[c-nsp] Basic inbound BGP path preferencing query

Vitaliy Shelehan vitaliy.shelehan at vegatele.com
Tue Jan 27 09:39:10 EST 2015

You can use as-path prepend to balancing inbound traffic in your directions.  

-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Joshua Riesenweber
Sent: Tuesday, January 27, 2015 3:29 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Basic inbound BGP path preferencing query

Hi all,
I'm looking for a bit of insight from someone with more BGP experience than me. (I've tried searching around the 'net trying to find an elegant solution.)
I have the common enterprise configuration of 2x WAN links multi-homed with 2x ISPs. I have a single /24 public IP allocation being advertised out both links, and are using MEDs  to preference one link.
I'd like to load balance across both links, unfortunately, one link is lower-bandwidth and has a smaller data quota from the ISP.One simple solution is upgrading to a /23. Then I can preference a unique /24 subnet over each link, and assign the large bandwidth-consuming devices to that particular subnet on my better WAN link.
My only hesitation is that configuration potentially uses more IP addresses than I need. Does anyone have any tips on preferencing certain IP addresses inbound through one link if I am only advertising a single /24?
If there's a better way of doing this your ideas are welcome. 

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