BGP Route Poisoning

[kozorezdi]

Hello everybody,

I am trying to understand how BGP Route Poisoning works.

"Route poisoning

     - When a router selects a neighbor as the best next hop, it makes sure that the neighbor is not pointing

       back to the local router; it accomplishes this task by “poisoning” the router

       (marking the route unreachable) and sending a withdraw message to that neighbor. "

1) Router A:

Received both updates and select the best path for 200.200.200.0/24 via Router B

2) Route Poisoning:

Router A send a withdraw message about the prefix 200.200.200.0/24 to Router B.

Is it correct?

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Thank you in advance,

Dmitry

[milan.kulik · Accepted solution]

Hi Dmitry,

where does this BGP feature description come from?

I don't believe BGP works this way!

Possibly under some special conditions as discussed here 10 years ago:

https://supportforums.cisco.com/thread/8003

Best regards,

Milan

[kozorezdi]

Hi Milan,

It is from SPNGN part 2. The text behind 1) and 2) it was my attempt to explain the process. Thank you for the historical overview 2003

I checked it again, asked Harold and now it is more clear to me.  Thanks a lot!  Thank you for your help!!!

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Have a nice day,

Dmitry

[Harold Ritter]

Hi Milan,

Wow, 10 years ago. I feel old all of a sudden ;-)

Cheers

[milan.kulik]

Hi Harold,

as long as we are able to read a write meaningfully,  we are young guys! :-)

Best regards,

Milan

[Harold Ritter]

Hi Milan,

You are so right. I was just thinking that I have been contributing to this community for a long time. You have been for even longer. A lot of people on CSC have been around for a long time. I think this adds great value to CSC.

Regards