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Cisco Bug: CSCsz97323 - 3750 does not send an agreement on alternate and backup port with RSTP

Last Modified

Feb 22, 2018

Products (51)

  • Cisco Catalyst 3750 Series Switches
  • Cisco Catalyst 3750G-12S Switch
  • Cisco Catalyst 3560E-48PD-SF Switch
  • Cisco Catalyst 2960-24-S Switch
  • Cisco Catalyst 3560E-48PD-E Switch
  • Cisco Catalyst 3560E-12D-E Switch
  • Cisco Catalyst 3750V2-24PS Switch
  • Cisco Catalyst 3560E-24TD-S Switch
  • Cisco Catalyst 2960-48TT-S Switch
  • Cisco Catalyst 3750-48PS Switch
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Known Affected Releases


Description (partial)

When Cat3750 is connected to HUB with two cables, Cat3750 does not send agreement on alternate and backup port with Rapid-PVST. So the convergence takes 30 sec.
Cat3750 is connected to HUB with two cable.
The ports become Designated Port and Backup Port.
When the cable on Designated Port is unplugged and plugged, this issue occurs.
When using MST, this does not occur on backup port.
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