Avaya Configuring Interface and Router Redundancy Uživatelský manuál stáhnout pdf (Strana 37)

Implementation Notes

114079 Rev. A 3-3

Using Interface and Router Redundancy in Combination

Use interface redundancy with router redundancy to provide combined protection

from internal router failure and total router failure. The combination of interface

and router redundancy provides better interface protection than is possible using

interface redundancy alone.

You can conﬁgure backed-up interfaces within redundant routers, and you can

also conﬁgure some interfaces that are not backed up. Interface redundancy allows

data transmission to occur without interruption in the event of a failed interface.

Router redundancy provides the security of uninterrupted network service.

Table 3-1 demonstrates what happens when you conﬁgure interface redundancy

across slots when you are using router and interface redundancy together.

Caution: If you conﬁgure interface redundancy across slots with router

redundancy, and the CPU board for the slot with the active interface fails,

router redundancy may take precedence over interface redundancy, even

though there is a member of the interface redundancy group available to

transmit data. The result will be unnecessary delays in data transmission.

Table 3-1. Using Interface Redundancy across Slots with Router Redundancy

Router A Router B

Router A is in the primary role for router

redundancy. It also has the active interface in

the interface redundancy group.

Router B is in the secondary role.

The CPU board for the active interface fails.

Router A detects that it is no longer the best

primary router, so Router A changes its role to

secondary.

Router B is the new best primary router, and it

assumes the primary role. To do so, it reboots,

using the primary conﬁguration ﬁle.

Meanwhile, a redundant interface from the

interface redundancy group has become active,

with the result that Router A is again the best

primary router in the router redundancy group.

Router B recognizes that it is no longer the best

primary router and switches out of the primary

role.

Router A assumes the primary role. To do so, it

reboots, using the primary conﬁguration ﬁle.

Router B is in the secondary role.

Data is again moving, but with delays for rebooting.

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 79 80

Žádné komentáře

Avaya Configuring Interface and Router Redundancy Uživatelský manuál Strana 37