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Cisco Bug: CSCuq93504 - Static route for connected IP installed in RIB as Local due to NAT alias

Last Modified

Nov 27, 2020

Products (9)

  • Cisco 2600 Series Multiservice Platforms
  • Cisco 7206 Router
  • Cisco 7301 Router
  • Cisco 7206VXR Router
  • Cisco 7204 Router
  • Cisco 7202 Router
  • Cisco 7200 Series NPE-G2 Network Processing Engine
  • Cisco 7204VXR Router
  • Cisco 7201 Router

Known Affected Releases

15.2(1)T 15.2(4)M

Description (partial)

Symptom:
If a static route is configured for a connected ip using the outgoing interface, the route is installed as STATIC in the routing table.

However, if we also have a NAT overload statement for that ip, it creates an alias entry for that ip address as soon the NAT entry is used and thus, the STATIC route in RIB converts to LOCAL and thus, is not advertised via any dynamic routing protocol.

Conditions:
1. Static route for a connected ip.
2. NAT overload statement for the same ip.
3. The issue is observed in all 15.2 (M and T) and higher IOS releases. Not observed on 15.1 IOS releases.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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