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Cisco Bug: CSCur04843 - LLDP with tlv length 0 are dropped

Last Modified

May 08, 2020

Products (12)

  • Cisco Nexus 5000 Series Switches
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 6004 Switch
  • Cisco Nexus 5020 Switch
  • Cisco Nexus 5672UP Switch
  • Cisco Nexus 6001 Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 5696Q Switch
  • Cisco Nexus 56128P Switch
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Known Affected Releases

5.2(1)N1(1a) 7.0(8)N1(1)

Description (partial)

Symptom:
Customer is reporting the following syslog message:

014 Aug  5 17:22:45 mr0s5k03 %LLDP-FEX103-3-INVALID_LLDP_RECEIVED: Received an invalid LLDP on Eth103/1/15
(can also be on chassis ports)

Conditions:
An LLDP peer is including an optional TLV in the LLDP frame with a length of 0.
On nexus side can be checked in lldp event logs :
show system internal lldp event-history errors 
...
Event:E_DEBUG, length:44, at 746661 usecs after Fri Aug  8 08:53:11 2014
     [102] lldp_pkt_parse : Bad tlv: type/len 5/0
...
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Bug Details Include

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