[c-nsp] bonded T1s into 7206VXR

[Adam Greene]

Pete,

Thanks. The 5M fiber would be the Metro Ethernet, Ethernet Internet Access
(ENET) service from Time Warner Cable. Your info about VoIP is much
appreciated. I'll check that out on the 5M link I already have from another
provider (on which customers have reported some dropped packets).

--a

----- Original Message ----- 
From: "Pete Templin" <petelists at templin.org>
To: "Adam Greene" <maillist at webjogger.net>
Cc: <cisco-nsp at puck.nether.net>
Sent: Monday, February 21, 2005 5:08 PM
Subject: Re: [c-nsp] bonded T1s into 7206VXR


> 5M in what format?  Metro E?  Is it rate limited?
>
> Depending on your applications (i.e. VOIP), you might run into packet
> loss if your connection is rate limited, especially if the physical link
> is running at 100M.  Rate limiting typically looks at your traffic every
> 0.125 second.  As soon as you exceed your allotment (and any configured
> burst, if accrued) within each 0.125 second window, traffic will be
> dropped.  Hence if your link is running at 100M, sending >625kbps in
> 1/8th second could result in packet loss, even if your average rate is
> well below 5Mbps.
>
> Asking (contracting?) your provider to shape outbound (they'll have to
> rate-limit inbound, but you can shape outbound to appease their inbound
> rate limiter) would avoid the rate limiting problem, but could introduce
> jitter if some packets get deferred for 119ms (maximum).
>
> pt

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