HSRP IP Address

Hey guys, so when choosing which device is going to be the 'Active' and which will be the 'Standby' if the priorities are the same then it will go on the highest IP address?

No 'Highest' IP address. Does this mean a number closer to 0 or higher to 255 if you know what I mean?

For example I have the following:

R3

interface Ethernet0/0
ip address 172.23.23.3 255.255.255.0
half-duplex
standby 5 ip 172.23.23.10
standby 5 preempt

R2

interface Ethernet0/0
ip address 172.23.23.2 255.255.255.0
half-duplex
standby 5 ip 172.23.23.10
standby 5 preempt

So I was think 'Oh R3 will be the active because 3 is higher than 2' But R2 became the active.

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Comments

astorrs

HSRP will only preempt (if enabled) based on priority value not IP address. R2 came up from boot first in your situation (I'm assuming). If you have a third router "R1" and set it with a priority of 90, then once its assumed the primary role shut it down and R3 will take over.

ampdeck

here's a sample config for both distribution switch

DSW1
interface Vlan69
description distribution switch1
ip address 172.23.23.8 255.255.255.240
no ip redirects
no ip unreachables
no ip proxy-arp
ip flow ingress
ip route-cache flow
standby 4 ip 172.23.23.10
standby 4 priority 120
standby 4 preempt

DSW2
interface Vlan69
description distribution switch1
ip address 172.23.23.9 255.255.255.240
no ip redirects
no ip unreachables
no ip proxy-arp
ip flow ingress
ip route-cache flow
standby 4 ip 172.23.23.10
standby 4 priority 140 <

makes this switch active!
standby 4 preempt

alliasneo

Thanks for responses. But say I don't set the priority at all and this stays at 100 for both, the default of choosing which is active and which is the standby is based on the IP Address, correct? So on the IP address alone which would it choose as a higher value .2 or .3?

Thanks

networker050184

The higher IP wins, so .3. That is if they come up at the same time and negotiate. If you configure the .2 side first and it declares itself master the .3 won't take over automatically.