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Cisco Bug: CSCuo28456 - N7K: ospf select wrong next-hop when redistribute route in NSSA area

Last Modified

Jan 28, 2017

Products (7)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases


Description (partial)

External routes in OSPF are installed over a NSSA area (instead of backbone area).

In case, there is reachability of OSPF external prefixes in both NSSA area and the backbone area, OSPF will install routes over those prefixes over the NSSA area.

Example topology:

area 0
(ABR)               (ABR/ASBR)
  |                     |
  |     area 1      |
  |      nssa        |
  |                     |

The problem only occurs if one of the links between the ABRs is in the backbone
area and another is in a NSSA area. Only releases 6.2.x/7.0.x are affected by this, and prior releases are unaffected.
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Bug Details Include

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