4000 Router Series Layer 2 - LAN Switching Configuration Guide

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By default, management addresses are encoded in numeric format. If a neighbor encodes its

management address in character string format, you must configure the encoding format of the

management address as string on the connecting port to guarantee normal communication with the

neighbor.

To configure a management address to be advertised and its encoding format on a port:

Step Command Remarks

1. Enter system view.

system-view N/A

2. Enter Layer 2 or Layer 3

Ethernet interface view.

interface interface-type

interface-number

N/A

3. Allow LLDP to advertise the

management address in

LLDPDUs and configure the

advertised management

address.

lldp [ agent { nearest-customer |

nearest-nontpmr } ] tlv-enable

basic-tlv management-address-tlv

[ ip-address ]

By default, nearest bridge agents

and nearest customer bridge

agents can advertise the

management address in LLDPDUs,

and nearest non-TPMR bridge

agents cannot advertise the

management address in LLDPDUs.

4. Configure the encoding

format of the management

address as character string.

lldp [ agent { nearest-customer |

nearest-nontpmr } ]

management-address-format

string

By default, the management

address is encapsulated in the

numeric format.

Setting other LLDP parameters

The TTL TLV carried in an LLDPDU determines how long the device information carried in the LLDPDU can

be saved on a recipient device.

By setting the TTL multiplier, you can configure the TTL of locally sent LLDPDUs, which determines how

long information about the local device can be saved on a neighboring device. The TTL is expressed by

using the following formula:

TTL = Min (65535, (TTL multiplier × LLDPDU transmit interval))

As the expression shows, the TTL can be up to 65535 seconds. TTLs greater than 65535 will be rounded

down to 65535 seconds.

Follow these guidelines when you change LLDP parameters:

• To make sure that LLDP neighbors can receive LLDPDUs to update information about the current

device before it ages out, configure the LLDPDU transmit delay to be less than the TTL.

• Set the LLDPDU transmit interval to be no less than four times the LLDPDU transmit delay.

• If the LLDPDU transmit delay is greater than the LLDPDU transmit interval, the device uses the

LLDPDU transmit delay as the transmit interval.

To change LLDP parameters:

Ste

Command

Remarks

1. Enter system view.

system-view N/A

2. Set the TTL multiplier.

lldp hold-multiplier value The default setting is 4.