Virtual Private Routed Network Services
7210 SAS-X OS Services Guide Page 833
stub
Syntax [no] stub
Context config>service>vprn>ospf>area
Description This command enables access to the context to configure an OSPF stub area and adds/removes the
stub designation from the area. External routing information is not flooded into stub areas. All routers
in the stub area must be configured with the stub command. An OSPF area cannot be both an NSSA
and a stub area. Existing virtual links of a non STUB or NSSA area will be removed when its
designation is changed to NSSA or STUB.
By default, an area is not a stub area.
The no form of the command removes the stub designation and configuration context from the area.
Default no stub — The area is not configured as a stub area.
default-metric
Syntax default-metric metric
no default-metric
Context config>service>vprn>ospf>area>stub
Description This command configures the metric used by the area border router (ABR) for the default route into a
stub area. The default metric should only be configured on an ABR of a stub area. An ABR generates
a default route if the area is a stub area.
The no form of the command reverts to the default value.
Default default-metric 1
Parameters metric — The metric expressed as a decimal integer for the default route cost to be advertised into the
stub area.
Values 1 — 16777215
virtual-link
Syntax [no] virtual-link router-id transit-area area-id
Context config>service>vprn>ospf>area
Description This command configures a virtual link to connect area border routers to the backbone via a virtual
link. The backbone area (area 0.0.0.0) must be contiguous and all other areas must be connected to
the backbone area. If it is not practical to connect an area to the backbone (see area 0.0.0.2 in the
picture below) then the area border routers (routers 1 and 2 in the picture below) must be connected
via a virtual link. The two area border routers will form a point-to-point like adjacency across the
transit area (area 0.0.0.1 in the picture below). A virtual link can only be configured while in the area
0.0.0.0 context.
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