CONEL SPECTRE v3 ERT — настройка VRRP для резервирования маршрутизации [35/136]

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4. CONFIGURATION

4.2 VRRP Conﬁguration

Select the VRRP menu item to enter the VRRP conﬁguration. VRRP protocol (Virtual

Router Redundancy Protocol) allows you to transfer packet routing from the main router to

a backup router in case the main router fails. (This can be used to provide a wireless cellular

backup to a primary wired router in critical applications.) If the Enable VRRP is checked, you

may set the following parameters.

Item Description

Virtual Server IP Address This parameter sets the virtual server IP address. This ad-

dress must be the same for both the primary and backup

routers. Devices on the LAN will use this address as their

default gateway IP address.

Virtual Server ID This parameter distinguishes one virtual router on the net-

work from another. The main and backup routers must use

the same value for this parameter.

Host Priority The active router with highest pr iority set by the parameter

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

main router should have the highest possible priority – 255.

The backup router(s) have a priority in the range 1 – 254

(default value is 100). A priority value of 0 is not allowed.

Table 18: VRRP conﬁguration

You may set the Check connection ﬂag in the second part of the window to enable au-

tomatic test messages for the cellular network. In some cases, the mobile WAN connection

could still be active but the router will not be able to send data over the cellular network. This

feature is used to verify that data can be sent over the PPP connection and supplements

the normal VRRP message handling. The currently active router (main/backup) will send test

messages to the deﬁned Ping IP Address at periodic time intervals (Ping Interval) and wait for

a reply (Ping Timeout). If the router does not receive a response to the Ping command, it will

retry up to the number of times speciﬁed by the Ping Probes parameter. Af ter that time, it will

switch itself to a backup router until the PPP connection is restored.

Item Description

Ping IP Address Destinations IP address for the Ping commands. IP Address can

not be speciﬁed as a domain name.

Ping Interval Interval in seconds between the outgoing Pings.

Ping Timeout Time in seconds to wait for a response to the Ping.

Ping Probes Maximum number of failed ping requests.

Table 19: Check connection

You may use the DNS server of the mobile carr ier as the destination IP address for the test

messages (Pings).