Dell Force10 S25-01-GE-24V FTOS 8.4.2.7 Configuration Guide for E-Series TeraS - Page 1129

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 Table 58-1). • When VRF microcode is loaded (see Load the VRF CAM Profile on page 1115), VRRP supports an 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 (Table 58-1). 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 Recommended Advertise Interval Groups/Interface E-Series C-Series S-Series E-Series E-Series ExaScale TeraScale C-Series S-Series 1 second 1 second 1 second 512 255 2 seconds 2 - 3 seconds 2 - 3 seconds 512 255 3 seconds 4 seconds 3 - 4 seconds 512 255 4 seconds 5 seconds 4 seconds 512 255 5 seconds 5 seconds 5 seconds 512 255 12 12 24 24 36 36 48 48 84 84 Virtual Router Redundancy Protocol (VRRP) | 1129