Here's a related good article:
"Excessive BGP AS-PATH prepending is a self-inflicted vulnerability"
https://blog.apnic.net/2019/07/15/excessive-bgp-as-path-prepending-is-a-self-inflicted-vulnerability/
You probably should not use a limit greater than 50 unless you want to
encourage this behavi
Yeah,I meant RIB, not FIB. Should have finished coffee first. :)
On Fri, Aug 26, 2022 at 9:10 PM Lincoln Dale wrote:
> If I was running an edge device with a limited FIB, perhaps I might drop
>> it to save memory. If I had beefier devices, perhaps I would just depref
>> it.
>>
>
> Note that if s
On Thu, Aug 25, 2022 at 10:58 AM Tom Beecher wrote:
> If I was running an edge device with a limited FIB, perhaps
>I might drop it to save memory. If I had beefier devices, perhaps
>I would just depref it.
Hi Tom,
Neither of these answers make much sense to me. If you're using a
default route to
>
> If I was running an edge device with a limited FIB, perhaps I might drop
> it to save memory. If I had beefier devices, perhaps I would just depref
> it.
>
Note that if said prefix either existed elsewhere with fewer prepends that
meant it 'won' bgp best-path selection, then it would not resul
https://datatracker.ietf.org/doc/html/draft-ietf-grow-as-path-prepending
Cheers,
Jeff
> On Aug 25, 2022, at 11:00, Tom Beecher wrote:
>
>
>
>> Usually What shoud we do ? Should we filter it ?
>
>
> As with many things, the answer depends on your situation.
>
> If I was running an edge de
> Usually What shoud we do ? Should we filter it ?
>
As with many things, the answer depends on your situation.
If I was running an edge device with a limited FIB, perhaps I might drop
it to save memory. If I had beefier devices, perhaps I would just depref
it. Maybe it's a prefix/source ASN I h
I would imagine the "long as-path" one would handle excessive prepends
too, right?
50 prepends is silly but doesn't really hurt my feelings. But >100 is absurd.
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Hello Alistair,
Are you sure there is one about excess prepends?. I just took a look
and I did not find any.
I found one about filtering long as-paths but not specifically about
prepends.
Thanks,
Alejandro,
On 25/8/22 10:31 AM, Alistair Mackenzie wrote:
There are some generally acc
On Thu, 25 Aug 2022, 16:31 Alistair Mackenzie, wrote:
> There are some generally accepted and useful filters found at
> https://bgpfilterguide.nlnog.net/. There is one which covers excess
> prepends.
>
It's generally accepted to filter **very** long as paths.
As Alistair pointed to. The guide
There are some generally accepted and useful filters found at
https://bgpfilterguide.nlnog.net/. There is one which covers excess
prepends.
On Thu, 25 Aug 2022 at 15:25, anonymous wrote:
> Hey everyone,
>
> Too many hops found as below.
> Usually What shoud we do ? Should we filter it ?
>
> 91.2
Hey everyone,
Too many hops found as below.
Usually What shoud we do ? Should we filter it ?
91.246.12.0/24
AS path: 4788 9002 41313 51196 51196 51196 51196
51196 51196 51196 51196 51196 51196 51196 51196 51196 51196 51196 51196
51196 51196 51196 51196 51196 51196 51196 51
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