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Cisco Bug: CSCuj30572 - Router crash @ eigrp_pfr_get_drdb with PFR and OER

Last Modified

Apr 17, 2019

Products (9)

  • Cisco IOS
  • Cisco 7301 Router
  • Cisco 7206 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(4)M

Description (partial)

Symptom: With EIGRP and PFR configured, Router crashes after giving following EIGRP messages.
000111: Sep 17 09:08:33.331: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.50.2.1 (Tunnel502) is down: Peer Termination received
000112: Sep 17 09:08:33.347: %DUAL-3-INTERNAL: EIGRP-IPv4 1: Internal Error -Traceback= 319D4CB4z 319EC5E4z 319EC7C8z 319E4950z 319EA760z 31A25008z 32C23084z 32C23068z
Conditions:PFR, OER and EIGRP need to be configured.

Say RouterUnderTest has two EIGRP Peers HUB1 and HUB2. (Given metrics are only for illustration)
When EIGRP has a Prefix with 3 different Paths installed in following Order
DRDB1  NH - HUB1, Metric 36571392 / 0          (Installed by PFR)
DRDB2  NH - HUB2, Metric 58322432 / 409600     ( x Hops away learnt from RouterX)
DRDB3  NH - HUB1, Metric 538004992/500409600   (y Hops away learnt from Router Y)

With these initial conditions, if Neighbor ship with Router Y goes down, Both PFR and EIGRP try to delete DRDB3 Which results in inconsistent data structures with Memory corruption. Any further access to Memory will result in Crash.
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