CCNP TSHOOT - Ticket 10

The problem state that DSW1 and DSW2 are configured as HSRP routes and DSW1 should be active router but instead, currently DSW2 is active.

Let's check DSW1's HSRP configuration. 

DSW1#sh standby

Vlan10 - Group 10

  State is Standby

    4 state changes, last state change 00:02:07

  Virtual IP address is 10.2.1.254

  Active virtual MAC address is 0000.0c07.ac0a

    Local virtual MAC address is 0000.0c07.ac0a (v1 default)

  Hello time 3 sec, hold time 10 sec

    Next hello sent in 1.772 secs

  Preemption enabled

  Active router is 10.2.1.2, priority 100 (expires in 7.736 sec)

  Standby router is local

  Priority 90 (configured 150)

    Track object 1 state Down decrement 60

  IP redundancy name is "hsrp-Vl10-10" (default)

Yes, DSW1 is currently standby and not active router. Active router is 10.2.1.2 which is DSW2.

Let's check more detail of DSW1's HSRP configuration in VLAN 10.

DSW1#sh run int vlan 10

Building configuration...

Current configuration : 191 bytes

!

interface Vlan10

 ip address 10.2.1.1 255.255.255.0

 ip helper-address 10.1.4.5

 standby 10 ip 10.2.1.254

 standby 10 priority 150

 standby 10 preempt

 standby 10 track 1 decrement 60

end

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Pay attention to "standby 10 track 1 decrement 60" which means it need to check more on "Track 1".

Let's check more from running-config.

DSW1#sh run | begin track

track 1 ip route 4.4.4.1 255.255.255.255 metric threshold

 threshold metric up 1 down 2

!

track 10 ip route 4.4.4.4 255.255.255.255 metric threshold

 threshold metric up 111 down 112

-----------------------

Two track objects are configured; track1 and track 10. Tracking objects are tracking to ip reachable to ip 4.4.4.4 which is the loopback IP of R4. 

Metric threshold means if it's reachable, default "UP" value is 254 and "DOWN" value is 255

So, current DSW1 track object is 1 and it's tracking route to 4.4.4.1 which is unavailable. That's why, current DSW1's priority value will be (150 - 60 = 90) which is lower than the DSW2, which has default value 100.

It's mentioned in DSW1 's "sh standby" output.

  Priority 90 (configured 150)

    Track object 1 state Down decrement 60

  IP redundancy name is "hsrp-Vl10-10" (default)

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To fix it, change standby 10 track 1 decrement 60  DSW1's interface vlan 10 as follow.

DSW1(config)#int vlan 10

DSW1(config-if)#no standby 10 track 1 decrement 60

DSW1(config-if)#standby 10 track 10 decrement 60

------------------

Check again in DSW1 whether it's active or not

DSW1#sh standby

Vlan10 - Group 10

  State is Active

    5 state changes, last state change 00:00:47

  Virtual IP address is 10.2.1.254

  Active virtual MAC address is 0000.0c07.ac0a

    Local virtual MAC address is 0000.0c07.ac0a (v1 default)

  Hello time 3 sec, hold time 10 sec

    Next hello sent in 0.116 secs

  Preemption enabled

  Active router is local

  Standby router is 10.2.1.2, priority 100 (expires in 8.184 sec)

  Priority 150 (configured 150)

    Track object 10 state Up decrement 60

  IP redundancy name is "hsrp-Vl10-10" (default)