Issue with BGP
Ok guys, tell me I am not crazy.
I have setup a simple BGP lab, yet for some reason the transit router will not route traffic. I have attached my topology and configs as well as a few show commands. I am wondering if this IOS is buggy or if GNS3 is just messing with me.
I am not able to ping 172.16.0.1, 172.16.0.2 or 172.16.1.1 from R1, nor am I able to ping 10.0.0.1, 10.0.0.2 or 10.1.1.1 from R3. I can ping from R2 to everything sucessfully, but when I attempt to ping 172.16.1.1 from R2's 10.0.0.2 interface, the ping fails.
R1
R2
R3
R1 "sh ip route"
R1 "sh ip bgp"
R2 "sh ip route"
R3 "sh ip route"
R3 "sh ip bgp"
I have setup a simple BGP lab, yet for some reason the transit router will not route traffic. I have attached my topology and configs as well as a few show commands. I am wondering if this IOS is buggy or if GNS3 is just messing with me.
I am not able to ping 172.16.0.1, 172.16.0.2 or 172.16.1.1 from R1, nor am I able to ping 10.0.0.1, 10.0.0.2 or 10.1.1.1 from R3. I can ping from R2 to everything sucessfully, but when I attempt to ping 172.16.1.1 from R2's 10.0.0.2 interface, the ping fails.
R1
! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname ISP1 ! boot-start-marker boot-end-marker ! ! memory-size iomem 5 no aaa new-model ip subnet-zero ip cef ! ! ! ! no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 10.1.1.1 255.255.255.0 ! interface FastEthernet0/0 no ip address shutdown duplex auto speed auto ! interface Serial0/0 bandwidth 128 ip address 10.0.0.1 255.255.255.252 clockrate 128000 ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! router bgp 200 no synchronization bgp log-neighbor-changes network 10.1.1.0 mask 255.255.255.0 neighbor 10.0.0.2 remote-as 100 no auto-summary ! ip classless ! ! no ip http server no ip http secure-server ! ! ! ! control-plane ! ! ! ! ! ! ! ! line con 0 exec-timeout 0 0 logging synchronous line aux 0 line vty 0 4 login ! ! end
R2
! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname ITA ! boot-start-marker boot-end-marker ! ! memory-size iomem 5 no aaa new-model ip subnet-zero ip cef ! ! ! ! no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 192.168.0.1 255.255.255.0 ! interface Loopback1 ip address 192.168.1.1 255.255.255.0 ! interface FastEthernet0/0 no ip address shutdown duplex auto speed auto ! interface Serial0/0 bandwidth 128 ip address 10.0.0.2 255.255.255.252 clockrate 128000 ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Serial0/1 bandwidth 128000 ip address 172.16.0.2 255.255.255.252 clockrate 128000 ! router bgp 100 no synchronization bgp log-neighbor-changes network 192.168.0.0 network 192.168.1.0 neighbor 10.0.0.1 remote-as 200 neighbor 172.16.0.1 remote-as 300 no auto-summary ! ip classless ! ! no ip http server no ip http secure-server ! ! ! ! control-plane ! ! ! ! ! ! ! ! line con 0 exec-timeout 0 0 logging synchronous line aux 0 line vty 0 4 login ! ! end
R3
! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname ISP2 ! boot-start-marker boot-end-marker ! ! memory-size iomem 5 no aaa new-model ip subnet-zero ip cef ! ! ! ! no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 172.16.1.1 255.255.255.0 ! interface FastEthernet0/0 no ip address shutdown duplex auto speed auto ! interface Serial0/0 bandwidth 128 ip address 172.16.0.1 255.255.255.252 clockrate 128000 ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! router bgp 300 no synchronization bgp log-neighbor-changes network 172.16.1.0 mask 255.255.255.0 neighbor 172.16.0.2 remote-as 100 no auto-summary ! ip classless ! ! no ip http server no ip http secure-server ! ! ! ! control-plane ! ! ! ! ! ! ! ! line con 0 exec-timeout 0 0 logging synchronous line aux 0 line vty 0 4 login ! ! end
R1 "sh ip route"
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 1 subnets
B 172.16.1.0 [20/0] via 10.0.0.2, 00:17:06
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.1.1.0/24 is directly connected, Loopback0
C 10.0.0.0/30 is directly connected, Serial0/0
B 192.168.0.0/24 [20/0] via 10.0.0.2, 00:17:06
B 192.168.1.0/24 [20/0] via 10.0.0.2, 00:17:06
R1 "sh ip bgp"
Network Next Hop Metric LocPrf Weight Path *> 10.1.1.0/24 0.0.0.0 0 32768 i *> 172.16.1.0/24 10.0.0.2 0 100 300 i *> 192.168.0.0 10.0.0.2 0 0 100 i *> 192.168.1.0 10.0.0.2 0 0 100 i
R2 "sh ip route"
