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Cisco Bug: CSCuj54648 - STP blocked port passing traffic on 3560 and 3750v2

Last Modified

Nov 27, 2020

Products (175)

  • Cisco Catalyst 3560 Series Switches
  • Cisco Catalyst 2960S-24PD-L Switch
  • Cisco Catalyst 3560E-48PD-SF Switch
  • Cisco Catalyst 3560CG-8TC-S Compact Switch
  • Cisco Catalyst 3560X-48T-E Switch
  • Cisco Catalyst 3560E-24TD-S Switch
  • Cisco Catalyst 3750V2-24FS Switch
  • Cisco Catalyst 3750G-12S Switch
  • Cisco Catalyst 2960G-24TC-L Switch
  • Cisco Catalyst 3560X-48P-S Switch
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Known Affected Releases

12.2(55)SE8 15.0(2)SE4

Description (partial)

TCP malformed packet is received and forwarded by the blocked port on the WS-C3560-48PS.  This causes the TCP malformed packet to be looped in 
the network continuously and be flooded on all the ports in the vlan

WS-C3560-48PS running 12.2(55)SE8

TCP packet with incorrect checksum on the TCP header is induced into the network
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