Solved

BGP Synchronization

Posted on 2009-07-16
8
420 Views
Last Modified: 2012-05-07
Suppose iBGP is not running on AS 65500 and synchronization is OFF. What will happen when Router B receive route to network 172.16.0.0. Which router in AS 65500 will also receive this network update ?

Thanks.

BGP-Synchronization.bmp
0
Comment
Question by:AXISHK
  • 4
  • 3
8 Comments
 
LVL 43

Expert Comment

by:JFrederick29
Comment Utility
No others than Router B will receive the route without running iBGP unless Router B is redistributing BGP into an IGP like OSPF or EIGRP which is running between all AS 65500 routers.
0
 
LVL 6

Assisted Solution

by:602650528
602650528 earned 100 total points
Comment Utility
If synchronisation is off, bgp must run on all routers in AS65500; that is the rule. And if you don't want to run BGP on all routers in AS65500, then you must redistribute, like JFrederick said, on routers B & E at the minimum.
0
 

Author Comment

by:AXISHK
Comment Utility
Thanks. But how about if all iBGP is running on each routers, but they are not fully meshed. ie. there is only physical connection between B - C - D - E. In this case, can each of them receive network 172.16.0.0 ??

Thanks again.
0
 
LVL 43

Accepted Solution

by:
JFrederick29 earned 400 total points
Comment Utility
In that case, only Router B and C would have the route without route reflection enabled.  With iBGP, you can peer across layer3 so all routers could fully mesh without being physically fully meshed in order for all routers in the AS to receive the route.
0
PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

 

Author Comment

by:AXISHK
Comment Utility
To clarify my understanding, do you mean that only Router B & C network receive 172.16.0.0 within AS 65500 through iBGP. Do I get the same result if synchronization is turn on / off ?

Thanks
0
 
LVL 43

Expert Comment

by:JFrederick29
Comment Utility
No, nothing to do with synchronization but rather split horizon.
0
 

Author Comment

by:AXISHK
Comment Utility
Thanks.

So, does it mean even though iBGP is running on B, C, D and E, only Router B could receive route to 172.16.0.0 as they are not physically full meshed ?

Thanks
0
 
LVL 43

Expert Comment

by:JFrederick29
Comment Utility
Yes, correct.  You can fully mesh logically however, i.e. Router C could peer with Router A through router B (physically).  There is no directly connected requirements in iBGP like there is in eBGP.
0

Featured Post

IT, Stop Being Called Into Every Meeting

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

Suggested Solutions

New Server 172.16.200.2  was moved from behind Router R2 f0/1 to behind router R1 int f/01 and has now address 172.16.100.2. But we want users still to be able to connected to it by old IP. How to do it ? We can used destination NAT (DNAT).  In DNAT…
Tired of waiting for your show or movie to load?  Are buffering issues a constant problem with your internet connection?  Check this article out to see if these simple adjustments are the solution for you.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

763 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

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now