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Neighbor Discovery Overview
Figure 13-3
LLDP_Multicast
address
6 octets
Chassis ID TLV
M = Mandatory TLV (required for all LLDPDUs)
Each LLDPDU frame can also contain the following optional TLVs:
•
Port Description — The port from which the LLDP agent transmitted the frame.
•
System Name — The system's administratively assigned name.
•
System Description — Includes the system's name, hardware version, OS level, and
networking software version.
•
System Capabilities — A bitmap that defines the primary functions of the system. The
currently defined capabilities include, among other things, WLAN access point, router, and
telephone.
•
Management Address — The IP or MAC address associated with the local LLDP agent that
may be used to reach higher layer entities.
An LLDPDU frame can also contain the following extension TLVs:
•
802.1 VLAN extension TLVs describe attributes associated with VLANs:
–
–
–
–
•
802.3 LAN interface extensions TLVs describe attributes associated with the operation of an
802.3 LAN interface:
–
–
–
13-6 Configuring Neighbor Discovery
Frame Format
DA
SA
Ethertype
MAC
88-CC
address
6 octets
2 octets
Time to Live
Port ID TLV (M)
(M)
Port VLAN ID — Allows a bridge port to advertise the port's VLAN identifier (PVID) that
will be associated with untagged or priority tagged frames it receives.
Port & Protocol VLAN ID — Allows a bridge to advertise whether it supports protocol
VLANs and, if so, what VLAN IDs these protocols will be associated with.
VLAN Name — Allows a bridge to advertise the textual name of any VLAN with which it
is configured.
Protocol Identity — Allows a bridge to advertise the particular protocols that are
accessible through its port.
MAC/PHY Configuration/Status — Advertises the bit-rate and duplex capability of the
sending 802.3 node, the current duplex and bit-rating of the sending 802.3 node, and
whether these settings were the result of auto-negotiation during link initiation or manual
override.
Power-Via-MDI — Advertises the power-via-MDI capabilities of the sending 802.3 node.
Link-Aggregation — Advertises whether the link is capable of being aggregated, whether
it is currently in an aggregation, and, if it is in an aggregation, the port of the aggregation.
IEEE 802.3 LLDP frame format
LLDP
LLDPDU format
Optional TLV
TLV (M)
Data + pad
LLDPDU
1500 octets
...
Optional TLV
FCS
4 octets
End of LLDPDU
TLV (M)
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