User manual
VOLKTEK NSH-580 MANAGED 24-PORT 10/100 + 4 G COMBO L3 SWITCH
7.6.5 VRRP
The Virtual Router Redundancy Protocol (VRRP) is designed to eliminate the weak point
inherent in the static default routed environment. VRRP specifies an election protocol
that dynamically assigns responsibility for a virtual router to one of the VRRP routers on
a LAN. The VRRP router controlling the IP address(es) associated with a virtual router is
called the Master, and forwards packets sent to these IP addresses. The election
process provides dynamic fail-over in the forwarding responsibility, should the Master
become unavailable. Any of the virtual router’s IP addresses on a LAN can then be used
as the default first hop router by end-hosts. The advantage gained from using VRRP is a
higher availability default path without requiring configuration of dynamic routing or
router discovery protocols on every end host.
Virtual ID: Virtual router ID, range 1 to 255. One virtual router ID can be used as the
default gateway for one or several VLANs.
Virtual IP: Virtual IP address. It can be any one IP address which belongs to the
VLAN to be managed. In general, it can be the same as the interface IP address and
you expect it to act as master router.
Priority: Virtual router priority. Range 1 to 254, default 100. Higher value means
higher priority. Priority value to be used by this VRRP router in selecting the Master
for this virtual router. The value of 255 (decimal) is reserved for the router that owns
the IP addresses associated with the virtual router. The value of 0 (zero) is reserved
for Master router to indicate it is releasing responsibility for the virtual router. The
range 1-254 (decimal) is available for VRRP routers backing up the virtual router.
Advertisement Interval: Time interval between ADVERTISEMENTS (seconds).
Default is 1 second.
Preempt Mode: Controls whether a higher priority Backup Router preempts a lower
priority Master. Values are True to allow preemption and False to not prohibit
preemption. Default is True.
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