[c-nsp] where is mac address for a 1720?

[Jared Mauch]

I've seen the mac printed on the bottom of the PCB of some devices when taken apart, as it appears your issue is the embedded mac address is no longer there.

If you're so inclined, check the edges (and undersides) of all the PCBs internally.  If that doesn't work, just program one or manually set it on the interface.  With a few rare exceptions you can use the same mac address on multiple physical interfaces in the same device.  (eg: 6500 has one mac address even if you have hundreds of IP ports).

I would take the mac address of some device on the other side of the world, or another 1720 that would not be placed on the same lan and just clone that one, or the mac of the bluetooth interface on some other machine that will not be speaking ethernet :)

- Jared

On May 11, 2011, at 10:26 AM, Tom Storey wrote:

> I would have thought it would appear somewhere really obvious like in a
> "show interface". The "bia" (burned in address) I would have thought should
> come from the MAC controller of the interface itself, not from a location
> stored elsewhere on the router...?
> 
> 
> On 10 May 2011 18:10, Antonio Querubin <tony at lavanauts.org> wrote:
> 
>> I've had to reset the cookie for a Cisco 1720 which was failing to boot up
>> due to a checksum failure.  Apparently the cookie contents were completely
>> lost.  After resetting the cookie to defaults, it now boots up but because I
>> was unable to locate the MAC address, it's booting up with a MAC of
>> 0000.0000.0000.  Although I can set the MAC to some random set of bits, I'd
>> like to restore the original MAC but can't seem to find it even after
>> popping the cover off.  I'm probably not looking in the right place.  Is the
>> MAC not printed anywhere on the device?  A google search doesn't turn up any
>> hints of where it might be.
>> 
>> Antonio Querubin
>> e-mail:  tony at lavanauts.org
>> xmpp:  antonioquerubin at gmail.com
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