Static MAC Address Configuration

[gohcw]

Hi I try to configure the static MAC Address on the Cisco Nexus N9000, but it prompts the error message "Invalid MAC: multicast/broadcast not supported!". Is any expert know why prompt this error message

CoreSW01(config)# mac address-table static 03bf.c009.c818 vlan 200 interface Ethernet1/2

Invalid MAC: multicast/broadcast not supported!

CoreSW01(config)# mac address-table static 03bf.c009.c8f0 vlan 200 interface ethernet 1/2

Invalid MAC: multicast/broadcast not supported!

[Mark Elsen]

  - @gohcw   Checkout if this can help for your context too  :
                             https://community.cisco.com/t5/other-data-center-subjects/nexus-93180yc-ex-cant-configure-static-arp-for-microsoft-nlb/m-p/4041713/highlight/true#M8841

  M.

[Jens Albrecht · Accepted solution]

Hello @gohcw,

the MAC address 03bf.c009.c818 is a multicast address, not vendor-assigned, and commonly generated by Microsoft Network Load Balancing (NLB) in multicast mode.

The rule is simple. If the lowest bit of the first byte (here, hex '03', binary '00000011') is set, the address is interpreted as a multicast address.

Therefore, Cisco devices are correct in classifying it as a multicast address.

So you need to follow the steps to enable Multicast NLB on your Nexus switch as explained in the thread referenced by @Mark Elsen.

HTH!

[gohcw]

Hi

So I can just ignore this config and no need migrated this config from Catalyst 3850 to the Nexus N9K. Please correct if I am wrong

Best Regards. 

Cheers