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New Member

BGP Route Poisoning

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?

--

Thank you in advance,

Dmitry

  • WAN Routing and Switching
1 ACCEPTED SOLUTION

Accepted Solutions

BGP Route Poisoning

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

5 REPLIES

BGP Route Poisoning

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

New Member

Re: BGP Route Poisoning

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!!!

--

Have a nice day,

Dmitry

Cisco Employee

Re: BGP Route Poisoning

Hi Milan,

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

Cheers

Re: BGP Route Poisoning

Hi Harold,

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

Best regards,

Milan

Cisco Employee

Re: BGP Route Poisoning

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

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