BGP As-path not working as per expectation??

[Anand Solgama]

Hi,

My LAB has three AS 100 ,200,300 ...I want to permit only AS 200 to R3(AS 300),but when I checked R8,R7 which are belong to AS 100 are also able to see inside networks of AS 300.

Please help me in this.

I attached config and diagram with this message.

Thanks,

Anand Solgama

[Anand Solgama]

If u can suggest me command will be great help

Thanks,

[Harold Ritter]

Anand,

If I understand you correctly , you do not want AS200 to become a transit AS between AS100 and AS300, right? You have already applied filtering on R3 to ensure that AS300 will not use AS200 as a transit AS to AS100. You now have to apply the same filtering on R8 for the bgp session to R9 to ensure AS200 does not become a transit AS to AS300.

Another way to address that without changing R3 and R8 would be to configure R9 to only advertise the local routes (^$) to both R3 and R8. This would have the same effect.

Regards

[Anand Solgama]

My previous comment about last question I typed before see ur last post So now I get it These two ways

one ---Config on R8

second----Config local as advertise on R9 thanks

Freind Thanks a lot for your great help ,I sent you request in linkedin too pls accept it I checked about you that you have

14 years of experience and you have CCIE ( R and S,SP) OMG!!!!

So,I believe on you about answers

[Harold Ritter]

You are very welcome Anand. Thanks for the kind words

[Anand Solgama]

Yes I always do cle ip bg * command to clear to make sure connection come with new settings