[c-nsp] MPLS and VLAN on same FE or GE interface ?

[Matthew Kirkland]

Code Monkey wrote:
> Hi,
> 
> Back in 2003 I failed miserably at configuring two 7206 VXR so that
> their FE interfaces could be connected to a VLAN switch, running MPLS
> in one VLAN and non-MPLS in other VLANs.
> 
> Basically I'd like to have
> 
> int fa0/0.2
>   description MPLS VLAN for my routers
>   encapsulation dot1Q 2
>   ip address A.X 255.255.255.248
>   tag-switching ip
> 
> int fa0/0.3
>   description VLAN for my servers
>   encapsulation dot1Q 3
>   ip address B.Y 255.255.255.240
> 
> int fa0/0.4
>   description VLAN for client-controlled servers
>   encapsulation dot1Q 4
>   ip address C.Z 255.255.255.0
> 
> etc.
> 
> This means that I could connect an incoming FE running pure MPLS over
> Ethernet to a 3550 switch (switchport access vlan 2) and from there on
> to two 7206 G1 on trunked interfaces, instead of having to do as I've
> done until now: dedicate one interface per router and a switch to
> MPLS, and run VLAN on the other interfaces.
> 
> On ATM interfaces I can do this with no problem.
> 
> On ethernet interfaces I never managed to do this, and I never managed
> to understand why. In hindsight it could have been the switch... Now
> when planning a bigger network the separation between my MPLS network
> and my VLAN network is becoming a burden.
> 
> Should I be able to do this or is there some conflict between MPLS
> tags and VLAN tags on the same packet ? I need to know so I can decide
> what equipment to buy.
> 
> TIA
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
> 

Hi

We run this quite happily , Have you adjusted the mtu on the interface ?

tag-switching mtu 1508

should make room for both the vlan tag and the mpls tags

Matt