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Fixes in documentation.

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Ondrej Zajicek 2009-05-10 13:15:17 +02:00
parent 19e10907c1
commit e755986a34
1 changed files with 5 additions and 5 deletions
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doc/bird.sgml
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@ -513,13 +513,13 @@ 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 &le; ip1 &le; len2</cf>.
A valid prefix pattern has to satisfy <cf/low &le; high/, but <cf/pxlen/ is not constrained by <cf/low/
the first <cf>min(len1, len2)</cf> bits of <cf/ip1/ and <cf/ip2/ are identical and <cf>len1 &lt;= ip1 &lt;= len2</cf>.
A valid prefix pattern has to satisfy <cf>low &lt;= 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).