-----R2-----trunk-----L3SWITCH

I don't have control over SW1 and R1, but I do know that I have trunk from my R2 to other side R1 for sure (I already terminate one VLAN on R2). Now, I need somehow to get VLAN from other side (SW1) to L3SWITCH where I will setup a SVI.

Any thoughts? How router behaves considering VLANs? Is it only possible to terminate vlan on subinterface and no vlan passing? It is logical to me, because router is a router not a switch (in my case R2 is Cisco ASR). And IF router will pass VLAN over trunk interfaces how do I control which VLANs are allowed to pass over which interface?
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