From: Teisberg, Evan (eteisbe@qwest.com)
Date: Tue Dec 03 2002 - 19:03:01 GMT-3
The way I understand it is:
In the "dlsw world", mac-addresses are always in NON-CANONICAL format.
The explorers sent from devices on Ethernet segments are sent in CANONICAL
format.
So, if the requirement is to never send explorers for mac-address
4000.4000.4000, I would say that the following is correct:
dlsw icanreach mac-exclusive
dlsw icanreach mac-address 0200.0200.0200 mask ffff.ffff.ffff
If explorer is sent from an Ethernet device on LAN A, the router
automatically flips the mac to NON-CANONICAL in the "dlsw world", thus
changing it to 0200.0200.0200. It then forwards it across dlsw and it is
flipped back to 4000.4000.4000 on the other router (LAN B) Ethernet segment.
While the explorer is in the "dlsw world" it is address 0200.0200.0200.
The address (0200.0200.0200) needs to be specified in the "dlsw icanreach"
command since you are in the "dlsw world" at this point
Someone please correct me if I'm wrong about this.
Thanks!
-Evan.
-----Original Message-----
From: MOLINA, MARTIN J (PBI) [mailto:mm1343@sbc.com]
Sent: Tuesday, December 03, 2002 12:20 PM
To: 'ccielab@groupstudy.com'
Subject: DLSW ICANREACH/ICANTREACH in a pure Ethernet Environment
Hello,
I'm not sure this post will make it to the group since I have had trouble in
the past but here it goes:
If one were presented with the following requirement:
"Config R4 to peer to R2. Ensure that R2 never sends explorers for
4000.4000.4000 which is the only resource available through R4"
R2 and R4 are Ethernet only. My question is this- If I choose to configure a
DLSW ICANREACH statement on R4 to satisfy this requirement, should the
command be :
dlsw icanreach mac-exclusive
dlsw icanreach mac-address 0200.0200.0200 mask ffff.ffff.ffff
or
dlsw icanreach mac-exclusive
dlsw icanreach mac-address 4000.4000.4000 mask ffff.ffff.ffff
In other words, do I need to bit-swap in an Ethernet only environment?
Thanks in advance
Martin Molina
Senior Network Engineer
SBC (Pacific Bell) Internet Services
CCNP CCDP
desk: (925) 973-7774
cell: (925) 216-5299
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