RE: Is it true ? Dynamic nature of Internet - (Internet delay

It sounds like it could be just the dynamic nature of the internet you can't
control what you don't control! But seriously if you were concerned with the
RTT to particular destinations depending on your size it might be worth
getting into IXPs where they are and depending on your requirements start
doing some public or private peering, there may then be a lesser amount of
variables.

Also as you state the outbound pings/trace routes take the preferred path
which is probably from BGPs point of view and not the RTT time which is what
you are measuring. It might worth it to monitor the RTT times through a
number of your peers to see if there is a considerable variance and if so
adjust your route maps accordingly.

Bradley

> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> sakthi vadivel
> Sent: 12 February 2010 13:15
> To: Cisco certification
> Cc: smorris_at_internetworkexpert.com; maulik.p.parekh_at_gmail.com
> Subject: OT:Is it true ? Dynamic nature of Internet - (Internet delay
> in the path)
>
> Hi All,
>
> I am working in an ISP as a Network Specialist managing routing and
> switching. I am facing real time and interesting issue ,which i would
> like
> to share it with you all.
>
> We use Brix tool to maintain Customer SLA's by sending ping and trace
> route
> to the popular sites (ex:www.google.com) from different location inside
> the
> country (Exchanges).
>
> The issue here is , when Brix send trace route to destinations (ex:
> www.google.com),it takes most preferred path to reach the destination
> among
> all other peering links (direct TATA/NYK) , with in that particular BGP
> AS ,
> they have multiple IBGP session which connects to different part of
> US.And
> each time when my Brix try to trace route , the Popular sites (ex:
> www.google.com) address also changes due to more google servers and get
> resolved in the DNS lookup.
>
> What happens, whenever it sends trace route, the delay differs and NOT
> meeting the SLA.(above threshold value); even though i have enough
> bandwidth
> on my peering (STM4's and STM1's).
>
> Is there any way to make this right by getting the constant delay
> (Ex:200ms
> - 250ms) ? Or is this the nature of the internet? (Dynamic
> characteristics
> of the internet). (not by hard coding the stuff like having one address
> for
> each site www.google.com); Need a solution , not a work around.
>
> Need proper Technical explanation to debate on this. Or any links to
> dig
> into more. How other ISPs do maintain the SLA;s.
>
>
> [To be frank , i hate to see the NMS dashboard screen in my NOC .(more
> red
> blinking icons ,due to not meeting SLA) This is where the higher
> management
> people likes to point finger on technical people all the time. :)-]
>
> Regards,
>
> Sakthi
>
>
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Received on Fri Feb 12 2010 - 13:32:45 ART