Vrrp Benefits; Vrrp Implementation - Dell Force10 C150 Configuration Manual

VRRP Benefits

With VRRP configured on a network, end-station connectivity to the network is not subject to a single
point-of-failure. End-station connections to the network are redundant and they are not dependent on IGP
protocols to converge or update routing tables.

VRRP Implementation

On E-Series ExaScale and TeraScale routers, VRRP is implemented as follows:
• When VRF microcode is not loaded, VRRP supports an unlimited total number of VRRP groups on a
router and up to 255 VRRP groups on an interface (see
• When VRF microcode is loaded (see
unlimited total number of VRRP groups on a router and up to 15 VRRP groups on an interface (see
Table 58-1).
C-Series supports a total of 128 VRRP groups on the switch with varying number of maximum VRRP
groups per interface
S-Series supports a total of 120 VRRP groups on a switch with FTOS or a total of 20 VRRP groups when
using SFTOS. The S-Series supports varying number of maximum VRRP groups per interface
(Table 58-1).
Within a single VRRP group, up to 12 virtual IP addresses are supported. Virtual IP addresses can belong
to 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 on E-Series supports unlimited VRRP groups, default VRRP settings may affect the
maximum number of groups that can be configured and work efficiently, as a result of hardware throttling
VRRP advertisement packets reaching the RP2 processor on the E-Series, the CP on the C-Series, or the
FP on the S-Series. To avoid throttling VRRP advertisement packets, Dell Force10 recommends you to
increase the VRRP advertisement interval to a value higher than the default value of 1 second. The
recommendations are as follows:
Table 58-1. Recommended VRRP Advertise Intervals
Total VRRP Groups
Less than 250
Between 250 and 450
Between 450 and 600
Between 600 and 800
Between 800 and 1000
Load the VRF CAM Profile on page
(Table 58-1).
Recommended Advertise Interval
E-Series C-Series
1 second 1 second
2 seconds 2 - 3 seconds
3 seconds 4 seconds
4 seconds 5 seconds
5 seconds 5 seconds
Table 58-1).
E-Series
S-Series ExaScale
1 second 512
2 - 3 seconds 512
3 - 4 seconds 512
4 seconds 512
5 seconds 512
Virtual Router Redundancy Protocol (VRRP) | 1129
1115), VRRP supports an
Groups/Interface
E-Series
TeraScale C-Series S-Series
255 12
255 24
255 36
255 48
255 84
12
24
36
48
84