RE: L3/HE/Inbound Pathing Question

[Brandon Lehmann]

If you're not familiar with how you can engineer traffic on L3's network
take a peek at
http://www.scn.rain.com/~neighorn/PDF/Traffic_Engineering_with_BGP_and_Level
3.pdf (slightly outdated but still useful)

As far as HE is concerned, when I asked them about communities a few weeks
ago all they could offer was a blackhole community.

However, as Jay said, you're likely at the mercy of the blended provider and
what they support.

> -Original Message-
> From: NANOG [mailto:nanog-boun...@nanog.org] On Behalf Of Jay Hennigan
> Sent: Monday, June 09, 2014 3:10 PM
> To: nanog@nanog.org
> Subject: Re: L3/HE/Inbound Pathing Question
> 
> On 6/9/14 9:38 AM, Dennis Burgess wrote:
> > I have ran into this a few times, and have not found a solution:
> >
> > L3 à
> >
> > HEà  --- blended Provider A --- > Customer
> >
> > Cogent -- > Customer
> >
> > Cogent of course is cheaper, and customer wishes to use the blended
> provder more as backup and/or have most of the inbound traffic coming
> in the cheaper path (cogent).  The issue appears to be L3 and HE
> specifically (of course they make up a good chunk of inbound traffic)
> always prefers their customer peers, so even if we advertise any prefix
> to the blended, those companies (l3/he) always choose to come in though
> the customer peer and then to my customer.
> >
> > Any thoughts on how to get around this, and still have some kind of
> route in the blended provider for failover?Off list is fine..
> Thanks in advance.
> 
> Advertise a community to the other providers to localpref your prefixes
> down to the point of being a backup.
> 
> 3356:70 should work for Level 3, you will need to talk to HE and/or
> your blended provider for what to use (and whether they support it).
> 
> 
> --
> --
> Jay Hennigan - CCIE #7880 - Network Engineering - j...@impulse.net
> Impulse Internet Service  -  http://www.impulse.net/ Your local
> telephone and internet company - 805 884-6323 - WB6RDV


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Re: L3/HE/Inbound Pathing Question

[Jay Hennigan]

On 6/9/14 9:38 AM, Dennis Burgess wrote:
> I have ran into this a few times, and have not found a solution:
>
> L3 à 
> 
> HEà  --- blended Provider A --- > Customer
>  
> Cogent -- > Customer
> 
> Cogent of course is cheaper, and customer wishes to use the blended provder 
> more as backup and/or have most of the inbound traffic coming in the cheaper 
> path (cogent).  The issue appears to be L3 and HE specifically (of course 
> they make up a good chunk of inbound traffic) always prefers their customer 
> peers, so even if we advertise any prefix to the blended, those companies 
> (l3/he) always choose to come in though the customer peer and then to my 
> customer.
> 
> Any thoughts on how to get around this, and still have some kind of route in 
> the blended provider for failover?Off list is fine.. Thanks in advance.  

Advertise a community to the other providers to localpref your prefixes
down to the point of being a backup.

3356:70 should work for Level 3, you will need to talk to HE and/or your
blended provider for what to use (and whether they support it).


-- 
--
Jay Hennigan - CCIE #7880 - Network Engineering - j...@impulse.net
Impulse Internet Service  -  http://www.impulse.net/
Your local telephone and internet company - 805 884-6323 - WB6RDV

L3/HE/Inbound Pathing Question

[Dennis Burgess]

I have ran into this a few times, and have not found a solution:

 

L3 à 

HEà  --- blended Provider A --- > Customer

 

Cogent -- > Customer

 

Cogent of course is cheaper, and customer wishes to use the blended provder 
more as backup and/or have most of the inbound traffic coming in the cheaper 
path (cogent).  The issue appears to be L3 and HE specifically (of course they 
make up a good chunk of inbound traffic) always prefers their customer peers, 
so even if we advertise any prefix to the blended, those companies (l3/he) 
always choose to come in though the customer peer and then to my customer.

 

Any thoughts on how to get around this, and still have some kind of route in 
the blended provider for failover?Off list is fine.. Thanks in advance.  

 

 

Dennis Burgess, Mikrotik Certified Trainer Author of "Learn RouterOS- Second 
Edition  "
 
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