Scenario:
As a junior networking engineer you were always fascinated with science fiction movies, that’s why you are now working at a company specialized in special effects. The closest you got to light speed was sending bits and bytes with electricity through wires…nevertheless there is a task waiting for you. You need to configure BGP between your network (AS100) and the service provider (AS100). Setting up BGP was no problem for you, but users behind router Luke are complaining they can’t access networks in AS 200. Time for you to solve this problem…you feel the force is strong within you so this should be a piece of cake!
Goal:
- All IP addresses have been preconfigured as specified in the topology picture.
- Configure IBGP between router Hansolo and Luke, use AS 100, use the loopback0 interfaces as source for BGP.
- Configure EBGP between router Hansolo and Leia.
- Ensure both BGP neighbor relationships are up.
- Router HanSolo: Advertise the 192.168.12.0/24 network into BGP.
- Router Leia: Advertise the 3.3.3.0 /24 network on the loopback0 interface into BGP.
- Router Leia: Advertise the 33.33.33.0 /24 network on the loopback1 into BGP.
- Ensure you can ping this network from router Hansolo.
- Ensure you can ping the loopback0 and loopback1 interface of router Leia from router Luke. You are not allowed to use static routes, don’t advertise network 192.168.13.0 /24 in BGP and you are also not allowed to use the BGP next-hop self command.
It took me 1000s of hours reading books and doing labs, making mistakes over and over again until I mastered all the routing protocols for CCNP.
Would you like to be a master of routing too? In a short time without having to read 900 page books or google the answers to your questions and browsing through forums?
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You will learn all the secrets about BGP, IBGP, EBGP, next-hops and more.
Does this sound interesting to you? Take a look here and let me show you how to Master CCNP ROUTE
IOS:
c3640-jk9s-mz.124-16.bin
Topology:
Video Solution:
Configuration Files
You need to register to download the GNS3 topology file. (Registration is free!)Once you are logged in you will find the configuration files right here.
The How to Master series helps you to understand complex topics like spanning-tree, VLANs, trunks, OSPF, EIGRP, BGP and more.
Written by René Molenaar - CCIE #41726
hmmm no next-hop-self command, no static route or network command for 192.168.13.0…hmmmmmmmmmmmm…wonder what to use then?
Hi,
We can use default-originate command for IBGP neighbor and advertise 192.168.12.0 in BGP.
Rgds,
sudheer
I’ll give you a little hint…*cough* route-map *cough* ;D
it gives u warning on router hansolo about next hop but still works.. i configured a route-map on hansolo to change nh to 1.1.1.1 and it worked perfectly fine
That’s the trick to this lab. Configure a route-map and set the next hop to the correct IP address. Same result as the "next-hop-self" command but different.
Hi Guys my brain is melting down on this one. I have route map in place that set up the next hope advertisments towards Luke to Hansolo. But still packet sent from Luke cant pass the HanSolo. here is the BGP and route map settings:
neighbor 2.2.2.2 route-map NEXT out
route-map NEXT permit 10
set ip next-hop 192.168.12.1
here is the route tapble on Luke
C 192.168.12.0/24 is directly connected, FastEthernet0/0
1.0.0.0/32 is subnetted, 1 subnets
S 1.1.1.1 [1/0] via 192.168.12.1
B 192.168.13.0/24 [200/0] via 192.168.12.1, 00:11:56
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
33.0.0.0/24 is subnetted, 1 subnets
B 33.33.33.0 [200/0] via 192.168.12.1, 00:12:02
3.0.0.0/24 is subnetted, 1 subnets
B 3.3.3.0 [200/0] via 192.168.12.1, 00:12:02
You did see my video solution? That should help.
Your next-hop for luke should be 23.2 not 12.1. Luke doesn’t know how to reach 192.168.12.0/24.
I’m assuming that was a mistype 🙂
The config and video show a network range of 192.168.13.x between hansolo and leia but the topology needs changing from 192.168.12.x in the diagram above.
excellent lab Rene!
Good lab; thanks, Rene!
Just for reference, I got the same warning you did when configuring the route-map in HanSolo, but it still worked.
Hello Rene, I have something to ask you or anyone else 🙂
Why route-map is applied on inbound direction? I really have trouble with route-map directions when they are used in BGP.
excellent lab
as previously stated, the network diagram does not match the startup config file.
i did this 2 ways:
1) route-map changing next hop on HanSolo outbound to Luke
2) route-map changing next hop on Luke inbound from HanSolo
Just fixed the network diagram…was about time 😉