01-06-2013 03:53 AM - edited 03-04-2019 06:35 PM
Could someone please explain to me why I can not route between router R1 and R5.
Any help at all would be greatly appreciated.
Here is the ip bgp table from R1
R1#
R1#sh ip bgp
BGP table version is 7, local router ID is 100.1.1.1
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
*>i50.1.1.0/24 4.4.4.4 0 700 0 6500 i
*> 100.1.1.0/24 0.0.0.0 0 32768 i
*>i200.1.1.0 4.4.4.4 0 700 0 6500 ?
*>i200.1.3.0 4.4.4.4 0 700 0 6500 ?
*>i200.1.5.0 4.4.4.4 0 700 0 6500 ?
*>i200.1.7.0 4.4.4.4 0 700 0 6500 ?
R1#
*********************************************************************
The topology and BGP configuration files are listed below.
The following is how I have it configured AS 5500
I am running BGP and OSPF on R1 and R4. On router R3 and R2 I am only running OSPF.
The OSPF protocol is only advertising the following networks:
10.1.12.0/29
10.1.13.0/29
10.1.24.0/29
10.1.34.0/29
10.1.45.0/29
10.1.46.0/29
1.1.1.1/32
4.4.4.4/32
100.1.1.0/24
************************************
R1 Config
interface Loopback1
ip address 1.1.1.1 255.255.255.255
!
interface Loopback100
ip address 100.1.1.1 255.255.255.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 10.1.13.1 255.255.255.248
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
ip address 10.1.12.1 255.255.255.248
clock rate 2000000
!
interface Serial0/2
no ip address
shutdown
clock rate 2000000
!
interface Serial0/3
no ip address
shutdown
clock rate 2000000
!
router ospf 1
log-adjacency-changes
network 1.1.1.1 0.0.0.0 area 0
network 10.1.12.0 0.0.0.7 area 0
network 10.1.13.0 0.0.0.7 area 0
network 100.1.1.0 0.0.0.255 area 0
!
router bgp 5500
no synchronization
bgp log-neighbor-changes
network 100.1.1.0 mask 255.255.255.0
neighbor 4.4.4.4 remote-as 5500
neighbor 4.4.4.4 ebgp-multihop 5
neighbor 4.4.4.4 update-source Loopback1
no auto-summary
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
!
******************************************
R4 Config
!
!
interface Loopback4
ip address 4.4.4.4 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 10.1.46.1 255.255.255.248
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
ip address 10.1.34.2 255.255.255.248
clock rate 2000000
!
interface Serial0/2
ip address 10.1.24.2 255.255.255.248
clock rate 2000000
!
interface Serial0/3
ip address 10.1.45.1 255.255.255.248
clock rate 2000000
!
router ospf 1
log-adjacency-changes
redistribute connected subnets
network 4.4.4.4 0.0.0.0 area 0
network 10.1.24.0 0.0.0.7 area 0
network 10.1.34.0 0.0.0.7 area 0
!
router bgp 5500
no synchronization
bgp default local-preference 700
bgp log-neighbor-changes
neighbor 1.1.1.1 remote-as 5500
neighbor 1.1.1.1 update-source Loopback4
neighbor 1.1.1.1 next-hop-self
neighbor 5.5.5.5 remote-as 6500
neighbor 5.5.5.5 ebgp-multihop 4
neighbor 5.5.5.5 update-source Loopback4
no auto-summary
!
ip forward-protocol nd
ip route 5.5.5.5 255.255.255.255 10.1.45.2
ip route 5.5.5.5 255.255.255.255 10.1.46.2
!
!
************************************
R5 Config
!
interface Loopback0
ip address 200.1.0.1 255.255.255.0
!
interface Loopback1
ip address 200.1.1.1 255.255.255.0
!
interface Loopback2
ip address 200.1.2.1 255.255.255.0
!
interface Loopback3
ip address 200.1.3.1 255.255.255.0
!
interface Loopback4
ip address 200.1.4.1 255.255.255.0
!
interface Loopback5
ip address 5.5.5.5 255.255.255.255
!
interface Loopback6
ip address 200.1.6.1 255.255.255.0
!
interface Loopback7
ip address 200.1.7.1 255.255.255.0
!
interface Loopback10
ip address 50.1.1.1 255.255.255.0
!
interface Loopback11
ip address 200.1.5.1 255.255.255.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 10.1.46.2 255.255.255.248
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
ip address 10.1.45.2 255.255.255.248
clock rate 2000000
!
router bgp 6500
no synchronization
bgp log-neighbor-changes
network 50.1.1.0 mask 255.255.255.0
redistribute connected route-map AllowNetwork
neighbor 4.4.4.4 remote-as 5500
neighbor 4.4.4.4 ebgp-multihop 4
neighbor 4.4.4.4 update-source Loopback5
no auto-summary
!
ip forward-protocol nd
ip route 1.1.1.1 255.255.255.255 10.1.45.1
ip route 1.1.1.1 255.255.255.255 10.1.46.1
ip route 4.4.4.4 255.255.255.255 10.1.45.1
ip route 4.4.4.4 255.255.255.255 10.1.46.1
!
!
no ip http server
no ip http secure-server
!
ip access-list standard ISPNETWORK
permit 200.1.1.0
permit 200.1.3.0
permit 200.1.5.0
permit 200.1.7.0
deny any
!
!
!
!
route-map AllowNetwork permit 10
match ip address ISPNETWORK
!
!
!
!
control-plane
!
!
Solved! Go to Solution.
01-06-2013 04:05 AM
Hi
For R1 to Reach R5, it has to go via R2 or R4 and both of them doesn't have the route to R5 prefixes and they will drop the packets
Thanks
Raju
01-06-2013 04:41 AM
yes. or you should run BGP on all the 4 routers.
Look at below link which mentiones that "
You can also disable synchronization if all routers in your AS run BGP"
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800c95bb.shtml#synch
Thanks
Raju
01-06-2013 04:05 AM
Hi
For R1 to Reach R5, it has to go via R2 or R4 and both of them doesn't have the route to R5 prefixes and they will drop the packets
Thanks
Raju
01-06-2013 04:14 AM
So I must advertise all R5 loopback interfaces on R2 and R3 with the OSPF routing protocol, for R1 to be able to reach the loopbacks on R5?
01-06-2013 04:41 AM
yes. or you should run BGP on all the 4 routers.
Look at below link which mentiones that "
You can also disable synchronization if all routers in your AS run BGP"
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800c95bb.shtml#synch
Thanks
Raju
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