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-rw-r--r--doc/bird.sgml6
1 files changed, 4 insertions, 2 deletions
diff --git a/doc/bird.sgml b/doc/bird.sgml
index b35f494..31b2c03 100644
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -266,8 +266,10 @@ protocol rip {
about configuring protocols in their own chapters. You can run more than one instance of
most protocols (like RIP or BGP). By default, no instances are configured.
- <tag>define <m/constant/ = (<m/expression/)|<m/number/|<m/IP address/</tag> Define a constant. You can use it later in every place
- you could use a simple integer or an IP address.
+ <tag>define <m/constant/ = (<m/expression/)|<m/number/|<m/IP address/</tag>
+ Define a constant. You can use it later in every place you could use a simple integer or an IP address.
+ Besides, there are some predefined numeric constants based on /etc/iproute2/rt_* files.
+ A list of defined constants can be seen (together with other symbols) using 'show symbols' command.
<tag>router id <m/IPv4 address/</tag> Set BIRD's router ID. It's a world-wide unique identification of your router, usually one of router's IPv4 addresses. Default: in IPv4 version, the lowest IP address of a non-loopback interface. In IPv6 version, this option is mandatory.