Siemens S223 - Manual (Page 227)

User Manual UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5
A50010-Y3-C150-2-7619 227
8.4 Virtual Router Redundancy Protocol (VRRP)
Virtual router redundancy protocol (VRRP) is configuring Virtual router (VRRP Group)
consisted of VRRP routers to prevent network failure caused by one dedicated router.
You can configure maximum 255 VRRP routers in VRRP group of hiD 6615 S323. First of
all, decide which router plays a roll as Master Virtual Router. The other routers will be
Backup Virtual Routers. After you give priority to these backup routers, the router serves
for Master Virtual Router when there are some problems in Master Virtual router. When
you configure VRRP, configure all routers in VRRP with unified Group Id and assign uni-
fied Associated IP to them. After that, decide Master Virtual Router and Backup Virtual
Router. A router which has the highest priority is supposed to be Master and Backup Vir-
tual Routers also get orders depending on priority.
Routing functionalities such as RIP, OSPF, BGP, VRRP and PIM-SM are only available for
hiD 6615 S323. (Unavailable for hiD 6615 S223)
Internet
Backup Router 1
IP : 10.0.0.1/24
Default Gateway : 10.0.0.5/24
Backup Router 2
IP : 10.0.0.2/24
Backup Router 3
IP : 10.0.0.3/24
Virtual Router
Associate IP : 10.0.0.5/24
Fig. 8.28 VRRP Operation
In case routers have same priorities, then a router, which has lower IP address, gets the
precedence. Fig. 8.28 shows an example of configuring three routers which have IP ad-
dresses, 10.0.0.1/24, 10.0.0.2/24 and 10.0.0.3/24 for each one as Virtual router by Asso-
ciated IP, 10.0.0.5/24. If these three routers have same Priority, a router, which has the
smallest IP, address, 10.0.0.1/24 is decided to be Master Router. Also, switches and PCs
connected to the Virtual Router are to have IP address of Virtual Router, 10.0.0.5/24 as
default gateway.
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