Netgear Switch M4100-12G-POE+ User Manual download pdf (Page 268)

100

101

Routing Commands

268

ProSafe M4100 and M7100 Managed Switches

no area range

The no form of this command deletes a specified area range or reverts an option to its

default.

Format

no area areaid range prefix netmask {summarylink |

nssaexternallink} [advertise | not-advertise] [cost]

Mode

area stub (OSPF)

This command creates a stub area for the specified area ID. A stub area is characterized by

the fact that AS External LSAs are not propagated into the area. Removing AS External LSAs

and Summary LSAs can significantly reduce the link state database of routers within the stub

area.

Format area <areaid> stub

Mode

Parameter Description

area-id The area identifier for the area whose networks are to be summarized.

prefix netmask The summary prefix to be advertised when the ABR computes a route to one or more

networks within this prefix in this area.

summarylink When this keyword is given, the area range is used when summarizing prefixes advertised in

type 3 summary LSAs.

nssaexternallink When this keyword is given, the area range is used when translating type 7 LSAs to type 5

LSAs.

advertise [Optional] When this keyword is given, the summary prefix is advertised when the area range

is active. This is the default.

not-advertise [Optional] When this keyword is given, neither the summary prefix nor the contained prefixes

are advertised when the area range is active. When the not-advertise option is given, any

static cost previously configured is removed from the system configuration.

cost [Optional] If an optional cost is given, OSPF sets the metric field in the summary LSA to the

configured value rather than setting the metric to the largest cost among the networks

covered by the area range. A static cost might only be configured if the area range is

configured to advertise the summary. The range is 0–16,777,215. If the cost is set to

16,777,215 for type 3 summarization, a type 3 summary LSA is not advertised, but contained

networks are suppressed. This behavior is equivalent to specifying the not-advertise option. If

the range is configured for type 7 to type 5 translation, a type 5 LSA is sent if the metric is set

to 16,777,215; however, other routers will not compute a route from a type 5 LSA with this

metric.

OSPFv2 Router Configuration

Router OSPF Config

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