CONEL ER75i v2 — настройка VRRP через веб-браузер: пошаговое руководство [29/106]

Превью страниц Страница 29 / 106

1. CONFIGURATION OVER WEB BROWSER

1.12 VRRP conﬁguration

To enter the VRRP conﬁguration select the VRRP menu item. VRRP protocol (Virtual

Router Redundancy Protocol) is a technique, by which it is possible to forward routing from

main router to backup router in the case of the main router failure. If the Enable VRRP is

checked, then it is possible to set the following parameters.

Item Description

Virtual Server IP Address This parameter sets virtual server IP address. This address

should be the same for both routers. A connected device

sends its data via this virtual address.

Virtual Server ID Parameter Virtual Server ID distinguishes one virtual router

on the network from others. Main and backup routers must

use the same value for this parameter.

Host Prior ity The router, with higher priority set by the parameter Host

Priority, is the main router. According to RFC 2338 the main

router has the highest possible priority - 255. The backup

router has priority in range 1 – 254 (init value is 100). The

priority value equals 0 is not allowed.

Table 17: VRRP conﬁguration

It is possible to set Check connection ﬂag in the second par t of the window. The currently

active router (main/backup) will send testing messages to deﬁned Ping IP Address at periodic

time intervals (Ping Interval) with setting time of waiting for answer (Ping Timeout). The func-

tion check connection is used as a supplement of VRRP standard with the same ﬁnal result.

If there are no answers from remote devices (Ping IP Address) for a deﬁned number of probes

(Ping Probes), then connection is switched to the other line.

Item Description

Ping IP Address Destinations IP address ping queries. Address can not specify as

domain name.

Ping Interval Time intervals between the outgoing pings.

Ping Timeout Time to wait to answer.

Ping Probes Number of failed ping requests, after which the route is considered

to be impassable.

Table 18: Check connection

Ping IP address is possible to use for example a DNS server of mobile operator as a test

message (ping) IP address.

There’s an additional way for evaluating the state of the active line. It is activated by select-

ing Enable trafﬁc monitoring parameter. If this parameter is set and any packet different from

ping is sent to the monitored line, then any answer to this packet is expected for Ping Timeout.