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Cisco Bug: CSCuq68188 - N9K User Defined SVI BIA Mac Limitation

Last Modified

Apr 11, 2018

Products (7)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 9504 Switch
  • Cisco Nexus 3164Q Switch
  • Cisco Nexus 9508 Switch
  • Cisco Nexus 93128TX Switch

Known Affected Releases

6.1(2)I2(2a) 6.1(2)I2(2b) 6.1(2)I2(3)

Description (partial)

When applying user defined BIA mac addresses to SVI's the following is seen and the SVI remains in a 'down (Hardware prog failed); state:

Warning: Vlan 19 interaction with l2fm timed out
2014 Sep  3 14:31:56 N9k-2 %$ VDC-1 %$ %L2FM-1 L2FM_MAX_NUM_CONFIGURABLE_MACS_EXCEEDED: Error: Number of configurable MACs exceeded 16. Unable to program the MAC.

N9k-2(config)# sh int vlan 19
Vlan19 is down (Hardware prog failed), line protocol is down

Symptom:
When applying user defined BIA mac addresses to SVI's the following is seen and the SVI remains in a 'down (Hardware prog failed); state:

Warning: Vlan 19 interaction with l2fm timed out
2014 Sep  3 14:31:56 N9k-2 %$ VDC-1 %$ %L2FM-1 L2FM_MAX_NUM_CONFIGURABLE_MACS_EXCEEDED: Error: Number of configurable MACs exceeded 16. Unable to program the MAC.

N9k-2(config)# sh int vlan 19
Vlan19 is down (Hardware prog failed), line protocol is down

Conditions:
This behavior is seen when a user is configuring user defined BIA mac address on SVI's on a Nexus 9000.  This behavior is seen for each additional interface after exceeding 16 with this configuration.

int vlan #
mac-address HHHH.HHHH.HHHH

When we have VPC peer-gateway enabled, the Nexus 9k's will need to sync/program the custom MACs between the two Nexus 9ks for the peer-gateway feature to work. So the limitation groups both N9Ks together for 16 total BIA MACs
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