[c-nsp] Cisco 7206VXR as ATM switch

Bob Tinkelman bob at tink.com
Wed Jun 1 12:25:31 EDT 2005


> The feature you want is
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s27/fslocal.htm

Hmmm.  This is a feature I've never used before.

I have a few routers which have been configured, forever,
to use frame-relay encapsulation on inter-router DS3s and
to bridge PVCs to each other or to Ethernet sub-interfaces.

On one router I might have something like this:

  | bridge irb
  ...
  | interface Serial2/0/20:0.151 point-to-point
  !  description PVC on customer T1
  |  frame-relay interface-dlci 151
  |  bridge-group 151
  ...
  | interface Serial3/0.151 point-to-point
  !  description PVC to "other router"
  |  frame-relay interface-dlci 151
  |  bridge-group 151
  ...
  | bridge 151 protocol ieee


And, then on another router:

  | bridge irb
  ...
  | interface Serial3/0.151 point-to-point
  !  description PVC to "other router"
  |  frame-relay interface-dlci 151
  |  bridge-group 151
  ...
  | interface GigabitEthernet2/0.151
  !  description Customer VLAN
  |  encapsulation isl 151
  |  bridge-group 151
  ...
  | bridge 151 protocol ieee


This works fine.  

Would I be better off using "Layer 2 Local Switching" instead? 

The referenced document doesn't list F/R-to-Ethernet as supported,
only ATM-to-Ethernet.  If that's really not supported, I guess I'd
have to reconfigure the T3s to be ATM instead of Frame-Relay.

--
Bob Tinkelman <bob at tink.com>
ISPnet, Inc.    718.464.4747


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