topic ASAs with the same MAC addr in Network Security https://community.cisco.com/t5/network-security/asas-with-the-same-mac-addr/m-p/1048583#M878761 <P>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.</P> Mon, 11 Mar 2019 14:26:28 GMT yjdabear 2019-03-11T14:26:28Z ASAs with the same MAC addr https://community.cisco.com/t5/network-security/asas-with-the-same-mac-addr/m-p/1048583#M878761 <P>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.</P> Mon, 11 Mar 2019 14:26:28 GMT https://community.cisco.com/t5/network-security/asas-with-the-same-mac-addr/m-p/1048583#M878761 yjdabear 2019-03-11T14:26:28Z Re: ASAs with the same MAC addr https://community.cisco.com/t5/network-security/asas-with-the-same-mac-addr/m-p/1048584#M878762 <HTML><HEAD></HEAD><BODY><P>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".</P><P></P><P>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?</P><P></P><P><A class="jive-link-custom" href="http://www.cisco.com/en/US/docs/security/asa/asa72/command/reference/m_72.html#wp1780052" target="_blank">http://www.cisco.com/en/US/docs/security/asa/asa72/command/reference/m_72.html#wp1780052</A></P></BODY></HTML> Tue, 16 Dec 2008 14:31:37 GMT https://community.cisco.com/t5/network-security/asas-with-the-same-mac-addr/m-p/1048584#M878762 yjdabear 2008-12-16T14:31:37Z