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Cisco Bug: CSCut63067 - 8861 Sends Packet With Invalid/Random MAC Address & ASCII Encoded Text

Last Modified

Feb 04, 2017

Products (1)

  • Cisco IP Phone 8800 Series

Known Affected Releases

10.2(2)

Description (partial)

Symptom:
When using MAB (MAC Authentication Bypass) at switch port for authentication 8861 will send "Ethernet II" packet with unknown MAC address and ASCCI Encoded text before receiving EAPOL packet from switch thus causing the port configured with MAB to shutdown as it's in security violation.

Conditions:
Found in customer lab when testing MAB configuration of switchport for 8861. When testing in TAC Lab with no MAB configuration and collecting PCAP from SPAN to PC Port you'll see that "Ethernet II" packet is sent to switch before CDP info with MAC Address.

http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/identity-based-networking-services/config_guide_c17-663759.html#wp9000125
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