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NE40 as Level1-2 Router in ISIS does not advertise default route to Level1 Router because Level1-2 router do not receive the routes of Level2 at outside

Publication Date:  2012-07-27 Views:  250 Downloads:  0
Issue Description

Topology: NE40--NE08
NE40 is a level1-2 router,  and NE08 is level1 one.   NE08 is required to generate one default route to NE40 automatically. However, the default route cannot be found on NE08 in the topology.

Alarm Information
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Handling Process
Level1-2 router needs to receive the routes of Level2 at outside, and then it could distribute a default route to level1 router.  
Root Cause

According to ISIS, level1-2 router is to adverise a default route to level1 router. However, level1 router does not generate a default route in the case, which is because that level1-2 router does not receive the level2 routing entries created by others,   so level1-2 router will not advertise a default route to level1 router. 

Suggestions
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