RE: DLSw+ Translation Between Ethernet and Token Ring

From: ccie candidate (ccie1@xxxxxxxxx)
Date: Sun Aug 18 2002 - 18:21:25 GMT-3

   
i believe you dont need that command if the peer is only havig ethernet ,only D
lsw bridge-group number is need .

i have tested this and it worked fine .. 

--

On Sun, 18 Aug 2002 17:30:14
 Phil wrote:
> I would like to see that either. Unfortunatelly, I sold my Token Ring routers
 after I passed and have left only 2 2516. If someone can build up a lab and co
nfirm That would be great. I myself agree it is not needed.
>Phil
>
>  Jim Brown <Jim.Brown@caselogic.com> escreveu: It looks like an extraneous co
mmand left in the documentation example. It is
>even the same in the 12.2 docs?
>
>You wouldn't get the points in the lab if you configured DLSW+ based on the
>docs in this example, I'd put money on it.
>
>Somebody please correct me if I'm wrong, but you don't need the source
>bridge ring-group command on an Ethernet only DLSW+ peer.
>
>-----Original Message-----
>From: Frank B [mailto:frank@buff-net.com]
>Sent: Sunday, August 18, 2002 1:34 PM
>To: 'Phil'; 'Jon O'Nan'
>Cc: ccielab@groupstudy.com
>Subject: RE: DLSw+ Translation Between Ethernet and Token Ring
>
>
>Well I'm confused...if the RIF is terminated locally, the token-ring
>router (Router B in this example) never knows the RIF info from the
>other end anyway. It should never know the existence of the virtual
>ring at the other end. And since DLSW+ takes care of the bit-swapping
>based on the destination media (assuming Ethernet to be canonical, DLSW+
>transports it as non-canonical) I don't see how the virtual ring is
>being used here?
>
>Secondly, source-route bridge-group is actually a SRB command. I
>believe you need the interface command source-bridge ring bridge
>virtual-ring in order to use the virtual ring for SRB. Why you need it
>in DLSW+ is the router uses SRB to the virtual ring where DLSW+ picks it
>up. The dlsw bridge-group bridge-group-number command is how the
>Ethernet segment is introduced to DLSW+ as described in the last
>paragraph.
>
>Therefore I don't believe it's required either! Could it be a typo?
>
>Here's a different opinion, another Cisco link explicitly states that
>it's not required:
>
>http://www.cisco.com/warp/public/701/45.html
>
>"Note: source-bridge ring-group on router B is not needed."
>
>This example has no SR/TLB...just token-ring on Router A and Ethernet on
>Router B--essentially the same though.
>
>If someone has some actual data disproving my theory I'm really
>interested in seeing it...Man, I just thought I was beginning to catch
>on ;-)
>Tossing in my 2 cents. Aloha, Frank
>
>
>
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Phil
>Sent: Sunday, August 18, 2002 7:05 AM
>To: Jon O'Nan; ccielab@groupstudy.com
>Subject: Re: DLSw+ Translation Between Ethernet and Token Ring
>
>Jon,
>Ring 31 is needed to represent the ethernet segment to the TokenRing
>world. Without it htere will be no way to have packet exchange between
>the tokenring and ethernet segments.
>Phil
>
>Jon O'Nan escreveu: Can someone explain to
>me why a virtual ring is needed on Router A - the dlsw
>peer with the ethernet segment.
>
>Thanks
>Jon
>
>
>http://cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ibm_
>c/bcp
>rt2/bcddlsw.htm#36509
>
>
>------------------------------------------------------------------------
>---
>
>Router A
>
>
>
>hostname Router A
>!
>.
>.
>.
>source-bridge ring-group 31
>dlsw local-peer peer-id 128.207.111.1
>dlsw remote-peer 0 tcp 128.207.1.145
>dlsw bridge-group 5
>!
>interface loopback 0
>ip address 128.207.111.1 255.255.255.0
>interface Ethernet 0
>no ip address
>bridge-group 5
>!
>.
>.
>bridge 5 protocol ieee
>!
>.
>
>Router B
>
>
>
>hostname Router B
>!
>.
>.
>.
>source-bridge ring-group 500
>source-bridge transparent 500 1000 1 5
>dlsw local-peer peer-id 128.207.1.145
>dlsw remote-peer 0 tcp 128.207.111.1
>dlsw bridge-group 5
>.
>.
>interface loopback 0
>ip address 128.207.1.145 255.255.255.0
>interface ethernet 1/2
>no ip address
>bridge-group 5
>
>.
>.
>.
>interface tokenring 2/0
>no ip address
>ring-speed 16
>source-bridge 7 1 500
>source-bridge spanning
>!
>.
>.
>.
>bridge 5 protocol ieee

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