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Cisco Bug: CSCvt21647 - 2960L Static mac address not programmed on the hardware with ether-channels

Last Modified

Jun 10, 2020

Products (1)

  • Cisco Catalyst 2960-L Series Switches

Known Affected Releases

15.2(7)E

Description (partial)

Symptom:
once we configure as static mac on the EC the traffic stops to that mac

sw-2NadDesno213Zg#p 192.168.70.26 rep 1000
Type escape sequence to abort.
Sending 1000, 100-byte ICMP Echos to 192.168.70.26, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

sw-2NadDesno213Zg#sh mac add add 0077.8df8.842c
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
201    0077.8df8.842c    DYNAMIC     Po2


sw-2NadDesno213Zg(config)#mac address-table static 0077.8df8.842c  vlan 201 interface port-channel 2


sw-2NadDesno213Zg#p 172.30.201.176
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.30.201.176, timeout is 2 seconds:
.....

Conditions:
- MAC address is statically configured for etherchannel interface. 
- 2960L device.
- 15.2(7)E0a

Dynamic MAC: 

w-2NadDesno213Zg#sh platform  port-asic fdb-shadow-table | i 00:77:8D:F8:84:2C
7720    0  00:77:8D:F8:84:2C    201     Ch 0/2          0       1       0       0       5   1

Once MAC statically configured, the mac is not appearing in hardware. 

sw-2NadDesno213Zg#sh platform  port-asic fdb-table | i 00:77:8D:F8:84:2C
<no output>
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