Tlv Information - Cisco 521SG - Unified IP Phone VoIP Administration Manual

Configuring Security, Quality, and Network Features
Configuring VLAN Settings
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
• There is no full validation of all TLVs; TLVs that do not apply to the phones are
ignored.
• Protocol state machines as stated in the standards are only used for
reference.

TLV Information

These sections provide the TLV information.
Chassis ID TLV
For the outgoing LLDPDU, the TLV supports sub-type=5 (Network Address). When
IP address is known, the value of Chassis ID is an octet of the INAN address family
number followed by the octet string for the IPv4 address used for voice
communication. If the IP address is unknown, the value for Chassis ID is 0.0.0.0.
The only INAN address family supported is IPv4. Currently, IPv6 address for the
Chassis ID is not supported. For the incoming LLDPDU, the Chassis ID is treated as
an opaque value to form MSAP identifier. The value is not validated against its sub-
type. The Chassis ID TLV is mandatory as the first TLV. Only one Chassis ID TLV is
allowed for the outgoing and incoming LLDPDUs.
Port ID TLV
For the outgoing LLDPDU, the TLV supports sub-type=3 (MAC address). The 6
octet MAC address for the Ethernet port is used for the value of Port ID in wired or
wireless mode. For the incoming LLDPDU, the Port ID TLV is treated as an opaque
value to form the MSAP identifier. The value is not validated against its sub-type.
The Port ID TLV is mandatory as the second TLV. Only one Port ID TLV is allowed
for the outgoing and incoming LLDPDUs.
Time to Live TLV
For the outgoing LLDPDU, the Time to live TTL value is 180 seconds. This is
different from 120 seconds as recommended by the standard. For the shutdown
LLDPDU, the TTL value is always 0. The Time to Live TLV is mandatory as the third
TLV. Only one Time to Live TLV is allowed for the outgoing and incoming LLDPDUs.
End of LLDPDU TLV
The value is 2-octet, all zero. This TLV is mandatory and only one is allowed for the
outgoing and incoming LLDPDUs.
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