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Cisco Bug: CSCum03537 - 6921 phones with OUI 0c2724 are appearing as Un-Classified Device

Last Modified

Feb 12, 2018

Products (88)

  • Cisco Catalyst 3750-X Series Switches
  • Cisco Catalyst 2960S-24PD-L Switch
  • Cisco Catalyst 3560X-48T-E Switch
  • Cisco Catalyst 2960S-F48FPS-L Switch
  • Cisco Catalyst 3560X-48U-S Switch
  • Cisco Catalyst 3560X-48P-S Switch
  • Cisco Catalyst 3560CG-8TC-S Compact Switch
  • Cisco Catalyst 2960C-12PC-L Switch
  • Cisco Catalyst 2960C-8TC-S Switch
  • Cisco Catalyst 3750X-24T-S Switch
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Known Affected Releases

15.2(1)E

Description (partial)

Symptom:
On 3750X running 15.2(1)E, 
Cisco IP-Phones 6921 are not being detected, showed as Un-Classified Device:

NFAPNYWEST3750#sho macro auto monitor device
Summary:

MAC_Address       Port_Id       Profile Name                        Device Name
==============    ==========    ===============================     =======================
0021.ccd3.fe61    Gi2/0/1       Un-Classified Device                Unknown Device
001d.a219.d1bd    Gi2/0/40      Cisco-IP-Phone                      Cisco IP Phone 7941
c067.af58.c444    Gi1/0/29      Un-Classified Device                cisco AIR-CAP2602I-A-K9
0007.0e6d.b7a5    Gi1/0/6       Cisco-IP-Phone                      Cisco IP Phone 7941
0c27.2455.1700    Gi1/0/25      Un-Classified Device                Cisco IP Phone 6921  <<<<<
001d.450b.e3ae    Gi2/0/6       Cisco-IP-Phone                      Cisco IP Phone 7941
0007.0e6d.12ab    Gi1/0/4       Cisco-IP-Phone                      Cisco IP Phone 7941
0c27.2455.26c2    Gi1/0/27      Un-Classified Device                Cisco IP Phone 6921  <<<<<<
0024.c4bf.2619    Gi2/0/25      Cisco-IP-Phone                      Cisco IP Phone 7941
0021.ccd0.219a    Gi2/0/34      Un-Classified Device                Unknown Device
0007.0e6d.b6c4    Gi2/0/2       Cisco-IP-Phone                      Cisco IP Phone 7941
5c26.0a09.eb7d    Gi2/0/42      Un-Classified Device                Unknown Device
5c26.0a09.f169    Gi1/0/9       Un-Classified Device                Unknown Device
0c27.2455.271f    Gi1/0/36      Un-Classified Device                Cisco IP Phone 6921  <<<<<<<

Conditions:
6921 phones with OUI 0c2724
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