Is it possible to monitor packet drop without any configuration required at ISP end?

[sunithaeswarappa]

Hi All,

Is there any way by which we can monitor packet drop on a internet link without any configuration required at ISP end. Kindly advice. Thanks!

Regards

Sunitha

[smitesh kharecha]

Hi Sunitha,

Yes.

IP SLA is your solution.

Regards,

Smitesh

[sunithaeswarappa]

Hi Smitesh,

Thanks for your quick response. As per my understanding, we need to configure ISP end as IP SLA responder... so this requires configuration at ISP end.

Do you my explaining how this could be achieved.

Thanks!

Regards

Smitesh

[smitesh kharecha]

Hi Sunitha,

Responder is not neccesaarily required.

Lets assume topology as

R1 --- R2 --- R3

We would be running imcp-echo from R1 loopback (1.1.1.1) to R3's loopback (3.3.3.3)

R1#sh run | sec ip sla

ip sla 1

icmp-echo 3.3.3.3 source-interface Loopback0

frequency 5

ip sla schedule 1 life forever start-time now

R1#

R1#sh ip sla statistics details

Round Trip Time (RTT) for       Index 1

        Latest RTT: 71 milliseconds

Latest operation start time: *00:12:41.799 UTC Fri Mar 1 2002

Latest operation return code: OK

Over thresholds occurred: FALSE

Number of successes: 57

Number of failures: 7

Operation time to live: Forever

Operational state of entry: Active

Last time this entry was reset: Never

Now, see the results, when I have shutdown the link between R2 and R3.

R1#sh ip sla statistics details

Round Trip Time (RTT) for       Index 1

        Latest RTT: NoConnection/Busy/Timeout

Latest operation start time: *00:13:41.799 UTC Fri Mar 1 2002

Latest operation return code: Timeout

Over thresholds occurred: FALSE

Number of successes: 68

Number of failures: 8

Operation time to live: Forever

Operational state of entry: Active

Last time this entry was reset: Never

There are two things to notice,

1. Latest RTT

2. Number of success and Failure.

From which you can deduced whether the packets were dropped or not.

HTH,

Smitesh

[sunithaeswarappa]

Hi Smitesh,

Will try to implement and let you if this works. Thanks again :-)

Regards

Sunitha

[sunithaeswarappa]

Hi Smitesh,

Is there any way in which the snmp will trigger only when the packet loss is 80%...

Regards

Sunitha

[smitesh kharecha]

Hi Sunitha,

As far as I know, there is snmp mib for IP SLA (though I don't know those MIB values), which then you  can configure the threshold in your NMS.

Another way you can do it is via EEM.

Unfortunately, I'm not  good in EEM

Regards,

Smitesh

[sunithaeswarappa]

Hi Smitesh,

I'll search for it. Thanks!

Regards

Sunitha

[smitesh kharecha · Accepted solution]

Hi Sunitha,

Check the below link

http://www.cisco.com/en/US/docs/ios/12_4/ip_sla/configuration/guide/hsthresh.html

Regards,

Smitesh