Avaya Configuring Interface and Router Redundancy Instrukcja Użytkownika Strona 81

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Router Redundancy Examples
114079 Rev. B 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
xx
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
XX
switch 281
XX
switch
Hub A
Hub B
Router A
Router B
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