[c-nsp] Dual OC3 - Separate Carrier - Load-balancing 7201

[arulgobinath emmanuel]

" out of order could be a major headache, and throughput could suffer
greatly." I haven't tried nor experience in similar setup according to my
search MLPPP designed to handle the out of order packet (rfc1990)   but it
can impact the router performance & buffer space.
Gobinath


On Tue, Apr 5, 2011 at 3:38 AM, Justin M. Streiner
<streiner at cluebyfour.org>wrote:

> On Mon, 4 Apr 2011, Mark Mason wrote:
>
>  We are planning on terminating dual OC3 point-to-point circuits
>> (PA-POS-2OC3) from different carriers on 7201 NPE-G2's at two of our DC's
>> and do either HDLC CEF per packet load-balancing or multilink PPP bundle
>> together. What are some of the questions and responses from the field for
>> anyone who has done this type of setup?
>>
>
> I would stay away from per-packet load-sharing in this design, unless there
> is a really compelling reason to use it.  The biggest reason to stay away is
> that OC3 (technically, OC3c) circuits from different carriers to the same
> locations could have vastly different end-to-end latencies.  If they are
> significantly different, dealing with packets arriving out of order could be
> a major headache, and throughput could suffer greatly.
>
> You might also want to look at a Gigabit Ethernet solution, if that's an
> option and you're not chained to a POS design.  The operating costs of a
> pair of gig-e circuits could very well be substantially lower than a pair of
> OC3cs, with the added benefit of being able to provide a lot more bandwidth.
>  If you were to get two gig-e circuits, the caveat above related to
> per-packet load-sharing would still apply.
>
> In a POS world, if you need more than 155 Mb/s, you either need to install
> another POS circuit, or start upgrading to OC12c or higher.  That also
> throws in the need to purchase new router hardware, because the 7201 won't
> handle a POS OC12c, so your costs per megabit wouldn't scale too well.
>
> jms
>
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