02-25-2022
10:39 AM
- last edited on
02-25-2022
10:05 PM
by
Translator
Hi All,
I have configured BGP on R1,R2 & R3.
R1 & R2 : IBGP : (ASN: 65100)
R3 - ASN: 64519
R2 advertised 192.169.1.0/24 network.
R1 & R3 received that route.
If i shutdown the direct link from R1 to R2(Interface (G 0/1), R1 is not able to learn route 192.168.1.0/24 through R3.
Can someone explain, why ?
Routes learned:(When interface is UP)
Route not learned(when interface is shutdown)
Solved! Go to Solution.
02-25-2022 10:54 AM - edited 02-25-2022 11:15 AM
Hi @Cisconew ,
The route is rejected by R1, because its own AS number (65100) is contained in the update AS PATH. The AS PATH loop prevention mechanism will not allow that.
Regards,
02-25-2022 10:48 AM
Hello,
what is 192.168.1.0, an (loopback) interface, a static (null) route ?
02-25-2022
10:58 AM
- last edited on
02-25-2022
10:07 PM
by
Translator
It's a
loopback interface ip address>
02-25-2022 10:54 AM - edited 02-25-2022 11:15 AM
Hi @Cisconew ,
The route is rejected by R1, because its own AS number (65100) is contained in the update AS PATH. The AS PATH loop prevention mechanism will not allow that.
Regards,
02-25-2022 10:58 AM
Thank you: I understand AS_Path loop prevention Mechanism.
03-05-2022 11:27 PM
AS PATH loop defense mechanism
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