Westermo RedFox Series - Manual (Page 666)

Westermo OS Management Guide
Version 4.17.0-0
When preemption is enabled, an optional preemption delay parameter can
be configured (default 0 seconds), which determines how long the router
should wait until preemption is activated. Default: Disabled
Note
When the instance belongs to a synchronized group, the instance with
the shortest preemption delay will be used.
Note
Preemption only occurs when starting or restarting a higher priority
backup router, e.g. if a link down event occurs preemption will not be
used.
A sample VRRP configuration for R1 in fig. 30.1 b is shown below:
Example
router vrrp 1
iface vlan2
address 192.168.1.3
vrid 33
priority 150
end
30.1.3 Selecting VRRP version (VRRPv2 or VRRPv3)
WeOS supports VRRP version 2 and version 3.The additions to version 3 is shorter
advertisement interval (faster failover) and IPv6 support (not supported in WeOS).
Authentication has been removed completely in version 3 since it was considered
to not provide any real security. It is mandatory that the master and the backup
routers uses the same VRRP version. Default: VRRPv2
30.1.4 Authentication (VRRPv2 only)
Warning
Use of VRRP authentication is discouraged[ 11 ], as it may cause more harm
than help.
For VRRPv2, WeOS supports a simple form of VRRP message authentication, en-
abling the inclusion of a plain-text password in the VRRP advertisements[
19 ].
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