Ross Vandegrift wrote:
Hi everyone,
Is there any good way to have IOS abdicate the active status on all of
its HSRP interfaces? Of course I could change each of a few thousand
SVIs, but I'd like a better way.
The only thing I can come up with is to create an unnumbered loopback
just to use as a tracking target. Admin down that interface when you
want to take down one of the routers for maintenance.
What platform/IOS? Under later IOS e.g. SXH/SXI on 6500 you can track
the tracking "objects". We do this:
track 10 interface Vlan4000 ip routing
track 11 interface Vlan4001 ip routing
track 100 stub-object
default-state up
track 101 list boolean or
object 10
object 11
int VlanXX
standby 0 track 100 decrement 4
standby 0 track 101 decrement 4
standby 0 preempt delay reload 180
...and then do:
conf t
track 100
default-state down
...or use an EEM script to put the tracking object "down". Obviously the
EEM script opens up a load more possibilities.
Note you can also do this:
int VlanXX
standby 0 track 100 shutdown
...which will shutdown the HSRP group, but you'll then have to wait for
the timers to expire - I prefer the priority decrement with appropriate
pre-empt statements on the standby/master.
Some versions of IOS have HSRP "follow groups":
http://www.cisco.com/en/US/docs/ios/ipapp/configuration/guide/ipapp_hsrp.html#wp1055821
...but on the switch platforms e.g. 6500 this seems to work with
sub-ints only, not SVIs. Sigh.
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