Solved

a question with BGP loopback neighbor establishement

Posted on 2011-09-14
6
1,276 Views
Last Modified: 2012-05-12
hello,

i have 2 routers on GNS3, i want to configure BGP based on the loopback of each router, but it never comes to Established status, it is stuck in "Active" here is my topology:


                               R1 =================
                                                                   //================== R2

Config:

R1:

R1#show run
Building configuration...

Current configuration : 1048 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
!
!
ip cef
no ip domain lookup
!
!
!
!        
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback1
 ip address 1.1.1.1 255.255.255.0
!        
interface Serial0/0
 ip address 192.168.12.1 255.255.255.0
 serial restart-delay 0
!
interface Serial0/1
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial0/2
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial0/3
 no ip address
 shutdown
 serial restart-delay 0
!
router bgp 1
 no synchronization
 bgp router-id 1.1.1.1
 bgp log-neighbor-changes
 network 192.168.12.0
 neighbor 2.2.2.2 remote-as 2
 neighbor 2.2.2.2 ebgp-multihop 2
 neighbor 2.2.2.2 update-source Loopback1
 no auto-summary
!
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
!
!
end

R1#

=================================================================


R2:

R2#show run
Building configuration...

Current configuration : 1048 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
!
!
ip cef
no ip domain lookup
!
!
!
!        
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback1
 ip address 2.2.2.2 255.255.255.0
!        
interface Serial0/0
 ip address 192.168.12.2 255.255.255.0
 serial restart-delay 0
!
interface Serial0/1
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial0/2
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial0/3
 no ip address
 shutdown
 serial restart-delay 0
!
router bgp 2
 no synchronization
 bgp router-id 2.2.2.2
 bgp log-neighbor-changes
 network 192.168.12.0
 neighbor 1.1.1.1 remote-as 1
 neighbor 1.1.1.1 ebgp-multihop 2
 neighbor 1.1.1.1 update-source Loopback1
 no auto-summary
!
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
!
!
end

R2#

0
Comment
Question by:zakar1a
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 3
6 Comments
 
LVL 25

Expert Comment

by:Ken Boone
ID: 36536915
The problem is that either router does not have a route to the other's BGP loopback address.  You have to be able to at least reach your BGP peer and right now you cannot.  Add a static route on each router to reach the other's BGP peer ip address and then it should come up.
0
 
LVL 7

Author Comment

by:zakar1a
ID: 36536940
i got this from debug:


*Mar  1 01:24:06.947: BGP: 2.2.2.2 active open failed - no route to peer, open active delayed 26593ms (35000ms max, 28% jitter)
0
 
LVL 25

Accepted Solution

by:
Ken Boone earned 500 total points
ID: 36536995
That is exactly what I mean:

On rtr 1 you need:
ip route 2.2.2.2 255.255.255.0 192.168.12.2

On rtr 2 you need:
ip route 1.1.1.1 255.255.255.0 192.168.12.1

Then each router will have a route to the other's loopback and then it will come up.
0
Are You Headed to Black Hat USA 2017?

Getting ready for Black Hat next week? Kick things off with the WatchGuard Badge Challenge and test your puzzle and cipher skills. Do you have what it takes to earn our limited edition Firebox Badge? Get started today - https://crimsonthorn.net

 
LVL 7

Author Comment

by:zakar1a
ID: 36537069
you meant :

ip route 2.2.2.2 255.255.255.255 192.168.12.2
ip route 1.1.1.1 255.255.255.255 192.168.12.1

right?
0
 
LVL 25

Expert Comment

by:Ken Boone
ID: 36537113
yea correct.
0
 
LVL 7

Author Closing Comment

by:zakar1a
ID: 36537140
thank you
0

Featured Post

Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

For months I had no idea how to 'discover' the IP address of the other end of a link (without asking someone who knows), and it drove me batty. Think about it. You can't use Cisco Discovery Protocol (CDP) because it's not implemented on the ASAs.…
During and after that shift to cloud, one area that still poses a struggle for many organizations is what to do with their department file shares.
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…
Suggested Courses
Course of the Month8 days, 5 hours left to enroll

617 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question