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.0.0 is directly connected, Serial0/1
B 172.16.1.0 [20/0] via 172.16.0.1, 00:19:54
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
B 10.1.1.0/24 [20/0] via 10.0.0.1, 00:19:54
C 10.0.0.0/30 is directly connected, Serial0/0
C 192.168.0.0/24 is directly connected, Loopback0
C 192.168.1.0/24 is directly connected, Loopback1
R2 "sh ip bgp"Network Next Hop Metric LocPrf Weight Path *> 10.1.1.0/24 10.0.0.1 0 0 200 i *> 172.16.1.0/24 172.16.0.1 0 0 300 i *> 192.168.0.0 0.0.0.0 0 32768 i *> 192.168.1.0 0.0.0.0 0 32768 i
R3 "sh ip route"
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 172.16.0.0/30 is directly connected, Serial0/0
C 172.16.1.0/24 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 1 subnets
B 10.1.1.0 [20/0] via 172.16.0.2, 00:20:59
B 192.168.0.0/24 [20/0] via 172.16.0.2, 00:20:59
B 192.168.1.0/24 [20/0] via 172.16.0.2, 00:20:59
R3 "sh ip bgp"
*> 10.1.1.0/24 172.16.0.2 0 100 200 i *> 172.16.1.0/24 0.0.0.0 0 32768 i *> 192.168.0.0 172.16.0.2 0 0 100 i *> 192.168.1.0 172.16.0.2 0 0 100 i
Comments
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networker050184
Mod Posts: 11,962 Mod
The issue is the source of your pings. For example when R1 pings 172.16.0.1 its going to use a source of 10.0.0.1. R3 has no route back to this address and therefore drops the packet. Same thing with the other way. You can either advertise your blocks for your links, source the ping from one of the loopbacks or have a default to R2 to get it to succeed.An expert is a man who has made all the mistakes which can be made. -
Monkerz
Member Posts: 842
networker050184 wrote: »The issue is the source of your pings. For example when R1 pings 172.16.0.1 its going to use a source of 10.0.0.1. R3 has no route back to this address and therefore drops the packet. Same thing with the other way. You can either advertise your blocks for your links, source the ping from one of the loopbacks or have a default to R2 to get it to succeed.
Yeah, I didn't expect the WAN interfaces to be pingable, but I thought the loopback interfaces on R1 and R3 would be. -
networker050184
Mod Posts: 11,962 Mod
Well they will be pingable if you use a source address that the router has a route for, routing is a two way operation. Remember when you ping without specifying a source the router uses the outgoing interface address by default. Try "ping 172.16.0.1 source 10.1.1.1" or you might have to use the extended commands depending on your IOS.An expert is a man who has made all the mistakes which can be made.
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Monkerz
Member Posts: 842
networker050184 wrote: »Well they will be pingable if you use a source address that the router has a route for, routing is a two way operation. Remember when you ping without specifying a source the router uses the outgoing interface address by default. Try "ping 172.16.0.1 source 10.1.1.1" or you might have to use the extended commands depending on your IOS.
Pinging from loopback to loopback is working. I need to keep studying
Sending 5, 100-byte ICMP Echos to 172.16.0.1, timeout is 2 seconds: Packet sent with a source address of 10.1.1.1 ..... Success rate is 0 percent (0/5) Sending 5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds: Packet sent with a source address of 10.1.1.1 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 32/107/208 ms
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networker050184
Mod Posts: 11,962 Mod
You just have to remember the basics. People get caught up with protocols and this and that when it really comes down to fundamental routing and router operations.An expert is a man who has made all the mistakes which can be made.
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Monkerz
Member Posts: 842
This is actually a lab out of the Route Lab Manual. I print out the labs and do them myself without following their directions to ensure I can complete the task. I believe the lab is wrong, it wants you to advertise the loopbacks on all three routers, the use a tcl script to ping all loopback interfaces. It says they should all ping successfully.
After I had failed to get it to work, I followed the lab word for word and came out with the same exact issue. I guess they didn't test their lab.
Thanks for the help.
