Summary

Device, link or hardware component redundancy at strategic points in the network leads to High Availability. HSRP provides router redundancy to network hosts and can be optimized in several ways. VRRP and GLBP were derived from HSRP providing additional redundancy features. Cisco uses redundant Supervisor Engines as well as software features to optimize network resiliency upon component failure. SRM is a Cisco High Availability solution facilitating failover to a second MSFC. Highly available networks are those configured to provide infrastructure paths and access to key devices at all times.