Cisco 521SG - Unified IP Phone VoIP Administration Manual page 229

Cisco SPA IP Phone Field Reference
System Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
Parameter
PC Port VLAN Highest
Priority
PC Port VLAN ID
Enable CDP
Enable LLDP-MED
Network Startup Delay
Description
0-7 (default 0). The priority applied to all frames,
tagged and untagged. The phone modifies the
frame priority only if the incoming frame priority is
higher than this value.
0-4095 (default 0). Value of the VLAN ID. The
phone tags all the untagged frames coming from
the PC (it will not tag frames with an existing tag).
Enable CDP only if you are using a switch that has
Cisco Discovery Protocol. CDP is negotiation
based and determines which VLAN the IP phone
resides in.
Choose yes to enable LLDP-MED for the phone to
advertise itself to devices that use that discovery
protocol.
When the LLDP-MED feature is enabled, after the
phone has initialized and Layer 2 connectivity is
established, the phone sends out LLDP-MED PDU
frames. If the phone receives no
acknowledgment, the manually configured VLAN
or default VLAN will be used if applicable. If the
CDP is used concurrently, the waiting period of 6
seconds is used. The waiting period will increase
the overall startup time for the phone.
Setting this value causes a delay for the switch to
get to the forwarding state before the phone will
send out the first LLDP-MED packet. The default
delay is 3 seconds. For configuration of some
switches, you might need to increase this value to
a higher value for LLDP-MED to work. Configuring
a delay can be important for networks that use
Spanning Tree Protocol.
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