Cisco 521SG - Unified IP Phone VoIP Administration Manual page 150

Configuring Security, Quality, and Network Features
Configuring VLAN Settings
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
Parameter
Enable PC Port VLAN Tagging
PC Port VLAN ID
Enable CDP
Enable LLDP-MED
Network Startup Delay
Description
Enables VLAN and priority tagging on the
phone data port (802. 1 p/q). This feature
facilities tagging of the VLAN ID (802. 1 Q) and
priority bits (802. 1 p) of the traffic coming from
the PC port of the IP phone.
Choose Yes to enable the tagging algorithm.
Defaults to No.
The phone tags all of the untagged frames
coming from the PC. (It does not tag frames
with existing tags). Ranges from 0 to 4095.
Defaults to 0.
Enable CDP only if you are using a switch that
has CDP. CDP is negotiation-based and
determines on which VLAN the IP phone
resides.
Choose yes to enable LLDP-MED for the phone
to advertise itself to devices that use that
discovery protocol. (By default, this setting is
enabled.)
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 is used if
applicable. If CDP is used concurrently, a
waiting period of 6 seconds is used. The
waiting period increases the overall startup
time for the phone.
Enter the delay in seconds for the switch to get
to the forwarding state before the phone sends
out the first LLDP-MED packet. The default
delay is 3 seconds. For configuration of some
switches, it might be necessary 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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