[cisco-voip] Extended Ping Anomaly

[Tim Smith]

Errors on your interfaces? Speed / duplex / cabling?

Sent from my iPhone

On 21/09/2010, at 4:33, Jim Reed <jreed at swiftnews.com> wrote:

> Here is the scenario.  I have a 2851 router in location A that is both a
> voice router and a Sprint dual T1 MPLS data WAN router.
>
> In location B, I have a 3845 router that services a few PtP T1s and a Sprint
> 9-Meg frac DS3 MPLS.  Location B has a separate 2851 voice router.
>
> If I do an extended ping from the 3845 router at location B to the 2851
> router at location A, I get a significant number of request timeouts.
>
> If I do an extended ping from the 2851 router at location B to the 2851
> router at location A, I don't get a single request timeout.
>
> These extended pings have been tried with different data patterns and I
> usually run five (5) sets that step through the sizes from 36 to 18024 for a
> total of about 90,000+ pings.
>
> I can also ping location A from a 3845 router at another location that is
> running a Sprint 6 x T1 MPLS without a single request timeout.
>
> This is a bizarre behavior that I have never seen before.  And it's even
> more perplexing because the pings from the 2851 router at location B have to
> run through the MPLS connection on the 3845 router at location B.
>
> Unfortunately, most of the resources that location A accesses are located at
> location B and are accessed via the Sprint MPLS network.  At first I
> suspected Sprint but then last night I just decided for grin and giggles to
> run the ping test from their voice router and the damn thing worked
> flawlessly even though the pings had to go from the 2851 through the 3845.
>
> Anyone got any thoughts.
>
> Thank You...
> --
> Jim Reed
> Manager of Technical Services
> Swift Communications, Inc.
> 970-384-9141 (Direct)
> 775-772-7666 (Cell)
> Sorry, no faxes accepted.
> Please send documents by eMail.
>
>
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