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| -rw-r--r-- | doc/bird.sgml | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/doc/bird.sgml b/doc/bird.sgml index 70cd523f..3f239f7d 100644 --- a/doc/bird.sgml +++ b/doc/bird.sgml @@ -512,14 +512,14 @@ incompatible with each other (that is to prevent you from shooting in the foot). Sets of prefixes are special: their literals does not allow ranges, but allows prefix patterns that are written as <cf><M>ipaddress</M>/<M>pxlen</M>{<M>low</M>,<M>high</M>}</cf>. - Prefix <cf><m>ip1</m>/<m>len1</m></cf> matches prefix pattern <cf><m>ip2</m>/<m>len2</m>{<m>l</m>, <m>h</m>}</cf> iff - the first <cf>min(len1, len2)</cf> bits of <cf/ip1/> and <cf/ip2/ are identical and <cf>len1 ≤ ip1 ≤ len2</cf>. - A valid prefix pattern has to satisfy <cf/low ≤ high/, but <cf/pxlen/ is not constrained by <cf/low/ + Prefix <cf><m>ip1</m>/<m>len1</m></cf> matches prefix pattern <cf><m>ip2</m>/<m>len2</m>{<m>l</m>,<m>h</m>}</cf> iff + the first <cf>min(len1, len2)</cf> bits of <cf/ip1/ and <cf/ip2/ are identical and <cf>len1 <= ip1 <= len2</cf>. + A valid prefix pattern has to satisfy <cf>low <= high</cf>, but <cf/pxlen/ is not constrained by <cf/low/ or <cf/high/. Obviously, a prefix matches a prefix set literal iff it matches any prefix pattern in the prefix set literal. There are also two shorthands for prefix patterns: <cf><m>address</m>/<m/len/+</cf> is a shorthand for - <cf><m>address</m>/<m/len/{<m/len/,<m/maxlen/}</cf> (where <cf><m>maxlen</m></c> is 32 for IPv4 and 128 for IPv6), + <cf><m>address</m>/<m/len/{<m/len/,<m/maxlen/}</cf> (where <cf><m>maxlen</m></cf> is 32 for IPv4 and 128 for IPv6), that means network prefix <cf><m>address</m>/<m/len/</cf> and all its subnets. <cf><m>address</m>/<m/len/-</cf> is a shorthand for <cf><m>address</m>/<m/len/{0,<m/len/}</cf>, that means network prefix <cf><m>address</m>/<m/len/</cf> and all its supernets (network prefixes that contain it). @@ -528,7 +528,7 @@ incompatible with each other (that is to prevent you from shooting in the foot). prefix <cf>1.0.0.0/8</cf>, all subprefixes of <cf>2.0.0.0/8</cf>, all superprefixes of <cf>3.0.0.0/8</cf> and prefixes <cf/4.X.X.X/ whose prefix length is 16 to 24. <cf>[ 0.0.0.0/0{20,24} ]</cf> matches all prefixes (regardless of IP address) whose prefix length is 20 to 24, <cf>[ 1.2.3.4/32- ]</cf> matches any prefix that contains IP address - <cf>1.2.3.4</cf>. <cf>1.2.0.0/16 ˜ [ 1.0.0.0/8{ 15 , 17 } ]</cf> is true, + <cf>1.2.3.4</cf>. <cf>1.2.0.0/16 ˜ [ 1.0.0.0/8{15,17} ]</cf> is true, but <cf>1.0.0.0/16 ˜ [ 1.0.0.0/8- ]</cf> is false. Cisco-style patterns like <cf>10.0.0.0/8 ge 16 le 24</cf> can be expressed |