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Cisco Routers: HSRP Group Status

Distribution: official part of Check_MK
License: GPLv3
Supported Agents: SNMP

Cisco routers support virtual redundant interfaces by using HSRP (Hot Standby Router Protocol). HSRP is configured by assigning IP interfaces to a group that has a "floating" virtual IP. If, for example, a router has an interface failure on either of the routed interfaces, the protocol lowers the routers priority, and if that priority drops too low, it will fail over the virtual IP.

The check returns OK if the HSRP status is a good one ("active", "standby") and the same as during inventory. If the states flip from "active" to "standby" or vice-versa, the check goes to WARN, assuming that HSRP is doing it's job.

Should the status ever be a different one that for example points to HSRP still initializing, the check will return CRIT as HSRP is assumed to be inoperable in these states.

Item

The Virtual IP of the failover group.

Discovery

The check reads the HSRP MIB and creates one service per virtual IP. If the HSRP state of the group is either active or standby, a service will be created. It also stores this HSRP state of the IP as seen by the monitored device. It also stores the ID of the failover group. (For future use)