DES-3326S Layer 3 Fast Ethernet Switch User’s Guide

3 Summary Link (IP

Network)

4 Summary Link (ASBR)

 

 

 

 

 

5

AS External Link

 

Link State ID

 

 

This

field

identifies

the

 

 

 

 

 

portion

of

the

internet

 

 

 

 

 

environment that is being

 

 

 

 

 

described

 

by

the

 

 

 

 

 

advertisement.

 

The

 

 

 

 

 

contents

of

this

field

 

 

 

 

 

depend

 

 

on

 

the

 

 

 

 

 

advertisement’s

 

Link

 

 

 

 

 

State Type.

 

 

 

 

 

 

Advertising Router

 

The

Router

ID

of

the

 

 

 

 

 

router that originated the

 

 

 

 

 

Link State Advertisement.

 

 

 

 

 

For

example,

in

network

 

 

 

 

 

links advertisements

this

 

 

 

 

 

field is set to the Router

 

 

 

 

 

ID

of

the

network’s

 

 

 

 

 

Designated Router.

 

 

 

Link

State

Sequence

Detects

old

or

duplicate

 

Number

 

 

 

link state advertisements.

 

 

 

 

 

Successive instances of a

 

 

 

 

 

link

state

advertisement

 

 

 

 

 

are given successive Link

 

 

 

 

 

State Sequence numbers.

 

Link State Checksum

 

The Fletcher checksum of

 

 

 

 

 

the

complete

contents of

 

 

 

 

 

the

 

link

 

state

 

 

 

 

 

advertisement, including

 

 

 

 

 

 

 

 

 

 

 

 

 

154

 

 

Switch Management and Operating Concepts

Page 154
Image 154
D-Link DES-3326S manual 154