Commit bde872bb authored by Ondřej Zajíček's avatar Ondřej Zajíček

The documentation update.

parent ed317862
......@@ -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> hidden;
external {
<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 ( 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
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