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:  145 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
Null
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
Null

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