The documentation update.

	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>;

	 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