From: Sean C (Upp_and_Upp@hotmail.com)
Date: Tue Sep 27 2005 - 10:07:42 GMT-3
Bhuiyan
Great info!! In a couple of CCIE classes I attended, this always came up -
'Was there some way to have the router do the conversion?', and the answer
was always universally 'no' - both from other students and teachers. Yes, I
know how to swap the digits, but when $1250 may be on the line, any way to
verify the conversion gives some piece of mind (and saves valuable minutes).
Your solution makes sense.
And, of course, I find this out just when Cisco is pulling dlsw off of the
lab! ;-)
Thanks again,
Sean
----- Original Message -----
From: "Bhuiyan Muhaimeen" <bmuhaime@cisco.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, September 27, 2005 5:06 AM
Subject: IOS canonical to canonical MAC conversion.
> Hi Team,
>
> Just wanted to share something that I came upondont know if every body
> is aware of thisbut looks like IOS has a built in bit swapping tool for
> converting canonical to non-canonical..
>
> Heres how it goessay for a dlsw icanreach address you need to find the
> non-canonical of the following two MAC addresses:
>
> 4000.4000.4000
> And
> 4000.4000.4001
>
> Instead of the tedious bit swapping and binaries, let the router do
> it..heres how:
>
> 1. turn on dlsw transparent switch support globally(you need to do this
> before bridge group stuff as they are not compatible with each other)
>
> R7(config)#dlsw transparent switch-support
>
> 2. Enable a multicast MAC under the Ethernet
>
> R7(config)#int e0/0
> R7(config-if)#dlsw transparent redundancy-enable 0100.5e12.2342
> <<<Multicast MAC (use whatever you like)
>
> 3. Under the transparent MAP config, use the MAC address you want to
> convert:
>
> R7(config-if)#dlsw transparent map local-mac 4000.4000.4000 remote-mac
> 4000.4000.4001
> R7(config-if)#end
>
> 4. Do a 'show dlsw transparent map', you get the non-canonical MAC:
>
> R7#sh dlsw transparent map
>
> Interface Et0/0
> LOCAL Mac REMOTE MAC BACKUP
> --------- ---------- ------
> 0200.0200.0200 0200.0200.0280 STATIC
>
> 5.Turn off the transparent switch support globally and then on the
> interface (you need to do that to configure the bridge group stuff)
> R7#ct
> Enter configuration commands, one per line. End with CNTL/Z.
> R7(config)#no dlsw transparent switch-support
> R7(config)#end
> R7#sh run int e0/0
> Building configuration...
>
> Current configuration : 152 bytes
> !
> interface Ethernet0/0
> ip address 138.10.70.7 255.255.255.0
> dlsw transparent redundancy-enable 0100.5e12.2342
> end
>
> R7#ct
> Enter configuration commands, one per line. End with CNTL/Z.
> R7(config)#int e0/0
> R7(config-if)#no dlsw transparent redundancy-enable 0100.5e12.2342
> R7(config-if)#exit
>
> HTH,
>
> -Bhuiyan
>
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