Avaya Configuring Interface and Router Redundancy Manuel d'utilisateur télécharger pdf (Page 79)

Router Redundancy Examples

308626-14.00 Rev 00

B-7

Example 4: Router Redundancy with Ethernet Switches

Figure B-4 illustrates a router redundancy group with primary and secondary

routers connected to BayStack

™

Ethernet switches, in this example a BayStack

281xx Fast Ethernet switch. This configuration allows you to use router

redundancy with a bridged or frame-switched network.

Figure B-4. Router Redundancy with 281

Fast Ethernet Switches

The routers have the same MAC address, and their redundancy configurations are

identical in all other ways. Using connected hubs allows each switch to use only

one port to connect to both routers. Because the switches use the spanning tree

algorithm, only one of the switch ports is in use at any time. Neither switch can

detect that its partner switch is also connected to the same router redundancy

group. Neither switch can detect that there are two different routers using the same

MAC address on different ports. The switches therefore accept or send data

regardless of which router is acting in the primary role.

You can configure router redundancy with only one hub and one port of one 281xx

switch, but a single point of failure then exists.

RRE0005A

281

switch 281

switch

Hub A

Hub B

Router A

Router B

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Avaya Configuring Interface and Router Redundancy Manuel d'utilisateur Page 79