I'm beginner, and I have problems with BGP. I don't really understand why it doesn't work correctly.
This is my topology:
I need to ping from R8 to R10.
This is the configuration of R8:
!
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R8
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
no ip icmp rate-limit unreachable
!
!
ip cef
no ip domain lookup
!
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
ip tcp synwait-time 5
!
!
!
!
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
!
interface Serial1/0
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/1
ip address 199.168.1.9 255.255.255.252
serial restart-delay 0
!
interface Serial1/2
ip address 50.1.0.1 255.0.0.0
serial restart-delay 0
!
interface Serial1/3
ip address 199.168.1.2 255.255.255.252
serial restart-delay 0
!
interface FastEthernet2/0
no ip address
shutdown
duplex half
!
interface FastEthernet3/0
no ip address
shutdown
duplex half
!
interface FastEthernet4/0
no ip address
shutdown
duplex half
!
interface Serial5/0
ip address 199.168.1.22 255.255.255.252
serial restart-delay 0
!
interface Serial5/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial5/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial5/3
no ip address
shutdown
serial restart-delay 0
!
router eigrp 1
redistribute bgp 100 metric 100 100 100 100 100
network 199.168.1.0 0.0.0.3
network 199.168.1.8 0.0.0.3
network 199.168.1.20 0.0.0.3
auto-summary
!
router bgp 100
no synchronization
bgp log-neighbor-changes
network 50.1.0.0 mask 255.255.255.0
neighbor 50.1.0.2 remote-as 200
neighbor 50.1.0.2 next-hop-self
neighbor 199.168.1.1 remote-as 100
no auto-summary
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
!
no cdp log mismatch duplex
!
!
!
!
control-plane
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
stopbits 1
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
stopbits 1
line vty 0 4
login
escape-character 3
line vty 5 15
login
escape-character 3
!
!
end
This one is the configuration of R10:
!
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R10
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
no ip icmp rate-limit unreachable
!
!
ip cef
no ip domain lookup
!
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
ip tcp synwait-time 5
!
!
!
!
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
!
interface Serial1/0
ip address 50.1.0.2 255.0.0.0
serial restart-delay 0
!
interface Serial1/1
ip address 195.16.1.10 255.255.255.252
serial restart-delay 0
!
interface Serial1/2
ip address 195.16.1.22 255.255.255.252
serial restart-delay 0
!
interface Serial1/3
ip address 195.16.1.13 255.255.255.252
serial restart-delay 0
!
interface FastEthernet2/0
no ip address
shutdown
duplex half
!
interface FastEthernet3/0
no ip address
shutdown
duplex half
!
interface FastEthernet4/0
no ip address
shutdown
duplex half
!
router eigrp 2
redistribute bgp 200 metric 100 100 100 100 100
network 195.16.1.8 0.0.0.3
network 195.16.1.12 0.0.0.3
network 195.16.1.20 0.0.0.3
auto-summary
!
router bgp 200
no synchronization
bgp log-neighbor-changes
network 50.1.0.0 mask 255.255.255.0
redistribute eigrp 2
neighbor 50.1.0.1 remote-as 100
neighbor 50.1.0.1 next-hop-self
neighbor 195.16.1.14 remote-as 200
no auto-summary
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
!
no cdp log mismatch duplex
!
!
!
!
control-plane
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
stopbits 1
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
stopbits 1
line vty 0 4
login
!
!
end
When I run the command, show ip bgp in R8, I have:
R8#show ip bgp
BGP table version is 7, local router ID is 199.168.1.22
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
* i195.16.1.0/30 20.1.0.2 0 100 0 200 ?
*> 50.1.0.2 2681856 0 200 ?
* i195.16.1.4/30 20.1.0.2 2681856 100 0 200 ?
*> 50.1.0.2 2681856 0 200 ?
* i195.16.1.8/30 20.1.0.2 2681856 100 0 200 ?
*> 50.1.0.2 0 0 200 ?
* i195.16.1.12/30 20.1.0.2 0 100 0 200 ?
*> 50.1.0.2 0 0 200 ?
* i195.16.1.16/30 20.1.0.2 0 100 0 200 ?
*> 50.1.0.2 2681856 0 200 ?
* i195.16.1.20/30 20.1.0.2 2681856 100 0 200 ?
*> 50.1.0.2 0 0 200 ?
Please help me.
Best Answer
You have not set the clock rate on the DCE side of the connection. The command is
clock rate <rate>. See Cisco IOS Interface and Hardware Component Command Reference.Another problem is that you have a network statement that does not match the actual network. Your interfaces are in the
50.1.0.0/8network, but your BGP network statement is for the50.1.0.0/24network. BGP will only advertise the exact network that exists in the routing table, and if the network statement doesn't match, it will not be advertised.You are also creating a routing loop with your redistribution. eBGP has a lower AD than EIGRP so any routes received from both will prefer eBGP. You should be careful about redistribution. You can use tags and communities to prevent receiving routes originating in your AS from being received from a different AS, or you can drop the redistribution in BGP and only use network statements.