[c-nsp] Load Balancing via BGP outbound at Colo

[Bruce Pinsky]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Loopback wrote:
> All
> 
> 
> We would appreciate some ideas for the best method of implementing limited
> traffic engineering via BGP for our current network.  We have two EBGP
> routers in the same physical location with and IBGP connection between them,
> each are dual homed to 3 Tier 1 ISP's and single homed to one other ISP.
> There is very little transit traffic, almost all is outbound responses from
> customer servers in our colo facility.
> 
> 
>   Router A
> 
> A -----------10Mb/s-------------- ISP #1
> A -----------10Mb/s---------------ISP #2
> A -----------10Mb/s---------------ISP #3 
> A -----------10Mb/s---------------ISP #10
> |
> |
> |  Router B
> |
> B -----------10Mb/s-------------- ISP #1
> B -----------10Mb/s---------------ISP #2
> B -----------10Mb/s---------------ISP #3
> B -----------10Mb/s---------------ISP #20 
> 
> 
> We currently do not enforce any PBR, our outbound route selection algorithm
> is default "shortest AS-PATH"  destination network with the addition of
> "BGP Multi-Path" so that any return traffic to routes with equal AS-Path 
> lengths will balance among all the connections with equal cost.
> 
> 
> We are going to upgrade the bandwidth on the "ISP #1" connection to a GbE on
> both routers and leave the others at the current bandwidth.  This will be 
> much less expensive connection per Mb/s, for that reason we would like to
> prefer it for the return path for all outbound traffic to any destination
> that does NOT originate from with the AS of one of our other directly 
> connected providers.  Our thoughts is that approach will combine both
> routing efficiency and economy.
> 
> The question is the best method to accomplish this using BGP, and preferably
> without having to coordinate MED's or Community values with our providers. 
> 
> Looking forward to hearing your opinions.
> 
> 


OER:

http://www.cisco.com/en/US/products/ps6441/products_configuration_guide_chapter09186a008047c67e.html

- --
=========
bep

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.4 (MingW32)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFF95gUE1XcgMgrtyYRAj2XAKDA996p3Q55ShNRZjrlAqcUMCJozQCgyEQh
h2/HT9gztPwJywokUzWVF70=
=B1/Y
-----END PGP SIGNATURE-----