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CCNP SWITCH(642-813) HotSpot – Super HSRP

Ferris Plastics,Inc. is a medium sized company, with enterprise network(access,distribution and core) switches that provide LAN connectivity from user PCs to corporate servers.The distribution switches are configured to use HSRP to provide a high availability solution as follows:

-DSW1(Distribution Switch 1)is the primary device for VLAN 101,VLAN 102 and VLAN 105.

-DSW2(Distribution Switch 2)is the primary device for VLAN 103 and VLAN 104.

-A failure of GigabitEthernet1/0/1 on the primary device should block the primary device from being the active device,unless GigabitEthernet1/0/1 on the backup device has also failed.

Questions and Answers:

Answer: On DS2, increase the priority value to a value greater 241 and less than 249

Answer: Enable preempt on DS1’s Vlan101 HSRP group


A is correct. All other answers is incorrect. Because Vlan101 on DS1 ( left ) disable preempt. We need enable preempt to after it reactive, it will be active device. If not this command, it never become active device.

Answer: The DS1’s decrement value should be configured with a value from 11 to 18


Use "show run" command to show. The left Vlan102 is console1 of DS1. Priority value is 200, we should decrement value in the track command from 11 to 18. Because 200 ­ 11 = 189 < 190( priority of Vlan102 on DS2 ).

Answer: 100


Use "show standby brief" command on console2 . Very easy to see priority of Vlan105 is 100.

Answer: 95


Priority is configured 150, Track is 55. So, if shutdown interface G1/0/1 ­> 150 ­ 55 = 95.

Answer: On DS1, increase the decrement value in the track command to a value greater than 6


We should NOT disable preempt on DS1. By do that, you will make Vlan104’s HSRP group fail function.

Example: if we are disable preempt on DS1. It can not become active device when G1/0/1 on DS2 fail. In this question, G0/1/0 on DS1 & DS2 is shutdown. Vlan104 (left) : 150 ­ 1 = 149. Vlan104 (right) : 200 ­ 155 = 145. Result is priority 149 > 145 ( Vlan104 on DS1 is active). If increase the decrement in the track value to a value greater than 6 ( > or = 6). Vlan104 (left) : 150 ­ 6 = 144. Result is priority 144 < 145 ( vlan104 on DS2 is active).

One thought on “CCNP SWITCH(642-813) HotSpot – Super HSRP

  1. manaya says:

    😮 very good explanation.

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