[c-nsp] SLA tracking, what do you ping?

[Ziv Leyes]

I've answered this on a previous post, here's an example of what I use

======================================
ip sla monitor 1
 type echo protocol ipIcmpEcho 1.1.1.1
!
ip sla monitor schedule 1 life forever start-time now
!
track 1 rtr 1 reachability
!

ip sla monitor 2
 type echo protocol ipIcmpEcho 2.2.2.2
!
ip sla monitor schedule 2 life forever start-time now
!
track 2 rtr 2 reachability
!

ip route 10.0.0.0 255.255.255.0 1.1.1.1 100 name track 1
ip route 10.0.0.0 255.255.255.0 2.2.2.2 200 name track 2
======================================

As long as 1.1.1.1 is available, it's routing will be valid because the smaller administrative distance, if not, then the second one will become active.
In any case, you'll always see only one routing line in table.
You could add a few more using the same principle, just bear in mind, ip sla is a bit resource consuming, so you better not use it deliberately.

Hope this helps,
Ziv


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jay Nakamura
Sent: Wednesday, October 20, 2010 4:15 PM
To: cisco-nsp
Subject: Re: [c-nsp] SLA tracking, what do you ping?

On a side note, is there a way to ping several IPs and declare it down if, for example, 2 out of 3 is down?  I am mostly interested in removing default route via track command.

I read the documentation and couldn't find how you could do that but sometimes I just have one of those days.

2010/10/20 Ziv Leyes <zivl at gilat.net>:
> Yeah, something like "traceroute.org" which is always answering But 
> you better try to get a "closer" IP to ping, one that is reliable and 
> gives you indication of what should be working fine, something like 
> the provider's LNS you're connecting to, or the like
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Heath Jones
> Sent: Wednesday, October 20, 2010 10:23 AM
> To: Jay Nakamura
> Cc: cisco-nsp
> Subject: Re: [c-nsp] SLA tracking, what do you ping?
>
> Just ping 'the internet'... :)
>
>
> On 20 October 2010 02:35, Jay Nakamura <zeusdadog at gmail.com> wrote:
>> When you use IP SLA to track if an upstream is working on a ISP 
>> connection (From customer point of view, and you are not the ISP that 
>> knows what will be safe to ping), what do you usually configure to 
>> ping?  I have found that one hop up from the CPE is not necessary 
>> reliable on DSL/Cable.  I was wondering if anyone can share their 
>> experience on what works well and what to look out for.
>>
>> Thanks,
>> _______________________________________________
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>
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