[c-nsp] Inverse multiplexing DS3s to larger interfaces?

[Peyton Koran]

It didn't sound like they were using POS.  Using a full DS3 (whether it is
channelized or not) you could use ATM to bond several DS3s via a Knetrox an
introduce them to a OC-12 interface on different PVCs.

Tom, are you using POS?  Is that what you meant by Packet over DS3?
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Peyton Koran
Uplogix, Inc.
512-857-7026
pkoran at uplogix.com


> From: Matthew Crocker <matthew at crocker.com>
> Date: Wed, 23 Feb 2005 15:26:55 -0500
> To: NSP Nsp <cisco-nsp at puck.nether.net>
> Subject: Re: [c-nsp] Inverse multiplexing DS3s to larger interfaces?
> 
> 
> This most likely will not work. A  POS-OC12 card is an OC-12c and
> cannot be 'channelized',  it cannot be chopped up into 12 STS1s.  A
> CHOC-12-DS3 card is an OC-12 card which is channelized and can be
> chopped up into STS1s (DS3 + SONET wrapper).  With a CHOC-12 you will
> still see each individual DS-3 in the router with individual interfaces
> and the same 8 interface limit applies.  If you have DS-3 hand off from
> your carrier then you the carrier must have some type of fiber mux
> nearby.  DS-3 can only run 400 feet on coax.  I would force your
> carrier to support/provide OC-n service of the correct size for your
> needs.  GigE would probably be better if you can swing it.
> 
> -Matt
> 
> 
> 
> 
> On Feb 23, 2005, at 2:43 PM, Peyton Koran wrote:
> 
>> You could use a DS3 to OC12 Multiplexer from someone like Kentrox.
>> Then
>> bond the different circuits from each vendor, and create sub
>> interfaces.
>> This would not completely remove your problem, but it would give you
>> less of
>> one.
>> -----------------------------------------------------------------------
>> -----
>> -----------------------------------------------------------------------
>> -----
>> Peyton Koran
>> Uplogix, Inc.
>> 512-857-7026
>> pkoran at uplogix.com
>> 
>> 
>>> From: "Anthony D Cennami" <acennami at neupath.com>
>>> Date: Wed, 23 Feb 2005 13:32:38 -0500 (EST)
>>> To: "Thomas D.Simes" <simestd at netexpress.com>
>>> Cc: cisco-nsp at puck.nether.net
>>> Subject: Re: [c-nsp] Inverse multiplexing DS3s to larger interfaces?
>>> 
>>> Your carrier(s) will need to support the layer 2 imux solution on
>>> their
>>> end as well, not the same thing as l3 load balancing or virtual
>>> channels.
>>> 
>>> an ons will obviously support this, but your carrier would have to
>>> perform
>>> the same thing on their end; whatever the equipment you use.
>>> 
>>> 
>>>> 
>>>> We've currently got a pair of GSRs tied together with 7 DS3s from two
>>>> different carriers and are load balancing via OSPF.  This
>>>> method has worked pretty well, but the technique tops out at
>>>> maximum-paths 8 on the GSR.
>>>> 
>>>> I'm looking for a more scalable way to multiplex these DS3s into
>>>> something larger and feed them into my GSRs to reduce the number of
>>>> layer 3 paths between the two locations.
>>>> 
>>>> Going to larger interfaces is currently not an option with one of the
>>>> carriers, and we want to maintain dual carriers for redundancy if
>>>> possible.  We're currently using the 6 Port Packet over DS3 cards and
>>>> the interfaces don't support multilink PPP or multilink frame-relay.
>>>> 
>>>> What have folks used that worked well for this application?
>>>> 
>>>> The Cisco ONS 15454 using enhanced DS3 cards looks like it
>>>> might be a possibility, but I don't have any experience with the
>>>> platform.
>>>> 
>>>> TIA!
>>>> 
>>>> --
>>>> Tom
>>>> 
>>>> =====================================================================
>>>> =
>>>>    "Z-80 system stack overflow.  Shut 'er down Scotty, the system's
>>>>          sucking mud" - Error message on TRS 80 Model-16B
>>>> 
>>>> Thomas D. Simes
>>>> simestd at netexpress.com
>>>> =====================================================================
>>>> =
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>>> 
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