From: Solomon Ghebremariam (sghebrem@cisco.com)
Date: Thu Dec 05 2002 - 16:09:00 GMT-3
Scott
What if the segment on R2 is Ether and the segment on R4 is TR and
only 4000.4000.4000 is available on the R4 segment? You would do byte swap
when putting icanreach on R4?
Thanks
Solomon
At 11:53 PM 12/4/2002 -0500, Scott wrote:
>Hmm,
>
>Well riddle me this ;-)....
>
>The only reason the MAC is sent non canonical is because of token ring
>adaptors. If you dont have any token ring, then all bits should be
>outpulsed and read the same. I dont see the need to bit swap in pure
>ethernet environment.
>
>If you are token ring sending me (ethernet) a MAC, then obviously I need to
>read it backwards per byte.
>
>Guess I will go read the source code.
>
>
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>Teisberg, Evan
>Sent: Tuesday, December 03, 2002 5:03 PM
>To: 'MOLINA, MARTIN J (PBI)'; 'ccielab@groupstudy.com'
>Subject: RE: DLSW ICANREACH/ICANTREACH in a pure Ethernet Environment
>
>
>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
.
This archive was generated by hypermail 2.1.4 : Fri Jan 17 2003 - 17:21:39 GMT-3