From: Gajewski Mariusz (Mariusz.Gajewski@telekomunikacja.pl)
Date: Tue Feb 01 2005 - 05:15:44 GMT-3
Thanks Brian :)
-----Original Message-----
From: Brian McGahan [mailto:bmcgahan@internetworkexpert.com]
Sent: Monday, January 31, 2005 11:13 PM
To: Gajewski Mariusz; ccielab@groupstudy.com
Subject: RE: IELAB 10 pt.13.3-6 , DLSW mac conversion
This address should be bitswapped. The access-list should read:
access-list 700 permit 0080.69C4.5903 0000.0000.0000
The solution has been updated accordingly and has been reposted.
Thanks,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Gajewski Mariusz
> Sent: Monday, January 31, 2005 2:58 PM
> To: ccielab@groupstudy.com
> Subject: IELAB 10 pt.13.3-6 , DLSW mac conversion
>
> Hi everyone,
> I'm sure that subject was talked about but I couldn't find much in
> archives so , if someone could clarify this for me please ? We have
the
> application server that resides on ethernet segment and its mac is
> 0001.9623.9ac0 and we must make sure that R4 only initiates DLSW
peering
> do
> R5 when there is interesting traffic from vlan 43 (ethernet segment on
R4
> )
> destined to the application server. I don't understand why the
solution
> doesn't convert to noncanonical mac-addr .
> I found on doc-cd that :
> ..."When DLSw+ receives a MAC address from an Ethernet-attached
device, it
> assumes it is canonical and converts it to noncanonical for transport
to
> the
> remote peer. At the remote peer, the address is either passed
unchanged to
> Token Ring-attached end systems or converted back to canonical if the
> destination media is Ethernet..."
>
> So my understanding is that when we have something connected to
ethernet
> segment and we block/forward traffic based on the dlsw remote
> dmac-output-list conversion is done automaticly by the router itself ,
> right? But , according to Brian :
> http://forum.internetworkexpert.com/ubbthreads/showflat.php?Cat=
>
<http://forum.internetworkexpert.com/ubbthreads/showflat.php?Cat=&Number
=2
> 45
> 3&page=4&view=collapsed&sb=5&o=&fpart=1>
> &Number=2453&page=4&view=collapsed&sb=5&o=&fpart=1
>
> ..."Conversion is required because the router does an internal bit
swap
> when
> traffic is received in an ethernet interface, then reswapped as it's
sent
> out the destination ethernet interface. The problem with doing the
> icanreach mac address is that the first bitswapping does not occur,
> therefore
when
> the
> explorer is received it's for a different address. In order to fix
this
> problem you must swap the address manually"...
>
> So when doing things with "dlsw remote dmac-output-list " with
ethernet we
> DO NOT convert , but with "dlsw icanreach mac-address" we HAVE TO
convert
> to noncanonical ?
> I'm lost ...
>
> Please clarify,
> Thank you,
>
>
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