Westermo RedFox Series - Manual (Page 668)

Westermo OS Management Guide
Version 4.17.0-0
30.1.6 VRRP Control of static IP Multicast Routing
When using static multicast routing and VRRP a problem that can occur is that
the multicast packets will get duplicated. This can be avoided by using the VRRP
multicast routing control. When using this feature, only the master router will
forward incoming multicast traffic from the configured VRRP interface while the
backup router will prevent the packets from being forwarded.
Note
The setting is applied per interface. It is not recommended to configure more
than one instance per interface as this will lead to unpredictable results.
30.1.7 Load sharing
It is possible to use VRRP for load sharing between routers, and still provide
redundancy, by having the routers acting as backup for each other.
Fig. 30.3
shows a load sharing example. Here the VIP addresses reside within the same IP
subnet. However, since WeOS supports multi-netting, the VIP addresses could be
on different IP subnets.
.1 .2
192.168.1.4
Priority 75
(Backup)
Virtual IP:
VRID 44:
192.168.1.4
Priority 200
(Master)
Virtual IP:
VRID 44:
192.168.1.3
Priority 100
(Backup)
Virtual IP:
VRID 33:
192.168.1.3
Priority 150
(Master)
Virtual IP:
VRID 33:
H
.22
H
.25
H
.14
H
.77
H
.67
H
.90
(R2 Master, R1 Backup)
Default GW: 192.168.1.3 Default GW: 192.168.1.4
(R1 Master, R2 Backup)
192.168.1.0/24
R1
Internet
(or Corporate Intranet)
R2
Figure 30.3: Example setup where R1 and R2 share the load from IP subnet
192.168.1.0/24, and using VRRP to backup each other.
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