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Cisco Bug: CSCuo90877 - 7.1.0.D1.0.85: type-7 LSA are entered as type-5 in RIB

Last Modified

Feb 08, 2017

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

7.1(0)ZN(0.99)

Description (partial)

Symptom:
N2 route is available in RIB instead of E2 route, while UUT[n7k-3] have a N2 route[100::100:1/128 as N2 from n7k-1 ] info and [100::100:1/128] as E2 from n7k-5 in n7k-3's Database with same metric

Conditions:
1.	The type-7 LSA for  100::100:1 has the forwarding address set, and hence, has ECMP reachability in the NSSA area from n7k-3.
2.	The type-5 LSA has no forwarding address, and the ASBR itself is reachable via ECMP from n7k-3.
3.	The type-7 and type-5 routes have different forwarding addresses, and hence are not comparable via Sec 2.5 6(e) of RFC3101 (That applies only if the same dest/cost/non-zero F.A). OSPF will therefore do ECMP with all the 4 next-hops.
4.	As per the design, NXOS OSPF and U6RIB store only one route-type per route, and unfortunately, this means that if there is a mix of route-types across next-hops, only one of them, (the new path type) will be shown for all next hops. In other words, route-type is currently a route property, and not a next-hop property.
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