[103989] in North American Network Operators' Group
Re: [Nanog] Cogent Router dropping packets
daemon@ATHENA.MIT.EDU (manolo)
Mon Apr 21 16:04:34 2008
Date: Mon, 21 Apr 2008 16:02:48 -0400
From: manolo <mhernand1@comcast.net>
To: Joe Greco <jgreco@ns.sol.net>
In-Reply-To: <200804211954.m3LJsenD047076@aurora.sol.net>
Cc: nanog@merit.edu
Errors-To: nanog-bounces@nanog.org
I do have to say that the PSI net side of cogent is very good. We use
them in Europe without many issues. I stay far away from the legacy
cogent network in US.
Manolo
Joe Greco wrote:
>> Joe Greco wrote:
>>
>>> For those unfamiliar, Cogent has a system where you set up an EBGP peering
>>> with the Cogent router you're connected to, for the purposes of announcing
>>> your routes into Cogent. However, these are typically smaller, aggregation
>>> class routers, and do not handle full tables - so you don't get your routes
>>> from that router. To get a full table FROM Cogent, you need to set up an
>>> EBGP multihop session with them, to their nearest full-table router. I
>>> believe they actually do all their BGP connections in that manner.
>>>
>> Depends on the service you purchase. Fast Ethernet seems to be delivered
>> as eBGP-multihop (the first hop is just a L3 switch), however DS-3 is
>> handled as a single BGP session. I'm not sure if GigE or SONET services
>> are handled as multihop or not.
>>
>
> GigE is, though perhaps not in all cases (we had a client buying x00Mbps
> delivered over gigE, which was definitely multihop).
>
>
>> Probably all depends what hardware they have at each POP....
>>
>
> In part, I'm sure. There is also a certain benefit to having consistency
> throughout your network, and it sometimes struck me that many of the folks
> working for Cogent had a bit more than average difficulty dealing with the
> unusual situation. This is not meant harshly, btw. Generally I like the
> Cogent folks, but they (and their products) have their faults, just as any
> of the competition does.
>
> It may also help to remember that there's "legacy" Cogent and then there's
> PSI/etc. Perhaps there are some differences as a result.
>
> The more things you can do using the same template, the less difficult it
> is to support. On the flip side, the less flexible you are ...
>
> ... JG
>
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