254
Link Layer Discovery Protocol (802.1ab)
•
Port And Protocol VLAN ID TLV contains the VLAN IDs of the port and
protocol VLANs that contain the local port.
•
VLAN Name TLV contains the VLAN names of the VLANs that contain
the local port.
•
Protocol Identity TLV advertises the protocol supported. The following
values are used for supported protocols on the 4500 Series:
— Stp protocol {0x00,0x26,0x42,0x42,0x03, 0x00, 0x00, 0x00}
— Rstp protocol string {0x00,0x27,0x42,0x42,0x03, 0x00, 0x00, 0x02}
— Mstp protocol string {0x00,0x69,0x42,0x42,0x03, 0x00, 0x00, 0x03}
— Eap protocol string {0x88, 0x8E, 0x01}
— Lldp protocol string {0x88, 0xCC}
IEEE 802.3 organizationally-specific TLVs
The optional IEEE 802.3 organizationally-specifc TLVs are:
•
MAC/PHY Configuration/Status TLV indicates the autonegotiation
capability and the speed and duplex status of IEEE 802.3 MAC/PHYs.
•
Power-Via-MDI TLV indicates the capabilities and current status of IEEE
802.3 PMDs that either require or can provide power over twisted-pair
copper links.
•
Link Aggregation TLV indicates the current link aggregation status of
IEEE 802.3 MACs.
•
Maximum Frame Size TLV indicates the maximum supported 802.3
frame size.
Transmitting LLDPDUs
When a transmit cycle is initiated, the LLDP
manager extracts the managed objects from the LLDP local system MIB
and formats this information into TLVs. TLVs are inserted into the LLDPDU.
LLDPDU are regularly transmitted at a user-configurable transmit interval
(tx-interval) or when any of the variables contained in the LLPDU is modified
on the local system (such as system name or management address).
Tx-delay is "the minimum delay between successive LLDP frame
transmissions."
TLV system MIBs
The LLDP local system MIB stores the information for
constructing the various TLVs to be sent. The LLDP remote systems MIB
stores the information received from remote LLDP agents.
Nortel Ethernet Routing Switch 4500 Series
Overview — System Configuration
NN47205-500
02.01
Standard
5.0
23 February 2007
Copyright © 2007, Nortel Networks
Nortel Networks Confidential
.
