Commit 300bd0eb authored by Ondřej Zajíček's avatar Ondřej Zajíček

Babel: Add documentation for dual-stack operation and options

This updates the documentation for the Babel protocol to mention the fact
that it now supports dual-stack operation, and adds documentation for the
new next hop options.

Thanks to Toke Høiland-Jørgensen <toke@toke.dk> for the patch.
parent 4324025f
......@@ -1596,13 +1596,12 @@ networks. Babel is conceptually very simple in its operation and "just works"
in its default configuration, though some configuration is possible and in some
cases desirable.
<p>While the Babel protocol is dual stack (i.e., can carry both IPv4 and IPv6
routes over the same IPv6 transport), BIRD presently implements only the IPv6
subset of the protocol. No Babel extensions are implemented, but the BIRD
implementation can coexist with implementations using the extensions (and will
just ignore extension messages).
<p>The Babel protocol is dual stack; i.e., it can carry both IPv4 and IPv6
routes over the same IPv6 transport. For sending and receiving Babel packets,
only a link-local IPv6 address is needed.
<p>The Babel protocol implementation in BIRD is currently in alpha stage.
<p>BIRD does not implement any Babel extensions, but will coexist with
implementations using extensions (and will just ignore extension messages).
<sect1>Configuration
<label id="babel-config">
......@@ -1623,6 +1622,8 @@ protocol babel [<name>] {
rx buffer <number>;
tx length <number>;
check link <switch>;
next hop ipv4 <address>;
next hop ipv6 <address>;
};
}
</code>
......@@ -1680,6 +1681,18 @@ protocol babel [<name>] {
routes received from them are withdrawn. It is possible that some
hardware drivers or platforms do not implement this feature. Default:
yes.
<tag><label id="babel-next-hop-ipv4">next hop ipv4 <m/address/</tag>
Set the next hop address advertised for IPv4 routes advertised on this
interface. If not set, the first IPv4 address found on the interface will
be used, so it should only be necessary to set this option if this
auto-detection fails or finds the wrong address.
<tag><label id="babel-next-hop-ipv6">next hop ipv6 <m/address/</tag>
Set the next hop address advertised for IPv6 routes advertised on this
interface. If not set, the same link-local address that is used as the
source for Babel packets will be used. In normal operation, it should not
be necessary to set this option.
</descrip>
<sect1>Attributes
......@@ -1708,7 +1721,12 @@ protocol babel {
# configured on local interfaces, plus re-distribute all routes received
# from other babel peers.
export where (source = RTS_DEVICE) || (source = RTS_BABEL);
ipv4 {
export where (source = RTS_DEVICE) || (source = RTS_BABEL);
};
ipv6 {
export where (source = RTS_DEVICE) || (source = RTS_BABEL);
};
}
</code>
......
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