BGP Multihoming 2 providers full or partial?

Mon Jun 1 21:51:22 UTC 2015

On Jun 01, 2015, at 17:46 , William Herrin <bill at herrin.us> wrote:
> On Mon, Jun 1, 2015 at 5:13 PM, Baldur Norddahl
> <baldur.norddahl at gmail.com> wrote:
>> This is only a problem if you use so called tier 1 transit providers.
>> 
>> The smaller fish in the pond have multiple transits themselves and will
>> there by always have an alternative route available.
> 
> Hi Baldur,
> 
> Cogent is not a tier 1 (not a "transit-free") provider last I heard.
> Maybe that's changed, but they weren't back when they had the
> week-long peering dispute with Sprint.

Cogent has no transit. Hasn’t for years.

During the peering outage, the only “transit” they had was to a single SFI network.

I make no comments about Cogent’s reliability or peering or etc.

— 
TTFN,
patrick

> Their business plan included
> preventing their routes from reaching Sprint via paid transit. If you
> were a customer of either carrier that week and you weren't multihomed
> with full routes, you were not a happy camper.
> 
> "Always" is such a strong. Yes, you're at higher risk if all your
> upstreams are "transit-free" but using only backbone providers who
> have paid upstream transit in their mix is no panacea.
> 
> Regards,
> Bill Herrin
> 
> 
> 
> -- 
> William Herrin ................ herrin at dirtside.com  bill at herrin.us
> Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>