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Cisco Bug: CSCvv53948 - LIG causes Map-Cache entry to override RIB

Last Modified

Oct 04, 2020

Products (14)

  • Cisco ASR 1000 Series Aggregation Services Routers
  • Cisco 4221 Integrated Services Router
  • Cisco ASR 1000 Series IOS XE SD-WAN
  • Cisco 4331 Integrated Services Router
  • Cisco 4321 Integrated Services Router
  • Cisco ASR 1002-X Router
  • Cisco ASR 1001-X Router
  • Cisco 4351 Integrated Services Router
  • Cisco ASR 1002-HX Router
  • Cisco ISR 4000 Series IOS XE SD-WAN
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Known Affected Releases

16.9.4

Description (partial)

Symptom:
Next hop behavior is inconsistent based on the order by which the route came in. 

RIB route exists -> RIB route is used
RIB route exists but field tech used LIG while troubleshooting -> Map Cache is used
RIB route exists but route is withdrawn and re-advertised causing the MS/MR to respond but retain a RIB route -> Map Cache is used.

In order to avoid this issue the customer believes the adjacency table should be based on the RIB first, not the Map Cache because the RIB preempts the Map Cache based on the existence of a RIB route.

Conditions:
Customer is using LISP with other dynamic routing protocols (specifically BGP/EIGRP) and routes are being learned or withdrawn. Other cases involve troubleshooting engineers preforming a LIG for a route leading to the next hop behavior incorrectly changing and causing outages for specific subnets.
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Bug Details Include

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