From: Brian McGahan (brian@xxxxxxxxxxxxxxx)
Date: Sat May 04 2002 - 17:12:59 GMT-3
Curtis,
Rings on the 3920 are set to SRB by default. This means that
traffic without a RIF will be dropped. The "multiring" command
generates a RIF for your layer-3 traffic. If you want to source route
your layer 3 traffic over the 3920, then you need a RIF, hence you need
the "multiring" command. If you set the rings on the 3920 to do SRT,
then you don't necessarily need the "multiring" command. SRT with
source route the traffic if there is a RIF, and transparently bridge the
traffic if there is no RIF. Therefore, by default, if you have this
setup:
R1-To0--Ring1--3920--Ring2--To0-R2
R1 and R2's Token interfaces are in the same IP subnet, but different
rings, you need to use the "multiring ip" command to bridge traffic
across the 3920. If these rings are set to SRT, then you don't
necessarily need the "multiring" command.
If you have this setup:
R1-To0--Ring1--3920--Ring1--To0-R2
R1 and R2's Token interfaces are still in the same IP subnet, but now in
the same ring, you do not need the "multiring" command. Since they are
both on the same ring, there is no bridging required, hence no RIF
required.
Remember that if you are running IPX over the token with SRB, you need
the "multiring IPX" command. If you are running IS-IS over the token
with SRB, you need the "multiring CLNS" command. "multiring all" will
cover all of these cases.
HTH
Brian McGahan
CCIE #8593
brian@cyscoexpert.com
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Curtis Phillips
Sent: Saturday, May 04, 2002 11:16 AM
To: ccielab@groupstudy.com
Subject: Clarification on the use of multiring on TR intefaces
Hello All,
My understanding the use of multiring is to enable a router to build
rifs. I
am somewhat confused as to when precisely this must be done. Is it only
when
the TR interface is connected to end-stations without additional bridges
attached or ? Any clarification of this concept is appreciated.
Curtis
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