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

[Matthew Crocker]

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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