[nsp] BGP, best way to balance outgoging traffic

[Lucas Iglesias]

If so, it will look for a matching entry in the routing table (exactly the
same behavior as the traffic not permitted by the ACL).

-----Mensaje original-----
De: Mahesh S [mailto:mahesh_s at stpb.soft.net]
Enviado el: Martes, 05 de Agosto de 2003 01:40 a.m.
Para: Lucas Iglesias; 'Lukas Krattiger'; cisco-nsp at puck.nether.net
Asunto: RE: [nsp] BGP, best way to balance outgoging traffic


Hi,

What will happen if the next hop is inaccessible for some reason??

Mahesh.S

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net]On Behalf Of Lucas Iglesias
Sent: Monday, August 04, 2003 8:09 PM
To: 'Lukas Krattiger'; cisco-nsp at puck.nether.net
Subject: RE: [nsp] BGP, best way to balance outgoging traffic


You can do this with policy-routing (be careful, it can load your CPU).
An example would be this one:

route-map RM_OUTGOING1 permit 10
 match ip address 1
 set ip next-hop 192.168.1.1 192.168.1.5
!
route-map RM_OUTGOING2 permit 10
 match ip address 2
 set ip next-hop 192.168.1.5 192.168.1.1
!

Assuming that 192.168.1.1 is the next-hop from a + b and 192.168.1.5 is from
c + d (the set ip next-hop allow you to put next-hops in order, if the first
is not reachable use the next one).
ACL 1 must permit one group of IP source nets, and ACL 2 the other one.
Finally, you must apply the route-maps to all the incoming customer
interfaces, i.e.:

interface Serial5/0/1
 ...
 ip policy route-map RM_OUTGOING1
end

interface Serial5/0/2
 ...
 ip policy route-map RM_OUTGOING2
end

Good Luck.
========================
Eng. Lucas Iglesias
IP Engineering, Tiba S.A.
========================




-----Mensaje original-----
De: Lukas Krattiger [mailto:luk at everyware.ch]
Enviado el: Lunes, 04 de Agosto de 2003 06:44 a.m.
Para: cisco-nsp at puck.nether.net
Asunto: [nsp] BGP, best way to balance outgoging traffic


Greetings,

We are currently running our BGP with 4 upstreams and anounceing 6 prefixes.
The advertisement of this 4 prefixes over upstream a + b and 2 prefixes
over upstream c + d are working fine.
What's now the best way to tell the outgoing traffic from all of this 2
prefixes must take upstream c + d and the other 4 prefixes are only allowed
to use upstream a + b ?
Any examples ?

Best Regards
-Lukas

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