[c-nsp] RES: Outbound Load balancing using eBGP

[Leonardo Gama Souza]

Hi,

There is an approach of matching on LSB from the prefixes' octets of the
full routing table (even/odd) and increase local-preference for one
provider.

For example:

access-list 1 permit 0.0.0.0 255.254.254.255
access-list 2 permit 0.0.1.0 255.254.254.255
access-list 3 permit 0.1.0.0 255.254.254.255
access-list 4 permit 0.1.1.0 255.254.254.255 

route-map ISP1 permit 10
 match ip address 1 2
 set local-preference 120
route-map ISP1 permit 20
 match ip address 3 4
 set local-preference 110
route-map ISP1 permit 1000

route-map ISP2 permit 10
 match ip address 1 2
 set local-preference 110
route-map ISP2 permit 20
 match ip address 3 4
 set local-preference 120
route-map ISP2 permit 1000

Most likely you will achieve a good distribution of best paths and thus
outbound traffic among the transit providers. Moreover you can play with
the wildcard masks and the matching bits in order to improve the
distribution.


-----Mensagem original-----
De: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] Em nome de RAZ MUHAMMAD
Enviada em: segunda-feira, 20 de dezembro de 2010 19:30
Para: cisco-nsp at puck.nether.net
Assunto: [c-nsp] Outbound Load balancing using eBGP

Hi all,

I would like to find out how one can use BGP to load balance outbound
traffic, while multi homed to 2 transit providers or ISPs and getting
full
routing tables, no default routes? The BGP peer at the client end is a
non
Cisco router, so would not be able to use the multipath feature. The
load
balancing is intended for all routes in the routing table, or at least
to
achieve some kind of load distribution.

Is there any other way to achieve an optimal outbound load balancing
method
using eBGP?

Regards
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