Hivrrp - Hirschmann MACH 4000 User Manual

VRRP/HiVRRP

5.1 HiVRRP

In compliance with RFC 2338, the master sends IP Multicast messages at in-
tervals of one second to the other VRRP routers. Only if this message does
not appear three times do the remaining routers select a new master. VRRP
has typical switching times of 3 to 4 seconds.
Router A
Router B Backup Router
Master Router
Router C
Figure 15: Master router <-> backup router switching times according to RFC 2338
VRRP priority router A = 64
VRRP priority router B = 128
VRRP priority router C = 254
To be able to achieve faster switching times, Hirschmann provides HiVRRP
so that the cycle for sending the IP Multicast message can be shortened to
as little as 0.1 seconds. You can thus achieve switching times that are up to
ten times as fast.
The router supports up to 16 VRRP router interfaces with this shortened
sending cycle.
Routing L3P
Release 4.0 11/07
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Interval
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0 1 2
Skew-Time
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3 4 5
5.1 HiVRRP
Backup Router
Master Router
6 t [s]
47