diff options
Diffstat (limited to 'doc/bird.sgml')
| -rw-r--r-- | doc/bird.sgml | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/doc/bird.sgml b/doc/bird.sgml index 7db9fad2..3cd80c32 100644 --- a/doc/bird.sgml +++ b/doc/bird.sgml @@ -1033,10 +1033,23 @@ incompatible with each other (that is to prevent you from shooting in the foot). <cf><m/P/.len</cf> returns the length of path <m/P/. - <cf>prepend(<m/P/,<m/A/)</cf> prepends ASN <m/A/ to path <m/P/ and returns the result. + <cf>prepend(<m/P/,<m/A/)</cf> prepends ASN <m/A/ to path + <m/P/ and returns the result. + + <cf>delete(<m/P/,<m/A/)</cf> deletes all instances of ASN + <m/A/ from from path <m/P/ and returns the result. + <m/A/ may also be an integer set, in that case the + operator deletes all ASNs from path <m/P/ that are also + members of set <m/A/. + + <cf>filter(<m/P/,<m/A/)</cf> deletes all ASNs from path + <m/P/ that are not members of integer set <m/A/. + I.e., <cf/filter/ do the same as <cf/delete/ with inverted + set <m/A/. + Statement <cf><m/P/ = prepend(<m/P/, <m/A/);</cf> can be shortened to <cf><m/P/.prepend(<m/A/);</cf> if <m/P/ is appropriate route attribute - (for example <cf/bgp_path/). + (for example <cf/bgp_path/). Similarly for <cf/delete/ and <cf/filter/. <tag/bgpmask/ BGP masks are patterns used for BGP path matching |