FTOS Configuration Guide for the C-Series - Force10 Networks

VRRP Benefits
With VRRP configured on a network, end-station connectivity to the network is not subject to a single
connection. End-station connections to the network are redundant and they are not dependent on IGP
protocols to converge or update routing tables.
VRRP Implementation
Note: 1500 VRRP groups are not supported in FTOS Release 6.2.1.0 and lower.
E-Series supports an unlimited number of VRRP groups, and up to 255 VRRP groups on a single interface.
C-Series supports 128 VRRP groups; the number of groups per interface varies, as shown in Table 46.
Within a single VRRP group, up to 12 virtual IP addresses are supported. Virtual IP addresses can belong
to either the primary or secondary IP address’ subnet configured on the interface. You can ping all the
virtual IP addresses configured on the Master VRRP router from anywhere in the local subnet.
Though FTOS supports unlimited VRRP groups, certain inherent factors affect the maximum number of
groups that can be configured and expected to work properly, the main factor being the throttling of VRRP
advertisement packets reaching the RP2 processor on the E-Series (or the CP on the C-Series). To avoid
throttling of VRRP advertisement packets, Force10 recommends you to increase the VRRP advertisement
interval to a higher value from the default value of 1 second. The recommendations are as follows:
Table 46 Recommended VRRP Advertise Intervals
Total VRRP Groups
Recommended Advertise Interval Groups/Interface
E-Series C-Series E-Series C-Series
Less than 250 1 second 1 second 255 12
Between 250 and 450 2 second 2 - 3 second 255 24
Between 450 and 600 3 second 4 second 255 36
Between 600 and 800 4 second 5 second 255 48
Between 800 and 1000 5 second
Between 1000 and 1200 6 second
Between 1200 and 1500 7 second
Beyond 1500 8 or more seconds
FTOS Configuration Guide, version 7.7.1.0 431