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-rw-r--r--doc/bird.sgml58
1 files changed, 55 insertions, 3 deletions
diff --git a/doc/bird.sgml b/doc/bird.sgml
index 8a8c227..a00dbb7 100644
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -1602,11 +1602,22 @@ protocol ospf <name> {
tick <num>;
ecmp <switch> [limit <num>];
area <id> {
+ stub <switch>;
+ nssa <switch>;
+ summary <switch>;
stub cost <num>;
+ translator <switch>;
+ translator stability <num>;
+
networks {
<prefix>;
<prefix> hidden;
}
+ external {
+ <prefix>;
+ <prefix> hidden;
+ <prefix> tag <num>;
+ }
stubnet <prefix>;
stubnet <prefix> {
hidden <switch>;
@@ -1683,15 +1694,56 @@ protocol ospf <name> {
address, similarly to a router ID). The most important area is
the backbone (ID 0) to which every other area must be connected.
+ <tag>stub <M>switch</M></tag>
+ This option configures the area to be a stub area. External
+ routes are not flooded into stub areas. Also summary LSAs can be
+ limited in stub areas (see option <cf/summary/). Default
+ value is no. (Area is not stub.)
+
+ <tag>nssa <M>switch</M></tag>
+ This option configures the area to be a NSSA (Not-So-Stubby
+ Area). NSSA is a variant of a stub area which allows a
+ limited way of external route propagation. Global external
+ routes are not propagated into a NSSA, but an external route
+ can be imported into NSSA as a (area-wide) NSSA-LSA (and
+ possibly translated and/or aggregated on area boundary).
+ Default value is no. (Area is not NSSA.)
+
+ <tag>summary <M>switch</M></tag>
+ This option controls propagation of summary LSAs into stub or
+ NSSA areas. If enabled, summary LSAs are propagated as usual,
+ otherwise just the default summary route (0.0.0.0/0) is
+ propagated (this is sometimes called totally stubby area). If
+ a stub area has more area boundary routers, propagating
+ summary LSAs could lead to more efficient routing at the cost
+ of larger link state database. Default value is no.
+
<tag>stub cost <M>num</M></tag>
- No external (except default) routes are flooded into stub areas.
- Setting this value marks area stub with defined cost of default route.
- Default value is no. (Area is not stub.)
+ This option controls the cost of a default route propagated to
+ stub and NSSA areas. Default value is 1000.
+
+ <tag>translator <M>switch</M></tag>
+ This option controls translation of NSSA-LSAs into external
+ LSAs. By default, one translator per NSSA is automatically
+ elected from area boundary routers. If enabled, this area
+ boundary router would unconditionally translate all NSSA-LSAs
+ regardless of translator election. Default value is no.
+
+ <tag>translator stability <M>num</M></tag>
+ This option controls the translator stability interval (in
+ seconds). When the new translator is elected, the old one
+ keeps translating until the interval is over. Default value
+ is 40.
<tag>networks { <m/set/ }</tag>
Definition of area IP ranges. This is used in summary LSA origination.
Hidden networks are not propagated into other areas.
+ <tag>external { <m/set/ }</tag>
+ Definition of external area IP ranges for NSSAs. This is used
+ for NSSA-LSA translation. Hidden networks are not translated
+ into external LSAs. Networks can have configured route tag.
+
<tag>stubnet <m/prefix/ { <m/options/ }</tag>
Stub networks are networks that are not transit networks
between OSPF routers. They are also propagated through an