North American Network Operators Group|
Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical
Re: filtering long prefixes
Yes, Geert Jan, but if you look at the list I prepared, you'll note that the only chunks of old style Bs that are 18-bits long all come from one home-AS and most are in a pair of old-style class Bs which easily could be aggregated into a single /15 with the loss of some routing specificity (which is lost anyway when that provider's internal metrics don't propagate to its external peers). The remainder of the 'chunks' of old style Bs are all longer than 18 bits, and most are /24s or /26s, and I see none at all that appear difficult to aggregate, or which look like anything other than leaks due to misconfiguration. If you get to the point where someone needs to have a /18 in the old-style class B space and it can't be aggregated, we can return to this. Sean.