[c-nsp] How to pass VLAN through router

[Christopher J. Wargaski]

Could you perhaps use a bridge group? We can bridge traffic from a physical
interface to a wireless controller module. Perhaps you could have a sub
interface on each of the physical interfaces for the VLAN using the bridge
group. How about something like this:


interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
!
interface FastEthernet0/0.5
 description Wireless RF-Video
 encapsulation dot1Q 5
 bridge-group 5
!
interface FastEthernet0/1.5
 encapsulation dot1Q 5
 bridge-group 5
!
interface BVI5
 description Optional IP for troubleshooting / management
 ip address 172.16.240.43 255.255.255.0
!
bridge 5 protocol ieee
bridge 5 route ip





Date: Sat, 12 Feb 2011 18:13:02 +0100
> From: Pavel Dimow <paveldimow at gmail.com>
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] How to pass VLAN through router
> Message-ID:
>        <AANLkTi=2L7Oi2eCviv8Nk+_rWrGHuxyLan8=oOgTqQn=@mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> 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?
>
>
>