mikey250
asked on
BGP USING LOCAL_PREF & MED ATTRIBUTES
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#
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#
ASKER CERTIFIED SOLUTION
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Did my comment take care of this?
ASKER
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.
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.