RAdv: Documentation for more specific routes
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Michal 'vorner' Vaner
Ondrej Zajicek (work)
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@ -3336,7 +3336,8 @@ time intervals or as an answer to a request) advertisement packets to connected
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networks. These packets contain basic information about a local network (e.g. a
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list of network prefixes), which allows network hosts to autoconfigure network
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addresses and choose a default route. BIRD implements router behavior as defined
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in <rfc id="4861"> and also the DNS extensions from <rfc id="6106">.
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in <rfc id="4861">, router preferences and specific routes (<rfc id="4191">),
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and DNS extensions (<rfc id="6106">).
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<sect1>Configuration
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<label id="radv-config">
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@ -3373,7 +3374,7 @@ definitions, prefix definitions and DNS definitions:
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definitions may also be interface-specific when used inside interface
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options. By default, interface uses both global and interface-specific
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options, but that can be changed by <cf/rdnss local/ option.
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dsc-iface
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<tag><label id="radv-dnssl">dnssl { <m/options/ }</tag>
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DNSSL definitions allow to specify a list of advertised DNS search
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domains together with their options. Like <cf/rdnss/ above, multiple
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@ -3398,6 +3399,18 @@ dsc-iface
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default router. <cf/preferred lifetime/ and <cf/valid lifetime/ could
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also be configured as <cf/sensitive/ for a prefix, which would cause
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autoconfigured IPs to be deprecated or even removed.
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<tag><label id="radv-propagate-routes">propagate routes <m/switch/</tag>
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This option controls propagation of more specific routes, as defined in
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<rfc id="4191">. If enabled, all routes exported to the RAdv protocol,
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with the exception of the trigger prefix, are added to advertisments as
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additional options. The lifetime and preference of advertised routes can
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be set individually by <cf/ra_lifetime/ and <cf/ra_preference/ route
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attributes, or per interface by <cf/route lifetime/ and
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<cf/route preference/ options. Default: disabled.
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Note that the RFC discourages from sending more than 17 routes and
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recommends the routes to be configured manually.
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</descrip>
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<p>Interface specific options:
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@ -3444,21 +3457,45 @@ dsc-iface
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hosts. Valid values are 0-255, 0 means unspecified. Default: 64
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<tag><label id="radv-iface-default-lifetime">default lifetime <m/expr/ [sensitive <m/switch/]</tag>
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This option specifies the time (in seconds) how long (after the receipt
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This option specifies the time (in seconds) how long (since the receipt
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of RA) hosts may use the router as a default router. 0 means do not use
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as a default router. For <cf/sensitive/ option, see <ref id="radv-trigger" name="trigger">.
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Default: 3 * <cf/max ra interval/, <cf/sensitive/ yes.
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<tag><label id="radv-iface-linger-time">linger time <m/expr/</tag>
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When a prefix disappears, it is advertised for some time with 0
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lifetime, to inform clients the prefix is no longer usable. This option
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sets the time for how long it is advertised (in seconds). Maximum is
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3600, 0 means disabled. Default: 300.
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<tag><label id="radv-iface-default-preference-low">default preference low|medium|high</tag>
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<tag><label id="radv-iface-default-preference">default preference low|medium|high</tag>
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This option specifies the Default Router Preference value to advertise
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to hosts. Default: medium.
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<tag><label id="radv-iface-route-lifetime">route lifetime <m/expr/ [sensitive <m/switch/]</tag>
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This option specifies the default value of advertised lifetime for
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specific routes; i.e., the time (in seconds) for how long (since the
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receipt of RA) hosts should consider these routes valid. A special value
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0xffffffff represents infinity. The lifetime can be overriden on a per
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route basis by the <ref id="rta-ra-lifetime" name="ra_lifetime"> route
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attribute. Default: 3 * <cf/max ra interval/, <cf/sensitive/ no.
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For the <cf/sensitive/ option, see <ref id="radv-trigger" name="trigger">.
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If <cf/sensitive/ is enabled, even the routes with the <cf/ra_lifetime/
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attribute become sensitive to the trigger.
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<tag><label id="radv-iface-route-preference">route preference low|medium|high</tag>
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This option specifies the default value of advertised route preference
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for specific routes. The value can be overriden on a per route basis by
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the <ref id="rta-ra-preference" name="ra_preference"> route attribute.
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Default: medium.
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<tag><label id="radv-prefix-linger-time">prefix linger time <m/expr/</tag>
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When a prefix or a route disappears, it is advertised for some time with
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zero lifetime, to inform clients it is no longer valid. This option
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specifies the time (in seconds) for how long prefixes are advertised
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that way. Default: 3 * <cf/max ra interval/.
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<tag><label id="radv-route-linger-time">route linger time <m/expr/</tag>
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When a prefix or a route disappears, it is advertised for some time with
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zero lifetime, to inform clients it is no longer valid. This option
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specifies the time (in seconds) for how long routes are advertised
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that way. Default: 3 * <cf/max ra interval/.
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<tag><label id="radv-iface-rdnss-local">rdnss local <m/switch/</tag>
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Use only local (interface-specific) RDNSS definitions for this
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interface. Otherwise, both global and local definitions are used. Could
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@ -3505,7 +3542,6 @@ dsc-iface
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<cf/sensitive/ no.
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</descrip>
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<p>RDNSS specific options:
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<descrip>
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@ -3538,12 +3574,48 @@ dsc-iface
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RDNSS <cf/lifetime/ option above. Default: 3 * <cf/max ra interval/.
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</descrip>
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<sect1>Attributes
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<label id="radv-attr">
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<p>RAdv defines two route attributes:
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<descrip>
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<tag><label id="rta-ra-preference">enum ra_preference/</tag>
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The preference of the route. The value can be <it/RA_PREF_LOW/,
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<it/RA_PREF_MEDIUM/ or <it/RA_PREF_HIGH/. If the attribute is not set,
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the <ref id="radv-iface-route-preference" name="route preference">
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option is used.
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<tag><label id="rta-ra-lifetime">int ra_lifetime/</tag>
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The advertised lifetime of the route, in seconds. The special value of
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0xffffffff represents infinity. If the attribute is not set, the
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<ref id="radv-iface-route-lifetime" name="route lifetime">
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option is used.
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</descrip>
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<sect1>Example
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<label id="radv-exam">
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<p><code>
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table radv_routes; # Manually configured routes go here
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protocol static {
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table radv_routes;
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route 2001:0DB8:4000::/48 unreachable;
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route 2001:0DB8:4010::/48 unreachable;
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route 2001:0DB8:4020::/48 unreachable {
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ra_preference = RA_PREF_HIGH;
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ra_lifetime = 3600;
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};
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}
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protocol radv {
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propagate routes yes; # Propagate the routes from the radv_routes table
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table radv_routes;
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export all;
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interface "eth2" {
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max ra interval 5; # Fast failover with more routers
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managed yes; # Using DHCPv6 on eth2
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