Standard prefix length filtering

Andy Davidson andy at
Wed Sep 19 08:03:35 UTC 2007

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.

Best wishes,
Andy Davidson.

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