From: Bob Chahal (bob.chahal@xxxxxxxxxxxx)
Date: Mon Aug 27 2001 - 06:34:01 GMT-3
Voller,
f=care, 0=don't care in the mask on the icanreach statement. If you want to
match only those mac addresses that beigin with 0001.0001.xxxx where x is
any hex digit then the statement should be
dlsw icanreach mac-address 0001.0001.0000 mask ffff.ffff.0000
See the leink below and watch any wrap.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/ibm_r
/brprt2/brdlsw.htm#xtocid2671113
If what I've detailed above is your requirement then during DLSW peer
negotion R1 informs R2 through capabaility exchange that only mac addresses
0001.0001.xxxx are reachable via R1 and that explorers for any other mac
address should not be directed to R1. It also negates the need for R2 to
send explorers for any mac address in the range 0001.0001.xxxx. A great
resource for DLSW+ is
http://www.cisco.com/warp/public/cc/pd/ibsw/ibdlsw/prodlit/dlswa_rg.pdf
Have fun!
Bob
----- Original Message -----
From: <Voller.Lam@Level3.com>
To: <ccielab@groupstudy.com>
Sent: Monday, August 27, 2001 3:44 AM
Subject: DLSW icanreach
> Hi group,
>
> I have a question about DLSW+ icanreach. The diagram is shown as below:
>
> DLSW+
> Host 1 -- Token Ring 1 -- R1 --------------------------- R2
>
> The loopback addresses of R1 and R2 are 192.168.100.1 and 192.168.100.2
> respectively.
>
> Configuration of DLSW+ of R1:
> dlsw local-peer peer-id 192.168.100.1
> dlsw remote-peer 0 tcp 192.168.100.2
> dlsw icanreach mac-exclusive
> dlsw icanreach mac-address 0001.0001.0000 mask 0000.0000.ffff
>
> Configuration of DLSW+ of R2:
> dlsw local-peer peer-id 192.168.100.2
> dlsw remote-peer 0 tcp 192.168.100.1
>
> My question is that does a host (Host 1) with mac address 1.1.1 on Token
> Ring 1 send the explorer frames to R2?
> My understanding is since R1 had been configured with icanreach
> mac-exclusive, when R1 received explorer frames from Token ring 1, R1 will
> neglect this explorer frames.
>
> If my understanding for that is right, how about the same configuration
> except no icanreach mac-exclusive command on R1?
> Will R1 send explorer frames to R2 when it receives explorer frames from
> token ring 1.
>
> Please comment and give me some help.
>
> Many thanks,
> Voller
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