Doc: SADR documentation
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Ondrej Zajicek (work)
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1 changed files with 46 additions and 15 deletions
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@ -293,6 +293,20 @@ routes are:
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<item>Route next hops (see below)
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</itemize>
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<sect1>IPv6 source-specific routes
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<label id="ip-sadr-routes">
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<p>The IPv6 routes containing both destination and source prefix. They are used
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for source-specific routing (SSR), also called source-address dependent routing
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(SADR), see <rfc id="8043">. Currently limited mostly to the Babel protocol.
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Configuration keyword is <cf/ipv6 sadr/.
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<itemize>
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<item>(PK) Route destination (IP prefix together with its length)
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<item>(PK) Route source (IP prefix together with its length)
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<item>Route next hops (see below)
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</itemize>
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<sect1>VPN IPv4 and IPv6 routes
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<label id="vpn-routes">
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@ -1239,6 +1253,12 @@ foot).
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pair, and <cf/.len/, which separates prefix length from the pair.
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So <cf>1.2.0.0/16.len = 16</cf> is true.
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<cf/NET_IP6_SADR/ nettype holds both destination and source IPv6
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prefix. The literals are written as <cf><m/ipaddress//<m/pxlen/ from
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<m/ipaddress//<m/pxlen/</cf>, where the first part is the destination
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prefix and the second art is the source prefix. They support the same
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operators as IP prefixes, but just for the destination part.
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<cf/NET_VPN4/ and <cf/NET_VPN6/ prefixes hold an IP prefix with VPN
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Route Distinguisher (<rfc id="4364">). They support the same special
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operators as IP prefixes, and also <cf/.rd/ which extracts the Route
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@ -1459,6 +1479,7 @@ foot).
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lclists, with LCs instead of pairs as arguments.
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</descrip>
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<sect>Operators
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<label id="operators">
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@ -1651,19 +1672,25 @@ cases desirable.
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routes over the same IPv6 transport. For sending and receiving Babel packets,
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only a link-local IPv6 address is needed.
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<p>BIRD does not implement any Babel extensions, but will coexist with
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implementations using extensions (and will just ignore extension messages).
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<p>BIRD implements an extension for IPv6 source-specific routing (SSR or SADR),
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but must be configured accordingly to use it. SADR-enabled Babel router can
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interoperate with non-SADR Babel router, but the later would ignore routes
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with specific (non-zero) source prefix.
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<sect1>Configuration
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<label id="babel-config">
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<p>Babel supports no global configuration options apart from those common to all
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other protocols, but supports the following per-interface configuration options:
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<p>The Babel protocol support both IPv4 and IPv6 channels; both can be
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configured simultaneously. It can also be configured with <ref
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id="ip-sadr-routes" name="IPv6 SADR"> channel instead of regular IPv6
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channel, in such case SADR support is enabled. Babel supports no global
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configuration options apart from those common to all other protocols, but
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supports the following per-interface configuration options:
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<code>
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protocol babel [<name>] {
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ipv4 { <channel config> };
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ipv6 { <channel config> };
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ipv6 [sadr] { <channel config> };
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interface <interface pattern> {
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type <wired|wireless>;
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rxcost <number>;
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@ -1683,8 +1710,8 @@ protocol babel [<name>] {
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</code>
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<descrip>
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<tag><label id="babel-channel">ipv4|ipv6 <m/channel config/</tag>
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The supported channels are IPv4 and IPv6.
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<tag><label id="babel-channel">ipv4 | ipv6 [sadr] <m/channel config/</tag>
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The supported channels are IPv4, IPv6, and IPv6 SADR.
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<tag><label id="babel-type">type wired|wireless </tag>
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This option specifies the interface type: Wired or wireless. On wired
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@ -2124,7 +2151,7 @@ using the following configuration parameters:
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but in such cases you need to tweak the BGP paths manually in the filters
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to get consistent behavior.) Optional <cf/ip/ argument specifies a source
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address, equivalent to the <cf/source address/ option (see below).
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Optional </cf/port> argument specifies the local BGP port instead of
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Optional <cf/port/ argument specifies the local BGP port instead of
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standard port 179. The parameter may be used multiple times with
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different sub-options (e.g., both <cf/local 10.0.0.1 as 65000;/ and
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<cf/local 10.0.0.1; local as 65000;/ are valid). This parameter is
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@ -2745,16 +2772,17 @@ protocol device {
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<p>The Direct protocol is a simple generator of device routes for all the
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directly connected networks according to the list of interfaces provided by the
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kernel via the Device protocol. The Direct protocol supports both IPv4 and IPv6
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channels.
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channels; both can be configured simultaneously. It can also be configured with
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<ref id="ip-sadr-routes" name="IPv6 SADR"> channel instead of regular IPv6
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channel in order to be used together with SADR-enabled Babel protocol.
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<p>The question is whether it is a good idea to have such device routes in BIRD
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routing table. OS kernel usually handles device routes for directly connected
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networks by itself so we don't need (and don't want) to export these routes to
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the kernel protocol. OSPF protocol creates device routes for its interfaces
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itself and BGP protocol is usually used for exporting aggregate routes. Although
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there are some use cases that use the direct protocol (like abusing eBGP as an
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IGP routing protocol), in most cases it is not needed to have these device
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routes in BIRD routing table and to use the direct protocol.
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itself and BGP protocol is usually used for exporting aggregate routes. But the
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Direct protocol is necessary for distance-vector protocols like RIP or Babel to
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announce local networks.
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<p>There is one notable case when you definitely want to use the direct protocol
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-- running BIRD on BSD systems. Having high priority device routes for directly
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@ -2829,8 +2857,10 @@ kernel protocols to the same routing table and changing route destination
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(gateway) in an export filter of a kernel protocol does not work. Both
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limitations can be overcome using another routing table and the pipe protocol.
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<p>The Kernel protocol supports both IPv4 and IPv6 channels; only one of them
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can be configured in each protocol instance.
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<p>The Kernel protocol supports both IPv4 and IPv6 channels; only one channel
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can be configured in each protocol instance. On Linux, it also supports <ref
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id="ip-sadr-routes" name="IPv6 SADR"> and <ref id="mpls-routes" name="MPLS">
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channels.
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<sect1>Configuration
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<label id="krt-config">
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@ -4281,6 +4311,7 @@ protocol rip {
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<sect>RPKI
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<label id="rpki">
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<sect1>Introduction
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