To pass the BCMSN exam and earn your CCNP certification, you've got to know HSRP inside and out. While the operation and basic commands of HSRP are pretty simple, there are some important details that are easily overlooked but are vital in getting HSRP to work the way you want it to. Let's take a look at using the priority command correctly on both the exam and in production networks.
Laptop Battery A key value in the show standby command is the priority. The default is 100, and the router with the highest priority will be the primary HSRP router. We'll raise the default priority on R2 and see the results. R3 is currently the Active router and R2 the standby, so let's raise the priority on R2 and see what happens.
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Thinkpad R2(config)#interface ethernet0
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Microsoft R2(config-if)#standby 5 priority 150
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Laptop Computers
R2#show standby
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Laptop Computer Ethernet0 - Group 5
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Desktop Computer Local state is Standby, priority 150
Notebooks Hellotime 4 sec, holdtime 12 sec
Lenovo Next hello sent in 0.896
Hard Drive Virtual IP address is 172.12.23.10 configured
Travelstar Active router is 172.12.23.3, priority 100 expires in 8.072
Gateway Standby router is local
Laptop Parts 1 state changes, last state change 00:14:24
Software R2 now has a higher priority, but R3 is still the active router. R2 will not take over as the HSRP primary until R3 goes down - OR the preempt option is configured on R2.
Hard Drives R2(config-if)#standby 5 priority 150 preempt
Electronics
1d11h: %STANDBY-6-STATECHANGE: Ethernet0 Group 5 state Standby -> Active
Canon
R2#show standby
Desktop Pc Ethernet0 - Group 5
Desktop Computers Local state is Active, priority 150, may preempt
Think Pad Hellotime 4 sec, holdtime 12 sec
Repair Next hello sent in 1.844
Data Recovery Virtual IP address is 172.12.23.10 configured
Cisco Active router is local
Keyboard Standby router is 172.12.23.3 expires in 10.204
Monitor Virtual mac address is 0000.0c07.ac05
Desktop 2 state changes, last state change 00:00:13
Infosys In just a few seconds, a message appears that the local state has changed from standby to active. Show standby confirms that R2, the local router, is now the active router - the primary. R3 is now the standby. So if anyone tells you that you have to take a router down to change the Active router, they're wrong - you just have to use the preempt option on the standby priority command.
Refurbished Laptops Another vital part of HSRP configurations is knowing how to change the MAC address of the virtual router, as well as interface tracking. We'll look at those features in the next part of my HSRP tutorial!
Wipro
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