ETIC 1230 Bedienungsanleitung PDF herunterladen (Seite 56)

CONFIGURATION

Page 56 User guide ref. 9015909-03 Industrial router IPL-E

13 VRRP redundancy

That function is available only in IPL-E-1400B, IPL-E-1220B, IPL-E-1230B

routers

13.1 Principle

VRRP is a protocol designed to increase the availability of the default

gateway of a subnet.

Thanks to VRRP, a group of two or more routers can service the hosts of

one subnet instead of only one usually; only one router of that group

actually routes frames; if it fails another one of the group takes its place.

The routers belonging to a VRRP group must be connected to the same

Ethernet segment.

VRRP works as follows :

An usual IP address is assigned to each router of the group.

An additional and common IP address, called the virtual IP address is

assigned to all the routers of the group. This virtual address is the address

which must be stored as the default gateway address in all the host

devices belonging to the subnet.

A priority index is assigned to each router of the group. Using that index,

the routers of the group can elect a master router; the master router is the

one which has the greatest priority code. The other routers are the backup

routers.

The master router is the only one to answer to the ARP requests and route

actually frames. It uses the virtual IP address and the virtual MAC

address If that option has been selected.

In case of failure of the master router, another master router is elected. It

replaces the router in failure. It will use the same virtual IP address and

the virtual MAC address as the previous master router.

The IPL-E router manages that protocol as well on the LAN and on the

WAN interface.

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ETIC 1230 Bedienungsanleitung Seite 56