quick DLSW+ question

From: Kinton Connelly (kinton@xxxxxxxxxxxx)
Date: Wed May 03 2000 - 16:51:57 GMT-3

   
Ok, so I'm going back through some of the CCIE Boot Camp labs and on lab 3,
it wants me to establish a DLSW+ connection between R2's ethernet0 and R3's
tokenring0. No problem. Here's how I'd do it:

R2 

--
dlsw local-peer peer-id 137.20.100.2
dlsw remote-peer 0 tcp 137.20.3.33
dlsw bridge-group 1
!
interface Ethernet0
  ip address 137.20.20.1 255.255.255.0
  bridge-group 1

R3
--
source-bridge ring-group 10
dlsw local-peer peer-id 137.20.3.33
dlsw remote-peer 0 tcp 137.20.100.2
dlsw bridge-group 1
!
interface TokenRing0
  ip address 137.20.30.1 255.255.255.0
  ring-speed 16
  source-bridge 1 1 10
  source-bridge spanning

This config seems to work just fine - the circuits get all set up and seem
to be happy. But then I reviewed the solution configs and they added this
one line to R2 (right above the first dlsw entries):

source-bridge ring-group 10

Can someone please give me a sanity check on this? I didn't think you
needed a "source-bridge ring-group" command for DLSW+ if you were using
ethernet interfaces - I thought all you needed was the "dlsw bridge-group
x" command.

I just read through the CCO docs on this and couldn't find a straight
answer - one of their examples uses the "source-bridge ring-group x"
command on an ethernet-only router, but that's in the context of SR/TLB.

Ok...wait a minute...I just did a little more searching. In the "Designing
DLSw+ Internetworks" guide:

<http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd2007.htm>

there is a similar example - and they don't use the "source-bridge
ring-group x" command. So now I'm even more confused. Any takers?

Thanks,

Kinton

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