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New Member

Duplicate MAC Address on Cat4006 L3 Card - Gig3.x & 4.x sub I/faces

We have configured our Cat4006 L3 Card to use HSRP (across 2 L3 switches) and have configured the interfaces on the L3 Card on GigEthernet3 & 4 using sub-interfaces. Works ok but the sub interfaces have the same MAC address as the main Gig Interface. Hence we are getting duplicate MAC address errors.

Is there a Global / Main Interface / or sub interface command that will make each sub-interface have a unique mac address ?

2 REPLIES
Silver

Re: Duplicate MAC Address on Cat4006 L3 Card - Gig3.x & 4.x sub

You can check the following link for HSRP redundancy with unique mac address for each VLAN.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sft_6_1/configgd/redund.htm

New Member

Re: Duplicate MAC Address on Cat4006 L3 Card - Gig3.x & 4.x sub

Well we found the problem. The error mesages were due to the Device having the same MAC address on all Sub interfaces in the L3 Card - but it was our management system which obviously had different IP address settings for the interfaces in the database & hence the MAC address info didn't match up & was compared to another interface (as all sub-interfaces show the same mac address) - the device needed to be re-synced with the management database & the errors stopped.

Easiest way was to delete & recreate/discover the device.

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