This is my note when my learning HSRP :
DSW1#sh run int vlan 10 Building configuration... Current configuration : 189 bytes ! interface Vlan10 ip address 10.2.1.1 255.255.255.0 standby 10 ip 10.2.1.254 standby 10 priority 200 standby 10 preempt standby 10 name VLAN10 standby 10 track 10 decrement 110 end DSW1#sh run | s track track 10 ip route 10.1.21.128 255.255.255.255 metric threshold threshold metric up 61 down 62 standby 10 track 10 decrement 110 DSW1#sh track Track 10 IP route 10.1.21.128 255.255.255.255 metric threshold Metric threshold is Down (EIGRP/158720/62) 7 changes, last change 00:08:51 Metric threshold down 62 up 61 First-hop interface is Vlan10 Tracked by: HSRP Vlan10 10
Why its 61 ?
158720 devide by 2560 so we got 61.
HSRP Failover standby are monitored its route table.
If the threshold less greather than 61 then HSRP assume its route fail so router needs to failover its standby.
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