[c-nsp] ipsla - latency - related to cellular backhaul

Waris Sagheer (waris) waris at cisco.com
Fri Apr 26 17:49:59 EDT 2013

I have customers who are migrating from IP SLA to Y1731 PM just because of accuracy reasons.
ASR9K, ASR903 & ME3600X-24CX & ASR901 offers hardware time stamping and PTP synchronization so you get much better accuracy and scale.
Y1731PM will allow you to calculate 2 way delay & jitter, 1 way delay using 2 Way DMM/DMR & Loss through SLM.
You can also use service activation & ethernet loopback to conduct throughput testing.

Best Regards,


Waris Sagheer
Technical Marketing Manager
Service Provider Access Group
waris at cisco.com<mailto:waris at cisco.com>
Phone: +1 408 853 6682
Mobile: +1 408 835 1389

CCIE - 19901


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From: "aaron1 at gvtc.com<mailto:aaron1 at gvtc.com>" <aaron1 at gvtc.com<mailto:aaron1 at gvtc.com>>
Date: Thursday, April 25, 2013 10:02 AM
To: "cisco-nsp at puck.nether.net<mailto:cisco-nsp at puck.nether.net>" <cisco-nsp at puck.nether.net<mailto:cisco-nsp at puck.nether.net>>
Subject: [c-nsp] ipsla - latency - related to cellular backhaul

I have seen some latency (measured using ipsla icmp/udp/mpls pw pings)
beyond my agreements with some of our cellular backhaul customers..

We are concerned that if/when they ask to see their sla measurements for
their cell towers that we won't be looking very good

Cisco Tac is telling me that pings of any type (icmp/udp/mpls pw) are not
the way to truly measure the network and that I should be using CFM/OAM type

I showed cisco tac a mpls pw ping test I did and it shows drops/time-outs
occasionally (!!!!!!.!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!

Tac says that this drop and the latency seen using various ipsla pings is
expected since all pings are treated less than everything else and could be
getting policed by LPTS (I don't know what LPTS is)

What do y'all think about all this?


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