diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/bird.sgml | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/doc/bird.sgml b/doc/bird.sgml index 8d8ec35e..5027c3e4 100644 --- a/doc/bird.sgml +++ b/doc/bird.sgml @@ -572,7 +572,8 @@ incompatible with each other (that is to prevent you from shooting in the foot). to +2000000000. Overflows are not checked. You can use <cf/0x1234/ syntax to write hexadecimal values. <tag/pair/ This is a pair of two short integers. Each component can have values from 0 to - 65535. Literals of this type is written as <cf/(1234,5678)/. + 65535. Literals of this type are written as <cf/(1234,5678)/. The same syntax can also be + used to construct a pair from two arbitrary integer expressions (for example <cf/(1+2,a)/). <tag/string/ This is a string of characters. There are no ways to modify strings in filters. You can pass them between functions, assign them to variables of type <cf/string/, print @@ -640,6 +641,8 @@ incompatible with each other (that is to prevent you from shooting in the foot). 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. + BGP mask expressions can also contain integer expressions enclosed in parenthesis + and integer variables, for example <tt>[= * 4 (1+2) a =]</tt>. There is also old syntax that uses / .. / instead of [= .. =] and ? instead of *. <tag/clist/ Community list is similar to set of pairs, |