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Cisco Bug: CSCtb94723 - 31SB16:RR sending illegal pfx in withdraw to old style MDT PE

Last Modified

Jan 28, 2017

Products (6)

  • Cisco IOS
  • Cisco 7206 Router
  • Cisco 7206VXR Router
  • Cisco 7204 Router
  • Cisco 7202 Router
  • Cisco 7204VXR Router

Known Affected Releases


Description (partial)


   RR BGP flapping with some PE when received "illegal network" from peer. This
issue only happen on 12.2(31)SB16. This issue is caused by MDT mismatch between
RR and PE (some PE didn't configure BGP MDT). If we downgrade ios to SB14, or
remove MDT neighbor between RR1 and PE2 on RR1, this scenario will disappear.


just happened on 31sb16, we have never seen it on 31SB14
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