IP SLA

[dominique.rossignol]

hi experts,

i read a lot of stuff about ip sla from cisco and others, and i'm confused

I thought that icmp-echo could not measure packet loss because packet loss cant be computed by the statistics that are collected by this sla operation

In this document

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla_icmp_echo.pdf

never it is written that IP SLA ICMP-Echo can measure packet loss

But in this document

http://etutorials.org/Networking/network+management/Part+II+Implementations+on+the+Cisco+Devices/Chapter+11.+IP+SLA/Operations+How+to+Measure/

I found that all IP SLA can measure common error statistics like number of failed operations due to a connection loss or timeout.

So i would know

- can IP SLA ICMP-Echo measure packet loss ?

- and can IP SLA ICMP-Echo measure hop by hop response time ? (i'm confused about this too)

Thank you

Best regards

[STD_NetWorld]

Hi dominique,

IP SLA is usually use to monitor Link/device status,

for manually check link status we are ping remote device IP ,same thing this is doing by your device via programming (Router/Switch/Firewall).

when you configure IP SLA ICMP-Echo ,it's sending ICMP packet to configured remote IP (with regular interval),once remote device not responding ICMP packet it's consider device/Link down.

[Larry Sullivan]

If I want my SLA to measure standard ICMP ping times I set timeout and threshhold to 2000 and freq to 2.  So essentially yes to #1.  To #2, yes as well, if your router can do  ICMP path echo SLAs. 

[mohamad ebrahimi]

Hi dominique . yes you can this work with ip sla.

Internet-Router(config)# ip sla 1
Internet-Router(config-sla)# icmp-echo 4.2.2.4 source-interface serial 0/0/0
Internet-Router(config-sla-echo)#frequency 3
Internet-Router(config)# ip sla schedule 1
Internet-Router(config)#ip sla schedule 1 life forever start-time now
Internet-Router(config)#track 1 ip sla 1
Internet-Router(config)#ip route 0.0.0.0 0.0.0.0 5.5.5.1 track 1
Internet-Router(config)#ip route 0.0.0.0 0.0.0.0 4.4.4.1 10