Coexistence With Cdp - Cisco 8851 Administration Manual

VLAN Settings
If the VLAN > 1 and VLAN < 4095, the VLAN is set accordingly. CoS and ToS are based on the default as
previously described. DSCP is applicable.
If there is a valid network policy for the voice application from LLDP-MED PDU and if the tagged flag is
set, the VLAN, L2 Priority (CoS), and DSCP (mapped to ToS) are all applicable.
If there is a valid network policy for the voice application from LLDP-MED PDU and if the tagged flag is
not set, only the DSCP (mapped to ToS) is applicable.
The Cisco IP Phone reboots and restarts the fast start sequence.

Coexistence with CDP

If both CDP and LLDP-MED are enabled, the network policy for the VLAN determines the last policy set or
changed with either one of the discovery modes. If both LLDP-MED and CDP are enabled, during startup
the phone sends CDP and LLDP-MED PDUs.
Inconsistent configuration and behavior for network connectivity devices for CDP and LLDP-MED modes
could result in an oscillating rebooting behavior for the phone due to switching to different VLANs.
If the VLAN is not set by CDP and LLDP-MED, the VLAN ID that is configured manually is used. If the
VLAN ID is not configured manually, no VLAN is supported. DSCP is used and the network policy determines
LLDP-MED if applicable.
LLDP-MED and Multiple Network Devices
You can use the same application type for network policy. However, phones receive different Layer 2 or Layer
3 QoS Network policies from multiple network connectivity devices. In such a case, the last valid network
policy is accepted.
LLDP-MED and IEEE 802.X
The Cisco IP Phone does not support IEEE 802.X and does not work in a 802.1X wired environment. However,
IEEE 802.1X or Spanning Tree Protocols on network devices could result in delay of fast start response from
switches.
Configure VLAN Settings
Procedure
Step 1
In the phone web user interface, navigate to Admin Login > advanced > Voice > System.
Step 2 In the VLAN Settings section, configure the fields.
Step 3 Click Submit All Changes.
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
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