IPv6 BGP prefix filters

Mailman List Mirror (Read Only)
1

Hi,

So recently I've come across an issue with a large ISP announcing a /22 and
/25 of IPv6 space. We are currently filtering <28 and >48 which until now
has worked fine for us.

What are others using as their prefix filters in the DFZ?

Thanks,
Alistair

2

The NTT global backbone (AS 2914) generally accepts (barring the other
filters) IPv6 prefixes within "2000::/3 ge 12 le 48" over eBGP. Longer
prefixes are only accepted on customer sessions, when a valid IRR route6
object exists.

Kind regards,

Job

3

Hi,

So recently I've come across an issue with a large ISP announcing a /22 and
/25 of IPv6 space. We are currently filtering <28 and >48 which until now
has worked fine for us.

What are others using as their prefix filters in the DFZ?

Currently the shortest prefix delegation to an RIR is a /12, the
assigned global uni-cast range at present all fits within 2000::/3.

I currently apply < 20, > /48 but I also have recourse to default.