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@ -33,8 +33,8 @@ This document contains documentation for BIRD Internet Routing Daemon
<p><label id="intro"> You may wonder what 'bird' means. It is acronym of 'BIRD Internet Routing <p><label id="intro"> You may wonder what 'bird' means. It is acronym of 'BIRD Internet Routing
Daemon', and we think that's cool name. Its task is similar to what firmware of Cisco routers does, Daemon', and we think that's cool name. Its task is similar to what firmware of Cisco routers does,
or what gated (<HTMLURL URL="http://www.gated.org/">) or GNU zebra (<HTMLURL or what gated <HTMLURL URL="http://www.gated.org/"> or GNU zebra <HTMLURL
URL="http://www.zebra.org/">) does. However, you can not run Cisco's firmware on "normal" computer URL="http://www.zebra.org/"> does. However, you can not run Cisco's firmware on "normal" computer
and gated is really hard to configure and comes under wrong license. Bird is being developed on and gated is really hard to configure and comes under wrong license. Bird is being developed on
Charles University, Prague, and can be freely distributed under terms of GNU General Public Charles University, Prague, and can be freely distributed under terms of GNU General Public
License. Bird is designed to run on Unix and unix-like systems, it is primarily developed on Linux. License. Bird is designed to run on Unix and unix-like systems, it is primarily developed on Linux.
@ -47,7 +47,9 @@ it is slightly modified linuxdoc dtd. Anything in &lt;descrip&gt; tags is consi
configuration primitives, &lt;cf&gt; is fragment of configuration within normal text, &lt;m&gt; is configuration primitives, &lt;cf&gt; is fragment of configuration within normal text, &lt;m&gt; is
"meta" information -- something in config which is not keyword. "meta" information -- something in config which is not keyword.
<sect1>Configuration <sect>Configuration
<sect1>Introduction
<p>Bird is configured using text configuration file. At startup, bird reads <file/bird.conf/ <p>Bird is configured using text configuration file. At startup, bird reads <file/bird.conf/
(unless -c command line parameter is given). Really simple configuration file might look like this: (unless -c command line parameter is given). Really simple configuration file might look like this:
@ -75,7 +77,8 @@ ignored. If there's variable number of options, it is grouped using {
<p>You can find example of more complicated configuration file in <file>doc/bird.conf.example</file>. <p>You can find example of more complicated configuration file in <file>doc/bird.conf.example</file>.
<sect2>Global options <sect1>Global options
<p><descrip> <p><descrip>
<tag>log "<m/filename/"|syslog|stderr all|{ <m/list of <tag>log "<m/filename/"|syslog|stderr all|{ <m/list of
classes/ }</tag> set logging of classes (either all or <cf/{ classes/ }</tag> set logging of classes (either all or <cf/{
@ -104,11 +107,15 @@ ignored. If there's variable number of options, it is grouped using {
router. It is usually one of router's IP addresses. router. It is usually one of router's IP addresses.
<tag>table <m/name/</tag> create new routing table. <tag>table <m/name/</tag> create new routing table.
<tag>eval <m/expr/</tag> evaluates give filter expression. It is basically mainly for testing.
</descrip> </descrip>
<sect2>Per-protocol options <sect1>Per-protocol options
<p><descrip> <p>Several options are per-protocol, but all protocols support them. They are described here.
<descrip>
<tag>preference <m/expr/</tag> sets preference of this protocol. <tag>preference <m/expr/</tag> sets preference of this protocol.
<tag>disabled</tag> disables given protocol. <tag>disabled</tag> disables given protocol.
@ -122,6 +129,8 @@ ignored. If there's variable number of options, it is grouped using {
<tag>export <m/filter/</tag> This is similar to <cf>export</cf> keyword, except that it <tag>export <m/filter/</tag> This is similar to <cf>export</cf> keyword, except that it
works in direction from main routing table to protocol. works in direction from main routing table to protocol.
<tag>table <m/name/</tag> Connect this protocol to non-default table.
</descrip> </descrip>
<p>There are per-protocol options that give sense only with certain protocols. <p>There are per-protocol options that give sense only with certain protocols.
@ -234,7 +243,7 @@ booleans (that is to prevent you from shooting in the foot).
<sect1>Operations <sect1>Operations
<p>Filter language supports common integer operations <cf>(+,-,*,/)</cf>, parenthesis <cf/(a*(b+c))/, comparation <p>Filter language supports common integer operations <cf>(+,-,*,/)</cf>, parenthesis <cf/(a*(b+c))/, comparation
<cf/(a=b, a!=b, a&lt;b, a&gt;=b)/. Special operators include <cf/~/ for "in" operation. In operation can be <cf/(a=b, a!=b, a&lt;b, a&gt;=b)/. Special operators include <cf/&tilde;/ for "in" operation. In operation can be
used on element and set of that elements, or on ip and prefix, or on prefix and prefix. Its result used on element and set of that elements, or on ip and prefix, or on prefix and prefix. Its result
is true if element is in given set or if ip address is inside given prefix. is true if element is in given set or if ip address is inside given prefix.
@ -275,11 +284,23 @@ clause may be omitted.
<p><cf>case</cf> is similar to case from Pascal. Syntax is <cf>case <m/expr/ { else | <p><cf>case</cf> is similar to case from Pascal. Syntax is <cf>case <m/expr/ { else |
<m/num_or_prefix [ .. num_or_prefix]/ : <m/statement/ ; [ ... ] }</cf>. Expression after <m/num_or_prefix [ .. num_or_prefix]/ : <m/statement/ ; [ ... ] }</cf>. Expression after
<cf>case</cf> can be of any type that can be on the left side of ~ operator, and anything that could <cf>case</cf> can be of any type that can be on the left side of &tilde; operator, and anything that could
be member of set is allowed before :. Multiple commands are allowed without {} grouping. If argument be member of set is allowed before :. Multiple commands are allowed without {} grouping. If argument
matches neither of : clauses, else: clause is used. (Case is actually implemented as set matching, matches neither of : clauses, else: clause is used. (Case is actually implemented as set matching,
internally.) internally.)
<p>Here is example that uses if and case structures:
<code>
case arg1 {
2: print "two"; print "I can do more commands without {}";
3 .. 5: print "three to five";
else: print "something else";
}
if 1234 = i then printn "."; else { print "*** FAIL: if 1 else"; }
</code>
<sect>Protocols <sect>Protocols
<sect1>Rip <sect1>Rip
@ -321,7 +342,7 @@ interface but not listen on it.
<p>Following options generally override specified behavior from rfc. If you use any of these <p>Following options generally override specified behavior from rfc. If you use any of these
options, bird will no longer be rfc-compatible, which means it will not be able to talk to anything options, bird will no longer be rfc-compatible, which means it will not be able to talk to anything
other than equally (mis-)configured bird. I warned you. other than equally misconfigured bird. I warned you.
<descrip> <descrip>
<tag>port <M>number</M></tag> <tag>port <M>number</M></tag>