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.
