Netgear Switch M4100-12G-POE+ User Manual download pdf (Page 308)

100

101

Routing Commands

308

ProSafe M4100 and M7100 Managed Switches

max-metric router-lsa

To configure OSPF to enter stub router mode, use this command in Router OSPF Global

Configuration mode. When OSPF is in stub router mode, as defined by RFC 3137, OSPF

sets the metric in the nonstub links in its router LSA to LsInfinity. Other routers therefore

compute long paths through the stub router, and prefer any alternate path. Doing so

eliminates all transit traffic through the stub router, when alternate routes are available. Stub

router mode is useful when adding or removing a router from a network or to avoid transient

routes when a router reloads. You can administratively force OSPF into stub router mode.

OSPF remains in stub router mode until you take OSPF out of stub router mode.

Alternatively, you can configure OSPF to start in stub router mode for a configurable period of

time after the router boots up.

If you set the summary LSA metric to 16,777,215, other routers skip the summary LSA when

they compute routes.

If you have configured the router to enter stub router mode on startup (max-metric

router-lsa on-startup) and enter max-metric router lsa, there is no change. If

OSPF is administratively in stub router mode (the max-metric router-lsa command has

been given), and you configure OSPF to enter stub router mode on startup (max-metric

router-lsa on-startup), OSPF exits stub router mode (assuming the startup period has

expired) and the configuration is updated.

Default

Format

max-metric router-lsa [on-startup seconds] [summary-lsa

{metric}]

Mode

no max-metric router-lsa

Use this command in OSPFv2 Router Configuration mode to disable stub router mode. The

command clears either type of stub router mode (always or on-startup) and resets the

summary-lsa option. If OSPF is configured to enter global configuration mode on startup,

and during normal operation you want to immediately place OSPF in stub router mode, issue

Format nsf [ietf] helper strict-lsa-checking

Modes OSPF Router Configuration

OSPF is not in stub router mode by default

OSPFv2 Router Configuration

Parameter Description

on-startup (Optional) OSPF starts in stub router mode after a reboot.

seconds (Required if on-startup) The number of seconds that OSPF remains in stub router

mode after a reboot. The range is 5–86,400 seconds. There is no default value.

summary-lsa (Optional) Set the metric in type 3 and type 4 summary LSAs to LsInfinity (0xFFFFFF).

metric (Optional) Metric to send in summary LSAs when in stub router mode. The range is

1–16,777,215. The default is 16,711,680 (0xFF0000).

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Netgear Switch M4100-12G-POE+ User Manual Page 308

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