Dell Force10 S4810P S4810 Configuration Guide, FTOS 8.3.10.1 - Page 1100

www.dell.com | support.dell.com 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, S4810, S55, and S60, or the FP on the S25/S50. 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 55-1. 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 Between 1000 and 1200 Between 1200 and 1500 Recommended Advertise Interval Groups/Interface E-Series C-Series S-Series (S25, S50) E-Series E-Series ExaScale TeraScale 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 7 seconds 7 seconds 7 seconds 512 255 8 seconds 8 seconds 8 seconds 512 255 S-Series C-Series (S25, S50) 12 12 24 24 36 36 48 48 84 84 100 100 120 120 Table 55-2. Recommended VRRP Advertise Intervals on the S4810, S55, S60 Total VRRP Groups Less than 250 Between 250 and 450 Between 450 and 600 Between 600 and 800 Between 800 and 1000 Between 1000 and 1200 Between 1200 and 1500 Recommended Advertise Interval S4810 S55 S60 1 second 2 - 3 seconds 3 - 4 seconds 4 seconds 5 seconds 7 seconds 8 seconds 1 second 2 - 3 seconds 3 - 4 seconds 4 seconds 5 seconds 7 seconds 8 seconds 1 second 2 - 3 seconds 3 - 4 seconds 4 seconds 5 seconds 7 seconds 8 seconds Groups/Interface S4810 S55 512 100 512 100 512 100 512 100 512 100 512 100 512 100 S60 100 100 100 100 100 100 100 The recommendations in Table 55-1 may vary depending on various factors like ARP broadcasts, IP broadcasts, or STP before changing the advertisement interval. When the number of packets processed by RP2/CP/FP processor increases or decreases based on the dynamics of the network, the advertisement intervals in may increase or decrease accordingly. CAUTION: Increasing the advertisement interval increases the VRRP Master dead interval, resulting in an increased failover time for Master/Backup election. Take extra caution when increasing the advertisement interval, as the increased dead interval may cause packets to be dropped during that switch-over time. 1100 | Virtual Router Redundancy Protocol (VRRP)