ipv6 eui-64 address

How do i find my routers Mac address.
When i use the ipv6 address x

::/64 eui-64 command the router generates the
eui-64 address from the routers mac address.I've been searching but i cant find where
the mac is specified.A basic question but its wrecking my head.

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PCHoldmann

"Show interfaces" will show the MAC addresses on all ethernet interfaces. "sh ipv6 interface brief" shows the assigned EUI-64 addresses

Webmaster

I think he mean the base mac address of the router itself.

What you need Ed, is a cookie.

Run cookie in rommon, skip the first 4 characters, then the next 12 is the base mac address of the router itself burned into the mainboard at manufacturing.

rommon 1 > cookie

cookie:
01 01 00 04 c1 29 9c 40 43 20 00 ff 00 91 00 20
00 00 00 00 00 00 00 00 4a 41 44 04 51 30 4a 31
31 02 03 00 00 00 00 00 00 ff ff ff 60 06 49 0b
17 0d ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
rommon 2 >

EdTheLad

Thats great, thanks a million Johan!

EdTheLad

PCHoldmann wrote:

"Show interfaces" will show the MAC addresses on all interfaces ethernet interfaces. "sh ipv6 interface brief" shows the assigned EUI-64 addresses

"show interfaces" i wish

On my first read i was thinking the mac was taken from the actual interface, but i was wondering what happens with regard to the serial.After close inspection i realized the same interface-id is used for all interfaces which is created using the routers base mac address.

Webmaster

You're most welcome Ed

PCHoldmann

Ok, so I answered the wrong question...

Depending on the platform, this info may also be available the the show cXXXX (i.e. show c3600 on a 3600), show diag (3800), show catalyst6000 (6500), etc. I have noticed inconsistant output on these (show c1700 doesn't have it), results may vary.