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Cisco Bug: CSCup90022 - 8831 accepts untagged DHCP Offer after sending Discover on Voice VLAN

Last Modified

Mar 20, 2018

Products (2)

  • Cisco Unified IP Phone 6900 Series
  • Cisco Unified IP Conference Phone 8831

Known Affected Releases

9.3(3)

Description (partial)

Symptom:
- 8831 displays "Phone not registered"
- 8831 is getting an IP address on a VLAN other than the voice VLAN

Conditions:
- Phone's switchport is configured with both "switchport voice vlan" and "switchport access vlan"
- Two different DHCP servers are used for the data and voice VLANs, and the DHCP servers are not VLAN aware
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  • Status
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