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SIGNAMAX LLC • www.signamax.eu
C o n f i g u r e O S P F N S S A A r e a
NSSA (Not-So-Stubby Area) area is similar to the stub area, that is, do
not expand the type-5 LSA to NSSA area from the backbone, but can
bring in AS outer route in the area with limited form.
NSSA can bring in type-7 AS outer route in the NSSA area via re-
distribution, and then NSSA area edge router converts the type-7 outer
LSA to type-5 outer LSA and floods it to the whole AS area. The
converting process supports summarizing and filtering.
area nssa
This command is used to configure one area as NSSA area, which is also
called non-complete stub area. The no format of the command is used to
recover the area to common area.
area
area-id
nssa [default-information-originate [metric {
metric-
value
} | metric-type {
type-value
}] | no-redistribution | no-summary |
translate-always | translate-candidate | translate-never | translator-role
{always | candidate | never} ]
no area
area-id
nssa [default-information-originate | no-
redistribution | no-summary | translate-always | translate-candidate |
translate-never | translator-role {always | candidate | never} ]
Syntax
Description
area-id
The OSPF area ID
default-information-originate
Allow the NSSA area to generate the default route.
When the OSPF process is configured with the re-
distribution default route and if the NSSA area does
not configure the command, the default route
cannot be brought to the NSSA area.
metric
metric-value
Specify the metric value of NSSA default route.
metric
metric-type
Specify the metric-type pf the NSSA default route, 1
or 2
no-redistribution
Do not allow NSSA area to bring in outer route.
Although the OSPF process is configured with
redistribution outer route, do not allow binging in
outer route..
no-summary
Do not allow bringing in type-3 LSA from common
area. After configuring the command, ABR router of
NSSA generates one default route to be notified to
the NSSA area (in type-3 LSA mode). The routers in
the NSSA area reach the destination put of the area
via the default route.
translate-always
The area ABR of NSSA always converts type-7 LSA
to type-5 LSA.
translate-candidate
The election between NSSA ABR decides whether to
convert type-7 LSA to type-5 LSA.
translate-never
The area ABR of NSSA never converts type-7 LSA to
Содержание 065-7434
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