Solved: failed ccnp tshoot,

sarahr202 · ‎03-13-2013

Hi everybody.

How is everybody doing? Good news I failed the CCNP tshoot today. Actually, I failed all CCNP exams the first time. I am going to retry in a week.

I ran out of time at trouble ticket 7.

Hopefully, I will not disappoint you guys next time.

A quick question.

Router(config)# track 15 ip route 10.4.4.4 255.255.255.4 metric threshold

Router(config-track)# threshold up 99 down 201

that is what the book says:

For value lessthan or equal to 99, tracking object will be up

For value greater than or equal to 201, tracking object will be down.

Let suppose for some reason , metric to 10.4.4.4/28 changes such that the value becomes 200.

Will tracking object go down or it stay up?

thanks and have a great day.

nickbonifacio · ‎03-13-2013

Hi Sarahr,

Sorry to hear about your test. Don't give up!

I changed the IP and masks a little bit, hopefully this is OK?

track 14 ip route 10.4.4.4 255.255.255.255 metric threshold

threshold metric up 99 down 201

R1(config)# ip route 10.4.4.4 255.255.255.255 1.1.1.1 200

*Mar 1 00:04:36.843: %TRACKING-5-STATE: 14 ip route 10.4.4.4/32 metric threshold Down->Up

R1(config)#do sh ip route

[...]

1.0.0.0/24 is subnetted, 1 subnets

C 1.1.1.0 is directly connected, FastEthernet0/0

10.0.0.0/32 is subnetted, 1 subnets

S 10.4.4.4 [200/0] via 1.1.1.2

R1(config)#do sh track

Track 14

IP route 10.4.4.4 255.255.255.255 metric threshold

Metric threshold is Up (static/0/1)

4 changes, last change 00:03:43

Metric threshold down 201 up 99

First-hop interface is FastEthernet0/0

Is this what you were after?

Nick Bonifacio
CCIE #38473

Nick Bonifacio CCIE #38473

View solution in original post

siddhartham · ‎03-13-2013

Hi Sarah,

I am really sorry to hear about your test,you will definately get it next time....

Below is good explanantion by Peter Paluch about the threshold command

track 10 ip route 10.2.21.128/25 metric threshold                   
 threshold metric up 20 down 50

If the metric of the route is 20 or less, the entire tracking object 10 is in the valid state. Now, if the metric of the route starts to increase, the tracking object 10 will be in the valid state until the metric grows to the value 50. If the metric becomes 50 or more, the track object 10 will flip to the invalid state.

Assume now that the route metric will again start to decrease. It will decrease below 50 but the object will still remain in the invalid state. It will decrease further, and when it reaches 20 or less, the tracking object will once again become active.

Thus, the range between the up and down threshold creates a hysteresis field that may help to dampen unnecessary state changes and provide a certain degree of reserve in the tracked value once the object flips its state again.

https://supportforums.cisco.com/thread/2061103

Siddhartha