nanog mailing list archives
Re: Standard prefix length filtering
From: Joe Provo <nanog-post () rsuc gweep net>
Date: Wed, 19 Sep 2007 10:45:07 -0400
On Wed, Sep 19, 2007 at 09:03:35AM +0100, Andy Davidson wrote:
On 19 Sep 2007, at 06:22, chk 543 wrote:Is there a standard prefix length most providers filter on, or is there a way to find out what each provider filters on? We have been assigned a /22 and are wondering if we will have any issues with this block.There are no hard and fast rules, but a general rule is the more you de-aggregate the more problems you are going to have, so unless you have a very good reason not to, announce the /22 and nothing longer.
...and if you think you have "a reason" to do so, carefully consider if the shorter prefix needs to be visibly globally or not. If you still are intent on deaggregating on a global scale and wish to guarantee no problems, send the deaggregates in addition to the aggregate such that you will still be visible to more-specific filters. Cheers, Joe -- RSUC / GweepNet / Spunk / FnB / Usenix / SAGE
Current thread:
- Standard prefix length filtering chk 543 (Sep 18)
- Re: Standard prefix length filtering Raymond Macharia (Sep 18)
- Re: Standard prefix length filtering Andy Davidson (Sep 19)
- Re: Standard prefix length filtering Joe Provo (Sep 19)