[c-nsp] vlan across a routed link

[Phil Mayers]

teklay gebremichael wrote:
> i work in a university which has three campuses. on each campuse,
> there is one cisco 6509 switch as a core switch. all other switches
> (L2) are in vtp client except the core switches. the campuses are
> connected with a routed link. so, one campuse, has 10.128.0.0/16
> subnet and the others have a subnet of 10.129.0.0/16 and
> 10.130.0.0/16. rip v2 is used on the intercampuse links to advertise
> individaul vlans.
> 
> here is my problem.
> 
> i'm asked to create a vlan with a subnet id of 192.168.1.0/24. but
> computers in this vlan are located in the 10.128.0.0/16 campuse and
> 10.130.0.0/16 campuse.the link between the 10.128.0.0/16 and
> 10.130.0.0/16 is not trunk it is routed with ip address. so can any
> body suggest me how to implement such senario which allows one vlan
> (in this case 192.168.1.0/24) to be visible from the two campuses?
> i.e to propage that specific valn across a routed link not a trunk
> link. thanks

You will need to convert the link from routed to switchport. That is, 
transform this:

interface Gi1/1
   ip address a.b.c.d

...to:

interface Gi1/1
   switchport
   switchport mode trunk
   switchport trunk native vlan 4000
   switchport trunk allowed vlan yourvlan,4000

int Vlan4000
   ip address a.b.c.d