29 Aug
2005
29 Aug
'05
9 p.m.
You can *not* merge AS_SET's, as the current BGP specs imply an AS_SET has a fixed path-length, hence you should NOT merge the sets in:
{1 2} [3 4] [5 6]
into:
{1 2} [3 4 5 6]
as the former path has a length of 3, the latter a length of just 2 - merging sets could change their meaning. Note though that you're not at all likely to see such paths with BGP speakers implementing the RFC / draft-ietf-idr-bgp-26.txt draft.
This is one thing that i have always been aware of but dont see it mentioned in the BGP draft which can be quite confusing to the newbies. Is it possible to explicitly mention this in draft-ietf-idr-bgp-26.txt? Toms.