Avaya P580 User Manual download pdf (Page 390)

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101

9-104 Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1

Chapter

Non-Address

Owner Features

Non-address owner features are:

■ Requires more configuration but allows for more control and

customization of the Priorities of each virtual router.

■ The virtual router IP Address and associated IP Address will

both be displayed in the ARP Cache Table. This is helpful for

troubleshooting and identification.

■ Preempt Mode can be used. As described in the "IP Address

Owner Features" section, if the Preempt Mode is set to False,

then a higher Priority virtual router will not assume

Mastership from a virtual router that is currently Master. This

is helpful when a router goes down and the Backup router

becomes Master. When the original router comes back

online, it will not take Mastership from the current Master.

This will allow the current traffic to remain unchanged.

Another state change will only occur if the current Master

router goes down. This is especially helpful in a network

where a routing protocol is used (RIP, OSPF). In most cases,

the VRRP election process will take place before the routing

table has been updated. This may cause a longer period of

traffic loss.

Assigning

Priorities to

Virtual Routers

The allowed configurable range for the Priority of a virtual router is

1-254. 255 is reserved for a virtual router that is IP Address Owner

(as described above). If two routers are participating in VRRP,

making the desired Master router 254 (or 255 if IP Address Owner)

and the Backup router 100 (the default Priority) is a common

configuration. If multiple routers will be backing up the Master

router, then the Priorities can be assigned in descending order (100,

99, 98, etc., for example).

Equal Priorities are also allowed but may be more difficult to

troubleshoot. If two Master routers have the same Priority (and the

same VRRP settings), the VRRP election process then checks the

associated IP Address of each virtual router. In that case, the

associated IP Address with a higher value becomes Master.

However, if a Master and Backup virtual router have the same

Priority, the Backup will not become Master even if it has a higher

associated IP Address. In other words, equal priorities are not

enough for a backup router that is already in the Primary state to

become Backup.

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Avaya P580 User Manual Page 390

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