Implementing High Availability in a Campus Environment Optimizing HSRP参考.ppt

Implementing High Availability in a Campus Environment Optimizing HSRP HSRP Optimization Options These options can be configured to optimize HSRP: HSRP standby priority HSRP standby preempt Hello message timers HSRP interface tracking Configuring HSRP Standby Priority Configuring HSRP Standby Preempt Configuring the Hello Message Timers HSRP Interface Tracking HSRP Interface Tracking (Cont.) Configuring HSRP Tracking Tuning HSRP Configure hellotime and holdtime to millisecond values. Configure preempt delay timer so that preempt occurs only after the distribution switch has fully rebooted and established full connectivity to the rest of the network. Multiple HSRP Groups Addressing HSRP Groups Across Trunk Links To load balance routers and links: Per VLAN, configure the HSRP active router and the spanning tree root to be the same multilayer switch. About the HSRP Debug Command debug standby events debug standby terse Debugging HSRP Summary Preempt, timers, and interface tracking are options that can be configured to optimize HSRP. HSRP preempt can be tuned by adjusting timers that can thereby reduce failover time. To facilitate load sharing, a single interface on a router can be a member of multiple HSRP groups. Specific debug commands are used to view HSRP state changes. Debug can be used to discover the virtual IP address and the priority of the active and standby routers. Cisco Network Academy. All rights reserved.. CCNP+ BSMSN v3.0 Cisco Network Academy. All rights reserved.. CCNP+ BSMSN v3.0 The router with the highest priority in an HSRP group becomes the active router. The default priority is 100. In the case of a tie, the router