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Knowledge Base

LLDP bad packets alarm in log on S5700

Publication Date:  2014-02-28  |   Views:  2095  |   Downloads:  0  |   Author:  l00509000  |   Document ID:  EKB1000037998

Contents

Issue Description

Our switch S5700 connets to Cisco. There is LLDP alarm generated on S5700.
Nov 12 2013 09:30:46 S5700%%01LLDP/4/BAD_PACKET(l)[2]:2 invalid packets were received after latest notification. The last invalid packet came from interface GigabitEthernet0/0/1.

Alarm Information

Nov 12 2013 09:30:46 S5700%%01LLDP/4/BAD_PACKET(l)[2]:2 invalid packets were received after latest notification. The last invalid packet came from interface GigabitEthernet0/0/1.

Handling Process

1. From the log, we can see S5700 receives LLDP from Cisco. Using below debugging command to check the LLDP packet
debugging lldp packet  interface  GigabitEthernet  0/0/1
debugging lldp event  interface  GigabitEthernet  0/0/1

2. We found below error in debugging.
Nov 12 2013 13:51:00.430.2-05:13 S5328C-EI_96 DBGCENTER/7/DEBUG:pkt check fail for sys cap not same in LLDP_IsPacketValid.

After analyzed the LLDP packets from Cisco, we found packets from Cisco indicate they support Bridge Capabilities in Capabilities TLV. However,  Cisco enable two capabilities Bridge and Router
 
Regarding standard LLDP protocol, this kind of packets should be dropped.


3. LLDP packets from Cisco is no standard. Let customer disable LLDP on Cisco. And it is solved.

Root Cause

None

Suggestions

None