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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