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Cisco Bug: CSCuq56969 - uBR10k PRE5 Gig 0/0/0 Uses Duplex Auto Negotiate After PRESO

Last Modified

Sep 14, 2019

Products (1)

  • Cisco uBR10000 Series Universal Broadband Routers

Known Affected Releases


Description (partial)

uBR10k PRE5 GigabtEthernet0/0/0 is configured for a set speed and duplex, but after a PRE switchover (PRESO) show controllers indicates the GigabitEthernet0/0/0 used auto negotiate for speed / duplex.  From show controllers Gig0/0/0:

  PHY says Link is UP, Speed 100Mbps, Full-Duplex [AUTONEG Done]

  AUTONEG - Our ability is     1000M/FD 1000M/HD 100M/FD 100M/HD 10M/FD 10M/HD
  AUTONEG - Partner ability is 100M/FD 100M/HD 10M/FD 10M/HD

After the PRESO, you may see a very small number of collisions/late collisions and/or deferred on Gig0/0/0

After a uBR10k with redundant PRE5's experiences a manual or automatic PRE switchover, this condition occurs.
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