Cisco CCNP BCMSN Exam Tutorial Changing The Active Router In HSRP
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Cisco CCNP BCMSN Exam Tutorial: Changing the Active Router in HSRP
Summary
The priority command in HSRP might seem straightforward, but it holds a critical trick that can impact your exam success. Learn how to handle it correctly and ace the CCNP with Chris Bryant, CCIE12933.
Deep Dive Into HSRP Priority
To pass the BCMSN exam and earn your CCNP certification, mastering HSRP is essential. While its basic operation is simple, crucial details can be easily overlooked but are vital for ensuring HSRP performs as desired. Let's explore the correct use of the priority command in both exams and real-world networks.
Understanding the Show Standby Command
The show standby command reveals key values, including the priority. By default, this is set to 100. The router with the highest priority becomes the primary HSRP router. We'll demonstrate how increasing the default priority on R2 changes the network's behavior. Currently, R3 is active and R2 is standby. Let's raise R2's priority and observe the outcome.
```plaintext
R2(config)
interface ethernet0
R2(config-if)standby 5 priority 150
```Upon checking the standby status:
```plaintext
R2
show standby
Ethernet0 - Group 5Local state is Standby, priority 150
Hellotime 4 sec, holdtime 12 sec
Next hello sent in 0.896
Virtual IP address is 172.12.23.10 configured
Active router is 172.12.23.3, priority 100 expires in 8.072
Standby router is local
1 state changes, last state change 00:14:24
```
Even with a higher priority, R2 remains standby since R3 is still active. R2 will only take over if R3 goes down?"or if the preempt option is configured on R2.
```plaintext
R2(config-if)
standby 5 priority 150 preempt
```A quick message confirms the state change from standby to active:
```plaintext
1d11h: %STANDBY-6-STATECHANGE: Ethernet0 Group 5 state Standby -> Active
```
Rechecking:
```plaintext
R2
show standby
Ethernet0 - Group 5Local state is Active, priority 150, may preempt
Hellotime 4 sec, holdtime 12 sec
Next hello sent in 1.844
Virtual IP address is 172.12.23.10 configured
Active router is local
Standby router is 172.12.23.3 expires in 10.204
Virtual mac address is 0000.0c07.ac05
2 state changes, last state change 00:00:13
```
R2 now asserts itself as the active router, while R3 becomes standby. If you've heard that a router must be taken down to change the active router, it's incorrect?"simply use the preempt option on the standby priority command.
In the next section of my HSRP tutorial, we'll explore changing the virtual router's MAC address and delve into interface tracking. Stay tuned!
You can find the original non-AI version of this article here: Cisco CCNP BCMSN Exam Tutorial Changing The Active Router In HSRP.
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