[c-nsp] EoMPLS between 7600 & 7200 config clarification

Jose lobo at allstream.net
Wed Feb 6 06:36:57 EST 2008


Jose wrote:
> Hi everyone.  I'm doing some preliminary testing in our lab in order to 
> deploy EoMPLS on our ethernet network but I've run into a little bit of 
> a snag and was wondering if anyone could clarify something for me.
>
> The setup I have is 3550---7603-SUP32---7204VXR---3550
>
> I have VLAN 800 setup to cross from one 3550 to the other.  The relevant 
> portions of the config are as follows:
>
> 7603:
> interface GigabitEthernet2/2
>  description to 3550
>  switchport
>  switchport trunk encapsulation dot1q
>  switchport trunk allowed vlan 800
>  switchport mode trunk
>  no ip address
>  load-interval 30
> !
> interface Vlan800
>  xconnect 10.0.1.4 800 encapsulation mpls
> !
> interface GigabitEthernet1/1
>  description 7603 to 7204
>  switchport
>  switchport trunk encapsulation dot1q
>  switchport trunk allowed vlan 220
>  switchport mode trunk
>  no ip address
>  load-interval 30
> !
> interface Vlan220
>  ip address 10.0.0.18 255.255.255.252
>  load-interval 30
>  tag-switching mtu 1520
>  tag-switching ip
> !
>
> 7204VXR:
> interface FastEthernet1/0.220
>  encapsulation dot1Q 220
>  ip address 10.0.0.17 255.255.255.252
>  ip ospf cost 40
>  tag-switching mtu 1520
>  tag-switching ip
> !
> interface FastEthernet3/0.800
>  encapsulation dot1Q 800
>  xconnect 10.0.1.1 800 encapsulation mpls
> !
>
> Now when I do a "show mpls l2 vc" I can see the circuit up from the 7204 
> side but down from the 7603 side.  I think I have everything setup 
> properly but can't figure out why it wouldn't work.
>
> If I change things around a bit and reconfigure the 7603 to use 
> sub-interfaces with dot1q instead of vlan interfaces like this:
>
> interface GigabitEthernet2/2.800
>  encapsulation dot1Q 800
>  xconnect 10.0.1.4 800 encapsulation mpls
> !
>
> The circuit is up from both ends and pings from/to each 3550 are successful:
>
> frort01-lab#sh mpls l2 vc
>
> Local intf     Local circuit        Dest address    VC ID      Status    
> -------------  -------------------- --------------- ---------- ----------
> Gi2/2.800      Eth VLAN 800         10.0.1.4        800        UP        
> 7603-lab#
>
> Is this the only way to get EoMPLS to work between these two devices?  
> I'm sure I've seen the xconnect command used on VLAN interfaces before 
> and it has worked fine.
>
> Any thoughts or comments would be greatly appreaciated.
>
> Thanks.
>
> Jose
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>   
One quick side question since we're all talking EoMPLS.  Is it possible 
to do VLAN translation/remapping with EoMPLS?  Can one side have SVI 800 
and the other side have SVI 400 but use VC 300 on both xconnect 
statements to "tie them" together?


Jose

P.S. Thanks for all the replies everyone has given so far.  It's been a 
very good learning experience.



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