SNR S2989G-8TX — настройка Keepalive Gateway для Ethernet-портов [197/553]

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S2989G-24TX Operation Manual

Chapter 3 IP services Configuration

3-35

the illegal ARP.

3.13

Keepalive Gateway

3.13.1

Introduction to Keepalive Gateway

Ethernet port is used to process backup or load balance, for the reason that it is a

broadcast channel, it may not detect the change of physical signal and fails to get to down

when the gateway is down. Keepalive Gateway is introduced to detect the connectivity to

the higher-up gateway, in the case that a Ethernet port connect with a higher-up gateway

to form a point-to-point network topology.

For example: router connects optical terminal device and the line is up all the time,

While the line between moden and remote gateway is down, it is necessary to use a

effective method to detect whether the remote gateway is reachable. At present, detect

gateway connectivity by sending ARP request to gateway on time, if ARP resolution is

failing, shutdown the interface, if ARP resolution is successful, keep the interface up.

Only layer 3 switch supports keepalive gateway function.

3.13.2

Keepalive Gateway Configuration Task List

1. Enable or disable keepalive gateway, configure the interval period that ARP request

packet is sent and the retry-count after detection is failing

2. Show keepalive gateway and IPv4 running status of the interface

1. Enable or disable keepalive gateway, configure the interval period that ARP request

packet is sent and the retry-count after detection is failing

Command

Explanation

Interface mode

keepalive gateway <ip-address>

[{<interval-seconds> | msec

<interval-millisecond >} [retry-count]]

no keepalive gateway

Enable keepalive gateway, configure IP

address of gateway, the interval period that

ARP request packet is sent, and the retry-

count after detection is failing, the no

command disables the function.