[c-nsp] trunks, vlans and a metroLAN

[Mateusz Błaszczyk]

2008/5/1 Mark Kent <mark at noc.mainstreet.net>:
>
>  I've got the following scenario:
>
>  a) a 7201 with a trunk to a 4948
>
>  b) a metroLAN from that 4948 to a 6509
>
>  c) a 7206/npe-g2 with a trunk to that 6509
>
>  I need the 7201 to be layer3-connected to the 7206.
>
>  I can't get it to work.  This is what I have:
>
>  The 7201:
>
>  interface GigabitEthernet0/1.90
>   encapsulation dot1Q 90
>   ip address 192.0.2.56 255.255.255.254
>
>  and
>
>  The 4948 trunk port to the 7201:
>
>  interface GigabitEthernet1/1
>   description TRUNK to c7201-1 router port 0/1
>   switchport trunk encapsulation dot1q
>   switchport trunk allowed vlan 87,90
>   switchport mode trunk
>
>  The 4948 port for the metrolan:
>
>  interface GigabitEthernet1/48
>   description metroLAN to c6509 g5/2
>   switchport trunk encapsulation dot1q
>   switchport trunk allowed vlan 90
>   switchport mode trunk
>
>  The 6509 port for the metrolan:
>
>  interface GigabitEthernet5/2
>   description metroLAN to c4948 port 1/48
>   switchport
>   switchport trunk encapsulation dot1q
>   switchport trunk allowed vlan 90
>   switchport mode trunk
>
>  The 6509 port to the 7206:
>
>  interface GigabitEthernet3/1
>   description TRUNK to c7206 router port 0/3
>   switchport
>   switchport trunk encapsulation dot1q
>   switchport trunk allowed vlan 78,90
>   switchport mode trunk
>
>  And the 7206/NPE-G2:
>
>  interface GigabitEthernet0/3.90
>   encapsulation dot1Q 90
>   ip address 192.0.2.57 255.255.255.254
>
>  Now, I've also tried it with the ports on each end of the metroLAN
>  configured not as trunks, but simply like this:
>
>  interface GigabitEthernet1/48
>   description metroLAN to c6509 g5/2
>   switchport access vlan 90
>
>  and
>
>  interface GigabitEthernet5/2
>   description metroLAN to c4948 port 1/48
>   switchport access vlan 90
>
>  but with no luck.
>
>  What gives?  Do I really need the cooperation of the metroLAN
>  provider to make this work?
>
>  Thanks,
>  -mark
>  _______________________________________________
>  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/
>

You have to make sure that your L2 path is end to end, so what do the
switches say?

show vlan 90
show spanning-tree vlan 90

on both switches...
I assume the interfaces are up/up and patched correctly...

Best Regards,

-mat