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BGP USING LOCAL_PREF & MED ATTRIBUTES

Posted on 2009-04-01
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Last Modified: 2012-05-06
i have configured 3 routers:

sanjose3 - main router
ISP1A - another route path
ISP1B - another route path

ive now added:

- a local_pref on ISP1A
- & a badmetric on ISP1A
- a goodmetric on ISP1B

- always compare on Sanjose3
sanjose3 - then "clear ip bgp *"
sanjose3 - then "sh ip bgp"

sanjose3#sh ip bgp
BGP table version is 2, local router ID is 200.100.50.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*> 200.100.50.0     0.0.0.0                  0         32768 i
sanjose3#

1.  according to my instructions after doing the "sh ip bgp" command, im supposed to see on sanjose3 2 paths to the 10.0.0.0 network but each path should have different metrics.  why can I only see one path as above?
-----------------------------------------------------
Building configuration...

Current configuration : 799 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname sanjose3
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
!
!
!
!
interface Ethernet0
 ip address 200.100.50.1 255.255.255.0
!
 interface Serial0
 ip address 192.168.1.6 255.255.255.252
 clock rate 56000
 no fair-queue
!
interface Serial1
 ip address 172.24.1.17 255.255.255.252
 clock rate 56000
!
interface BRI0
 no ip address
 encapsulation hdlc
 shutdown
!
router bgp 300
 no synchronization
 bgp always-compare-med
 bgp log-neighbor-changes
 network 200.100.50.0
 neighbor 172.24.1.18 remote-as 400
 neighbor 192.168.1.5 remote-as 200
 no auto-summary
!
ip http server
ip classless
!
!
!
!
line con 0
line aux 0
line vty 0 4
 login
!
end

sanjose3#
---------------------------------------
Building configuration...

Current configuration : 878 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname ISP1A
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
!
!
!
!
interface Ethernet0
 no ip address
 shutdown
!
interface Serial0
 ip address 192.168.1.5 255.255.255.252
 no fair-queue
!
interface Serial1
 ip address 10.1.1.1 255.255.255.252
 clock rate 56000
!
router bgp 200
 no synchronization
 bgp log-neighbor-changes
 network 10.0.0.0
 neighbor 10.1.1.2 remote-as 400
 neighbor 10.1.1.2 route-map viaAS400 in
 neighbor 192.168.1.6 remote-as 300
 neighbor 192.168.1.6 route-map badmetric out
 no auto-summary
!
ip http server
ip classless
!
!
!
route-map viaAS400 permit 10
 set local-preference 150
!
route-map badmetric permit 10
 set metric 150
!
!
line con 0
 exec-timeout 0 0
line aux 0
line vty 0 4
 login
!
end

ISP1A#
--------------------------------
Building configuration...

Current configuration : 825 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname ISP1B
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
!
!
!
!
interface Ethernet0
 no ip address
 shutdown
!
interface Serial0
 ip address 172.24.1.18 255.255.255.252
 no fair-queue
!
interface Serial1
 ip address 10.1.1.2 255.255.255.252
!
interface BRI0
 no ip address
 encapsulation hdlc
 shutdown
!
router bgp 400
 no synchronization
 bgp log-neighbor-changes
 network 10.0.0.0
 neighbor 10.1.1.1 remote-as 200
 neighbor 172.24.1.17 remote-as 300
 neighbor 172.24.1.17 route-map goodmetric out
 no auto-summary
!
ip http server
ip classless
!
!
!
route-map goodmetric permit 10
 set metric 50
!
!
line con 0
 exec-timeout 0 0
line aux 0
line vty 0 4
 login
!
end

ISP1B#
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Question by:mikey250
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3 Comments
 
LVL 43

Accepted Solution

by:
JFrederick29 earned 500 total points
ID: 24041966
Change the network statement on ISP1A and ISP1B to the following:

ISP1A:

router bgp 200
no network 10.0.0.0
network 10.1.1.0 mask 255.255.255.252

ISP1B:

router bgp 400
no network 10.0.0.0
network 10.1.1.0 mask 255.255.255.252
0
 
LVL 43

Expert Comment

by:JFrederick29
ID: 24091218
Did my comment take care of this?
0
 

Author Comment

by:mikey250
ID: 24105583
apologies for taking so long to reply. my account has not been accessible until today.

yes this did rectify the problem.  my instructions were wrong and i will have to whatch out for this kind of error in my instructions.
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