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Cisco Bug: CSCsy84853 - CRS-1 ospf area range pointing to null0

Last Modified

May 16, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases


Description (partial)


IOS-XR configured for OSPF ABR with area range prefer the Null0 entry 


Configuring under ospf: range x.x.x.x advertise
I have:

Routing entry for x.x.x.x/32                                        
Known via "ospf 1", distance 110, metric 0, type intra area
Installed Apr 1 00:40:11.898 for 00:20:12
Routing Descriptor Blocks
directly connected, via Null0               <---here is the problem, we leave the Null0 and so black holing traffic
Route metric is 0
y.y.y.y, from x.x.x.x, via TenGigE0/15/5/0.122  <--this is not chosen
Route metric is 5
No advertising protos.
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