diff options
| author | Ondrej Zajicek <santiago@crfreenet.org> | 2009-04-17 01:48:36 +0200 |
|---|---|---|
| committer | Ondrej Zajicek <santiago@crfreenet.org> | 2009-04-17 01:48:36 +0200 |
| commit | c8a6b9a3d199444fd45879dd5cc5ececd9624822 (patch) | |
| tree | 1ada700f499ec771ea68873c87b51bc71b455a27 /doc/bird.sgml | |
| parent | 024c310b537abc3ddbac3054de71fd759d422824 (diff) | |
Rewrite of buggy AS path matching.
Old AS path maching supposes thath AS number appears
only once in AS path, but that is not true. It also
contains some bugs related to AS path sets.
New code does not use any assumptions about semantic
structure of AS path. It is asymptotically slower than
the old code, but on real paths it is not significant.
It also allows '?' for matching one arbitrary AS number.
Diffstat (limited to 'doc/bird.sgml')
| -rw-r--r-- | doc/bird.sgml | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/bird.sgml b/doc/bird.sgml index 1cb3fc4f..70d970f7 100644 --- a/doc/bird.sgml +++ b/doc/bird.sgml @@ -549,7 +549,8 @@ incompatible with each other (that is to prevent you from shooting in the foot). (using <cf>path ˜ [= 2 3 5 * =]</cf> syntax). The masks resemble wildcard patterns as used by UNIX shells. Autonomous system numbers match themselves, <cf/*/ matches any (even empty) - sequence of arbitrary AS numbers. For example, if <cf>bgp_path</cf> is 4 3 2 1, then: + sequence of arbitrary AS numbers and <cf/?/ matches one arbitrary AS number. + For example, if <cf>bgp_path</cf> is 4 3 2 1, then: <tt>bgp_path ˜ [= * 4 3 * =]</tt> is true, but <tt>bgp_path ˜ [= * 4 5 * =]</tt> is false. There is also old syntax that uses / .. / instead of [= .. =] and ? instead of *. |