Cisco 521SG - Unified IP Phone VoIP Administration Manual page 148

Configuring Security, Quality, and Network Features
Configuring VLAN Settings
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
QoS Resolution for LLDP-MED
If CoS is applicable and if CoS=0, the default will be used for the specific
extension as previously described. But the value shown on L2 Priority for TLV for
outgoing LLDPDU is based on value used for extension 1. If CoS is applicable and
if CoS != 0, CoS will be used for all extensions.
If DSCP (mapped to ToS) is applicable and if DSCP=0, the default will be used for
the specific extension as previously described. But the value show on DSCP for
TLV for outgoing LLDPDU is based on value used for the extension 1. If DSCP is
applicable and if DSCP != 0, DSCP will be used for all extensions.
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 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 voice application from LLDP-MED PDU and if
the tagged flag is not set, only the DPSC (mapped to ToS) is applicable.
For the Cisco SPA525G/525G2, when the VLAN is changed, the user sees the
voice component refreshed when IP address is changed. For the Cisco SPA50X,
the phone reboots and restarts the fast start sequence.
Co-Existence with CDP
If both CDP and LLDP-MED are enabled, the network policy for the VLAN is
determined by 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
both CDP and LLDP-MED PDUs at the same time.
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 via CDP and LLDP-MED, the VLAN ID that is configured
manually is used. If the VLAN ID is not configured manually, no VLAN will be
supported. DSCP is used and the network policy is determined by LLDP-MED if
applicable.
Wireless LAN Environments
Network policy for the VLAN feature is not supported for wireless networks. The
Wireless AP or Wireless router must be enabled for LLDP-MED as the Network
Connectivity Device. The DSCP portion for network policy from Wireless AP/
Router will be supported if enabled.
5
147