Juniper IGP - CONFIGURATION GUIDE V11.1.X, Руководство по настройке

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Use to prevent level 1 routers from automatically installing a default route to a
level 1-2 router in order to reach destinations outside the area.
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Suppresses the level 1-2 router from indicating to level 1 routers that it can reach
other areas. Consequently, the level 1 routers do not consider the level 1-2 router
to be the nearest attached level 2 router and do not install default routes to it.
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This command is useful, for example, if you issue the distribute-domain-wide
command, which causes the level 2 routes to be leaked into the level 1 area. The
level 1 routers then have knowledge of the routes outside the area and will not
need to rely on the nearest attached level 2 router for any unknown destination.
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Example
host1(config-router)# suppress-default
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Use the no version to disable suppression of default routes.
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See suppress-default
Setting Router Type
You can specify whether the router behaves as an IS-IS station router, area router,
or both.
is-type
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Use to configure the router to act as either a station router (level 1), an area
router (level 2), or as both a station router and an area router (level-1-2).
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Always configure the type of IS-IS router.
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Level-1-2 is the default.
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Example
host1(config-router)# is-type level-2-only
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Use the no version to restore the default value, level-1-2.
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See is-type
Summarizing Routes
You can summarize routes redistributed into IS-IS or within IS-IS by creating aggregate
addresses for the routes. Use the
summary-address command for IP routes and the
summary-prefix command for IPv6 routes.
Optionally, you can set a route tag for an IS-IS aggregate (summary) address by
including the
tag keyword and a numeric tag value in the command.
summary-address
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See summary-address
summary-prefix
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Configuring Global IS-IS Parameters
JUNOSe 11.0.x IP, IPv6, and IGP Configuration Guide