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Beginner

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

1 ACCEPTED SOLUTION

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Advocate

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

View solution in original post

5 REPLIES 5
Highlighted
Advocate

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

View solution in original post

Highlighted
Beginner

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

Highlighted
Cisco Employee

Re: BGP Route Poisoning

Hi Milan,

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

Cheers

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
Highlighted
Advocate

Re: BGP Route Poisoning

Hi Harold,

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

Best regards,

Milan

Highlighted
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

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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