ASAs with the same MAC addr

Unanswered Question
Dec 16th, 2008

I'm running into a problem with a pair of ASAs using the same MAC addr. This confuses the heck out of a third-party network management tool that apparently uses MAC addr as a unique device ID, so it keeps thinking one is the other. The two ASAs are not in any kind of failover setup, so that's one less reason they should have the same MAC addr. I vaguely recall hearing about Cisco re-using MAC addrs on devices. It doesn't matter why or how. I'm just interested in how to identify where this MAC addr is set on the ASAs and how to get it changed on one ASA (if possible) without interrupting service.

I have this problem too.
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yjdabear Tue, 12/16/2008 - 06:31

The ASAs have multiple contexts. I don't see any "mac address" in "system" or the admin context configs. I don't see any overlap in "show interface" or the "MAC Address Ranges" of "show module".

Can I use "mac address phy_if [active_mac] [standby_mac]" mentioned in the link below to change the MAC addr once it's located?


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