Symptom
When Navigating to Fabric > Inventory > any leaf/spine > select Interface from the window pane
Error message will be displayed "Error Received Invalid Json String."
Conditions
LLDP packet received on the N9k has a Port ID value of "1 \0x0a, Port 1" (new line break in the value) which causes the JSON error to occur.
tcpdump -i kpm_inb ether proto 0x88cc -vv > /data/techsupport/test.txt
15:03:28.104364 LLDP, length 175
Chassis ID TLV (1), length 37
Subtype Local (7): 39373638-3935-584D-5139-303130315943
0x0000: 0733 3933 3733 3633 382d 3339 3335 2d35
0x0010: 3834 442d 3531 3339 2d33 3033 3133 3033
0x0020: 3135 3934 33
Port ID TLV (2), length 13
Subtype Interface Name (5): 1 \0x0a, Port 1
0x0000: 0520 3120 0a2c 2050 6f72 7420 31
Workaround
Modify the device connecting to ACI to no longer be sending a value containing a line break. Another option is to disable LLDP if it is not required for VMM integration etc.
