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doc: Moved AS regular expressions to BGP regular expressions

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Regular expressions are used throughout in bgp commands, it
should not be in a section under as paths which cannot be
easily found.

Signed-off-by: Nigel Kukard <nkukard@lbsd.net>
This commit is contained in:
Nigel Kukard 2017-09-09 10:09:27 +00:00
parent b0e019cc0c
commit 47e7c0b971
1 changed files with 41 additions and 41 deletions
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82
doc/bgpd.texi
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@ -33,6 +33,7 @@ BGP-4.
* Capability Negotiation::
* Route Reflector::
* Route Server::
* BGP Regular Expressions::
* How to set up a 6-Bone connection::
* Dump BGP packets and table::
* BGP Configuration Examples::
@ -857,54 +858,21 @@ The AS numbers 64512 through 65535 are defined as private AS numbers.
Private AS numbers must not to be advertised in the global Internet.
@menu
* AS Path Regular Expression::
* Display BGP Routes by AS Path::
* AS Path Access List::
* Using AS Path in Route Map::
* Private AS Numbers::
@end menu
@node AS Path Regular Expression
@subsection AS Path Regular Expression
AS path regular expression can be used for displaying BGP routes and
AS path access list. AS path regular expression is based on
@code{POSIX 1003.2} regular expressions. Following description is
just a subset of @code{POSIX} regular expression. User can use full
@code{POSIX} regular expression. Adding to that special character '_'
is added for AS path regular expression.
@table @code
@item .
Matches any single character.
@item *
Matches 0 or more occurrences of pattern.
@item +
Matches 1 or more occurrences of pattern.
@item ?
Match 0 or 1 occurrences of pattern.
@item ^
Matches the beginning of the line.
@item $
Matches the end of the line.
@item _
Character @code{_} has special meanings in AS path regular expression.
It matches to space and comma , and AS set delimiter @{ and @} and AS
confederation delimiter @code{(} and @code{)}. And it also matches to
the beginning of the line and the end of the line. So @code{_} can be
used for AS value boundaries match. @code{show ip bgp regexp _7675_}
matches to all of BGP routes which as AS number include @var{7675}.
@end table
@node Display BGP Routes by AS Path
@subsection Display BGP Routes by AS Path
To show BGP routes which has specific AS path information @code{show
ip bgp} command can be used.
@deffn Command {show ip bgp regexp @var{line}} {}
This commands display BGP routes that matches AS path regular
expression @var{line}.
@deffn Command {show bgp @{ipv4|ipv6@} regexp @var{line}} {}
This commands displays BGP routes that matches a regular
expression @var{line} (@pxref{BGP Regular Expressions}).
@end deffn
@node AS Path Access List
@ -1021,8 +989,9 @@ empty it matches to any routes.
@deffn Command {ip community-list expanded @var{name} @{permit|deny@} @var{line}} {}
This command defines a new expanded community list. @var{line} is a
string expression of communities attribute. @var{line} can include
regular expression to match communities attribute in BGP updates.
string expression of communities attribute. @var{line} can be a
regular expression (@pxref{BGP Regular Expressions}) to match
the communities attribute in BGP updates.
@end deffn
@deffn Command {no ip community-list @var{name}} {}
@ -1335,8 +1304,8 @@ there is no matched entry, deny will be returned. When
@deffn Command {ip extcommunity-list expanded @var{name} @{permit|deny@} @var{line}} {}
This command defines a new expanded extcommunity-list. @var{line} is
a string expression of extended communities attribute. @var{line} can
include regular expression to match extended communities attribute in
BGP updates.
be a regular expression (@pxref{BGP Regular Expressions}) to match an
extended communities attribute in BGP updates.
@end deffn
@deffn Command {no ip extcommunity-list @var{name}} {}
@ -1504,7 +1473,8 @@ Total number of prefixes 1
@subsection More Show IP BGP
@deffn {Command} {show ip bgp regexp @var{line}} {}
This command display BGP routes using AS path regular expression (@pxref{Display BGP Routes by AS Path}).
This command displays BGP routes using AS path regular expression
(@pxref{BGP Regular Expressions}).
@end deffn
@deffn Command {show ip bgp community @var{community}} {}
@ -1821,6 +1791,36 @@ To display routing table of BGP view, you must specify view name.
Display routing table of BGP view @var{name}.
@end deffn
@node BGP Regular Expressions
@section BGP Regular Expressions
BGP regular expressions are based on @code{POSIX 1003.2} regular
expressions. The following description is just a quick subset of the
@code{POSIX} regular expressions. Adding to that, the special character
'_' is added.
@table @code
@item .
Matches any single character.
@item *
Matches 0 or more occurrences of pattern.
@item +
Matches 1 or more occurrences of pattern.
@item ?
Match 0 or 1 occurrences of pattern.
@item ^
Matches the beginning of the line.
@item $
Matches the end of the line.
@item _
Character @code{_} has special meanings in BGP regular expressions.
It matches to space and comma , and AS set delimiter @{ and @} and AS
confederation delimiter @code{(} and @code{)}. And it also matches to
the beginning of the line and the end of the line. So @code{_} can be
used for AS value boundaries match. This character technically evaluates
to @code{(^|[,@{@}() ]|$)}.
@end table
@node How to set up a 6-Bone connection
@section How to set up a 6-Bone connection