LLDP-MED Extended Power-Via-MDI TLV
In the TLV for the outgoing LLDPDU, the binary value for Power Type is set to “0 1” to indicate the power
type for phone is PD Device. The Power source for the phone is set to “PSE and local” with binary value “1
1”. The Power Priority is set to binary “0 0 0 0” to indicate unknown priority while the Power Value is set to
maximum power value. The Power Value for the Cisco IP Phone is 12900mW.
For the incoming LLDPDU, the TLV is ignored and not validated. Only one TLV is allowed in the outgoing
and incoming LLDPDUs. The phone will send out the TLV for the wired network only.
The LLDP-MED standard was originally drafted in the context of Ethernet. Discussion is ongoing for
LLDP-MED for Wireless Networks. Refer to ANSI-TIA 1057, Annex C, C.3 Applicable TLV for VoWLAN,
table 24. It is recommended that the TLV is not applicable in the context of the wireless network. This TLV
is targeted for use in the context of PoE and Ethernet. The TLV, if added, will not provide any value for
network management or power policy adjustment at the switch.
LLDP-MED Inventory Management TLV
This TLV is optional for Device Class III. For the outgoing LLDPDU, we support only Firmware Revision
TLV. The value for the Firmware Revision is the version of firmware on the phone. For the incoming LLDPDU,
the TLVs are ignored and not validated. Only one Firmware Revision TLV is allowed for the outgoing and
incoming LLDPDUs.
Final Network Policy Resolution and QoS
Special VLANs
VLAN=0, VLAN=1, and VLAN=4095 are treated the same way as an untagged VLAN. Because the VLAN
is untagged, Class of Service (CoS) is not applicable.
Default QoS for SIP Mode
If there is no network policy from CDP or LLDP-MED, the default network policy is used. CoS is based on
configuration for the specific extension. It is applicable only if the manual VLAN is enabled and manual
VLAN ID is not equal to 0, 1, or 4095. Type of Service (ToS) is based on configuration for the specific
extension.
QoS Resolution for CDP
If there is a valid network policy from CDP:
• If the VLAN=0, 1, or 4095, the VLAN will not be set, or the VLAN is untagged. CoS is not applicable,
but DSCP is applicable. ToS is based on the default as previously described.
• 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.
• The phone reboots and restarts the fast start sequence.
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
58
Cisco IP Phone Installation
LLDP-MED Extended Power-Via-MDI TLV
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