[c-nsp] Upstream BGP Traffic Engineering

[Alexandra Alvarado]

Hello,

 

I would like to do traffic engineering with the upstream of 155 Mbps, I have
3 DS3 each one with a BGP with the provider in different routers.  I would
like to separate the upstream by network in three groups, one per DS3, I
couldn't find any example with networks, but I had a reply of a mail sent
before about configure the upstream regarding the AS.  At the end is the
router1 configuration, the problem is that I don't want to load balancing
upstream traffic I need to assign some networks for ISP 2a and another for
ISP 2b.

 

 

Thanks

 

Alexandra Alvarado

 

 

Topology Description:  Router1 (AS19169) has connected directly the ISP 1
(AS 12956), the second link has two routers in the middle RM1 and RM2, and
Router1 has IBGP session with these routers, RM2 has directly connected to
the ISP 2 (27765).  The third DS3 is an IBGP session between 4 routers in
the middle Router2, RM3, RM4, RM1, and Router 1 has IBGP session with these
routers, RM1 has directly connected to the second DS3 to the ISP 2 (27765).

 

 


                        (ISP 1 AS 12956)
(ISP 2a 27765)                (ISP 2b 27765)

                            |
|                                       |

Router 1 (AS19169) ---------- ---------- ---------- ---------- ----------
---------- ---------- --- RM1 (AS19169) ---------- RM2 (AS19169)

                            |
|

                            |
|

                        Router 2 (AS19169) ---------- RM3 (AS19169)
---------- RM4 (AS19169) --------- -----------

 

 

Path1: Router1 - ISP 1

Path2: Router1 - RM1 - RM2 - ISP 2b

Path3: Router1 - RM3 - RM4 - RM1 - ISP2a

 

 

 

 ROUTER1 CONFIG

 

ip as-path access-list 2 permit .*
ip as-path access-list 5 permit _12956_
ip as-path access-list 6 permit _27765_
 
route-map PEER-A-IN permit 5
match as-path 5
set local-preference 120
 
route-map PEER-A-IN permit 10
match as-path 6
set local-preference 110
 
route-map PEER-A-IN permit 15
match as-path 2
set local-preference 100
 
 
 
route-map PEER-B-IN permit 5
match as-path 6
set local-preference 120
 
route-map PEER-B-IN permit 10
match as-path 5
set local-preference 110
 
route-map PEER-B-IN permit 15
match as-path 2
set local-preference 100
 
 
 
route-map PEER-C-IN permit 5
match as-path 6
set local-preference 120
 
route-map PEER-C-IN permit 10
match as-path 5
set local-preference 110
 
route-map PEER-C-IN permit 15
match as-path 2
set local-preference 100
 
 
router bgp 19169
neighbor peer.a.ip route-map PEER-A-IN in
neighbor peer.b.ip route-map PEER-B-IN in
neighbor peer.c.ip route-map PEER-C-IN in