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.
You should not have any issues with a /22, most providers will accept /24 as the maximum length. refer to Regards Raymond chk 543 wrote:
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.
Best wishes,
Andy Davidson.
...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