IP SLA question

Answered Question
Sep 10th, 2008
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Good day Friends,


I have the below network setup


Corporate Router -> Dsl modem -> Telco cloud -> Head Quarters


As a backup, we have ISDN link.


Now,we have setup IP SLA track to use ICMP echo to ping a server in headquaters. And if there is no reply, to trigger the ISDN.


Now the problem is, since we are using DSL connection, out of 15 or 20 pings, there is 1 timeout even though the connection is up. IP SLA just considers this 1 timeout and triggers the ISDN thinking that the DSL link is down.


So i am looking for a way in which IP SLA considers about 3-10 timeouts before triggering the backup ISDN.


Thanks in advance for your inputs.


Regards,

Manoj

Correct Answer by mvsheik123 about 8 years 7 months ago

Hi,


You need to use the 'track' feature also.


track 123 rtr 1 reachability

delay down 120 up 60

!

ip sla schedule 1 life forever start-time now

!


120/60 are in seconds.


With teh above statement, incase if the A.B.C.D not available for 2Mins, it will take backup backup path. When A.B.C.D reachable again , in 1Min, it fall back to original path.


hth

Thank you

MS

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francisco_1 Wed, 09/10/2008 - 22:50
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cant you sets the amount of time an IP SLAs operation waits for a response from its request packet in timeout milliseconds


Example:

Router(config-sla-monitor-echo)# timeout 10000


Manoj Wadhwa Sat, 09/13/2008 - 01:18
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Hi,


I have the below config setup on the router


ip sla monitor 1

type echo protocol ipIcmpEcho A.B.C.D

timeout 1000

threshold 2

frequency 3



Even after making alterations in the timeout and frequent, am still facing the same problem. ISDN still triggers.


My requirement is if there is consecutive 3 or 5 packet drops, only then the router should consider DSL to be down and trigger ISDN. I tested with the below two commands too but still seem no luck. Any further suggestions please.



ip sla reaction-configuration 2 react timeout threshold-type consecutive action-type trapOnly


ip sla reaction-configuration 2 react connectionLoss threshold-type xOfy 5 10 action-type trapOnly



Regards,

Manoj

Correct Answer
mvsheik123 Mon, 09/15/2008 - 11:01
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  • Gold, 750 points or more

Hi,


You need to use the 'track' feature also.


track 123 rtr 1 reachability

delay down 120 up 60

!

ip sla schedule 1 life forever start-time now

!


120/60 are in seconds.


With teh above statement, incase if the A.B.C.D not available for 2Mins, it will take backup backup path. When A.B.C.D reachable again , in 1Min, it fall back to original path.


hth

Thank you

MS

Manoj Wadhwa Mon, 09/22/2008 - 22:05
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Hi MS,


Apologize for my late reply. Your solution has made wonders to a long time pending issue. We implemented this and monitored for a week and this perfectly meets our requirements. Thanks a lot for your solution and truly appreciate your time. Cheers!!


Regards,

Manoj

alejandrosedeno Tue, 10/28/2008 - 04:45
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Hi,


I have the same problem. Where do I put the track option?.


This is my configuration:


default route ATM

ip route 0.0.0.0 0.0.0.0 atm0.1

ip route 0.0.0.0 0.0.0.0 dialer1 track 123


the route dialer1 is the backup


is correct?


regards.

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