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Cisco Bug: CSCsz25478 - IP device tracking table is broken when using web-auth with mac-check

Last Modified

Jan 29, 2017

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)

The IP device tracking table is broken when using web-auth with mac-check.

ACS --- cat2960 -- PC1 (mac: 0000.39c8.d8e5/ ip:
            +- PC2 (mac: 0016.d33a.2395/ ip:

Reproduction Step:
1. Connecting PC1 to FE0/1. >>> MAC Authentication succeeds. 
2. Connecting PC2 which has different mac and same ip to FE0/2.
3. Confirming the IP Device Tracking Table. 

#show ip device tracking all
  IP Address   MAC Address    Vlan Interface         STATE    
------------------------------------------------------------    aaaa.aaaa.aaaa 1     FastEthernet0/2  ACTIVE
 <<<<< Mac address is PC1, but Interface is changed to FE0/2.

4. PC1 temporarily loses the connectivity.

Using web-auth with mac-check
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