HSRP SNMP Support
Problem
You
want to enable HSRP SNMP traps.
Solution
Cisco has developed an HSRP SNMP MIB to help manage routers
using this feature. You can configure your router to send an SNMP trap every
time the routers make an HSRP state change:
Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#snmp-server enable traps hsrp
Router1(config)#snmp-server host 172.25.1.1 ORATRAP
Router1(config)#end
Router1#
Discussion
Usually when a router changes its HSRP state, this indicates
that some sort of network problem has occurred. If you are tracking interfaces
as in Recipe
22.3, then the problem may be that the WAN interface on the primary router
has failed. In this case, you will almost certainly also receive a Link-Down
trap from the primary router, as well as a trap indicating that the primary has
become inactive and the secondary router has become active.
In some cases, it can be extremely useful to receive these
traps. For example, the primary router's power supplies may have suddenly
failed. In this case, the first indication you may get that there has been a
problem will be the next time your network management system tries to poll the
primary router. Clearly, there are cases when you want to know about the change
sooner than that. So having the secondary router to send a trap to indicate the
change of HSRP state may be the fastest way to get this information.
These traps can also be useful if there is something wrong with
your HSRP setup, so that the two routers are continually flipping back and forth
between active and standby states. As long as the traffic continues to flow, you
may not otherwise know that there is a problem. This could happen, for example,
if you set the HSRP timers improperly.
Cisco's HSRP MIB also allows you to use SNMP to query the
routers for their current HSRP state information. Please refer to Chapter 17
for more information about using SNMP.
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