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Cisco Bug: CSCsg41019 - OSPF NSSA ABR send default-route LSA with fw-addr of router

Last Modified

May 15, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

3.2.3.ROUT

Description (partial)

None
Symptom:
A router running 3.2.3 acting as an OSPF ABR for an NSSA area, when announcing a default route into the NSSA area sets the LSA forwarding address to one of its interfaces instead of 0.0.0.0. In an instance where there is more than 1 interface from that router into the NSSA area (load balancing), only one interface will be used by NSSA routers to forward traffic towards. If there is no default-route present in the RIB, the forwarding address is set to 0.0.0.0 which will enable load-balancing.

Conditions:
This behaviour occurs when there is a default route present in the RIB of the ABR when advertising the default-route into the NSSA area.
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