[nsp] vlans unreachable

[Bruce Pinsky]

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Roger wrote:

| I've setup two subinterfaces on two seperate routers.  The etherchannel
| links connecting them to the switch are trunks w/ no restrictions.
| Below I've setup two virtual interfaces on the same subnet and same
| vlan...  The layer 3 info is correct as is the vlan encapsulation type
| and vlan number.
|
| RouterA
| interface Port-channel1.201
| encapsulation dot1Q 201
| ip address 192.168.201.1 255.255.255.0
|
| RouterB
| interface Port-channel1.201
| encapsulation dot1Q 201
| ip address 192.168.201.2 255.255.255.0
|
| When on each router I can ping its local 192.168.201.x address but not
| the far end address.  No acls are in place that would prevent this.
| Also the arp tables on each router do _not_ show the others
| 192.168.201.x address - only its own....
|
| I've tried clearing the arp table and uping/downing each interface on
| both routers - still no connectivity between the two.
|
| Now I can put in a static routes on each router -like so
|
| routerA
| ip route 192.168.201.2 255.255.255.255 Port-channel1.1 192.168.0.2
| routerB
| ip route 192.168.201.1 255.255.255.255 Port-channel1.1 192.168.0.1
|
| And that will give me connectivity but I'm not seeing why this is needed
| as subnet+vlan info is the same..
|
| On the main sub-interface port-channel 1.1
|
| RouterA
| interface Port-channel1.1
| encapsulation dot1Q 1 native
| ip address 192.168.0.1 255.255.255.0
|
| RouterB
| interface Port-channel1.1
| encapsulation dot1Q 1 native
| ip address 192.168.0.2 255.255.255.0
|
| The above works fine.  I'm at a loss as to how exactly the 'native' tag
| effects vlans in this situation.
| I feel I should have connectivity in the 192.168.201.0/24 subnet
|
| Suggestions?
|

How are the routers connected?  Directly or thru a switch?  What do you see
if you turn on "debug ip icmp" and "debug arp" on both the routers?  Are
you seeing any error message?  Any error counters increasing in the output
of "sho ip traffic"?  Does the output of "show interfaces port-channel"
indicate the port channel is functioning properly?

- --
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bep

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