From: Justin Menga (Justin.Menga@xxxxxxxxxxxxxxxxxx)
Date: Wed Dec 06 2000 - 16:38:19 GMT-3
If you draw it out logically it looks like this:
Ring 1 ---- R1 ---- Virtual Ring X ---- R2 ---- Virtual Ring Y ---- R3 ----
Ring 3
|
Ring 2
If R1 and R2 are running DLSW, the Virtual Ring X do not need to be the same
on both routers. If a host on Ring 2 needs to communicate with Ring 1, an
explorer is sent. R2 will send CANUREACH_ex (explorers) to R1. R1 will
respond ICANREACH_ex. R2 will return a RIF to the host on Ring 2 of 0610
0022 XXX0 (where XXX is the Virtual Ring X) - note that information
regarding R1 topology is not included. R1 will build a RIF to the
destination host of 0610 XXX1 0010 .
If you are using Passthru, X must be the same on R1 and R2. In this case R2
will return a RIF of 0810 0022 XXX1 0010 and this will propagate through to
R1 unchanged.
If you are using RSRB between R2 and R3, you must use same ring Y on both R2
and R3.
Regards,
Justin Menga MCSE+I CCNP CCSE ASE
WAN Specialist
Computerland New Zealand
PO Box 3631, Auckland
DDI: (+64) 9 360 4864 Mobile: (+64) 25 349 599
mailto: justin.menga@computerland.co.nz
-----Original Message-----
From: Wu, Jiang [mailto:wujiang@bj163.com]
Sent: Monday, 4 December 2000 6:52 p.m.
To: ccielab@groupstudy.com
Subject: Another silly question
Hi group,
I am learning dlsw but I have no physical token ring interface in my
routers. So don't laugh if it may be a simple question. I do not understand
the function of RIF passthru feature very well. What is the difference
between RIF passthru and RSRB? For example,
ring#1---R1---R2---ring#2---R3---ring#3
R1 and R2 are dlsw peers, R3 works as SR bridge. Then hosts on ring#1 can
visit those on #2 and #3. When the topology changes to
ring#1---R1---R2---R3---ring#3
|
ring#2
R1 to R2 is the same. R2 and R3 are connected via RSRB. I GUESS the three
rings can visit each other. But I am not sure if I need to configure two
ring-groups on R2 for dlsw and rsrb. Forther more, if change R2 and R3 to
dlsw peers, ring#1 cannot visit #3 since R1 and R3 are not peers. I wonder
if configuring RIF passthru for R2 and R3 can make hosts on ring#1 visiting
#3.
Thanks in Advance,
Wu
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