I could write a couple pages on this, but try and give you a quick run
down. I would suggest that you do some more reading on the subject though.
EXAMPLE TOPOLOGY:
Host1--Ring8---Bridge1---Serial Link-----Bridge2----Ring9----Host2
RSRB is passthrough for the RIF, in order for it to work, you have to make a
virtual ring on both Bridge 1 and Bridge 2, the virtual ring number must be
the same on both sides of the link. The RIF go completely through from
Ring8 to Bridge 1 to VR to Bridge 2 to Ring 9. It wouldn't get broken up.
Say we used Virtual Ring # 10, then the RIF that Host 2 sees might look like
this:
0830 0081 00A2 0090
DLSW is not passthrough, this is an advantage since you can increase the hop
count since you could have 7 bridges on each side of the WAN link. In this
case you create 2 virtual rings, one on each of the bridges, unlike RSRB
they do not have to have the same number. The bridges would be peered to
each other, and Host 2 would only see the RIF that consisted of Virtual
Ring, Bridge 2, Ring9, it won't see any of the RIF on the other side of the
WAN link. Say we used Virtual Ring #10 on Bridge 1 and Virtual Ring #11 on
bridge 2, the RIF that Host 2 might see might look like this:
0630 00B2 0090
Hope this helps out some, but again, I would recommed that you do more
reading on it. There is a book by Caslow called Routers, Bridges, and
Switches for CCIE's and it has a very good write up in there...either
chapter 20 or 21.
Good Luck,
Bill
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=18024&t=17894
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