HSRP

=__Hot Standby Router Protocol__= Virtual IP & MAC MAC - 0000.0C07.ACxx (xx is hex for HSRP group) 3 second hello interval 10 second dead interval =Basic Configuration=

config-if# standby 10 ip 172.16.1.1 config-if# standby priority 0...255 (100 is default)

=Preempt=

config-if# standby 10 preempt (reclaim position if you have higher priority then the current primary router)

=Interface Tracking=

config-if# standby 10 track s0/0 60 (lower priority by 60 if s0/0 goes down) config# track 23 interface serial0/0.1 line-protocol config-if# standby 1 track 23 decrement 60

=Authentication=

config-if# standby 10 authentication WORD

=Timers=

config-if# standby 10 timers 1 4 (help and dead; dead = help x 3 + 1)

**VVRP**

000.5E00.01xx IOS tracking feature, instead of own preemption by default Master = Active

=GLBP=

load-balancing features gateway-redundancy features 0007.B400.xxyy (xx GLBP group number; yy is router number) GLBP replies to ARPs with different MAC addresses for the different router 1024 GLBP groups per physical interface and 4 routers per group

**View/Debug Commands** show standby debug standby