Description

There was no LLDP information reflecting at the side of the Meraki APs, despite LLDP enabled on both sides.

Symptoms

From Juniper side we did observe LLDP information for the APs:

 

root@switch> show lldp neighbors | no-more
Local Interface   Parent Interface   Chassis Id         Port info         System Name
ge-1/0/45         -                  xx:xx:xx:xx:xx:xx  eth0              AP17        
ge-1/0/41         -                  xx:xx:xx:xx:xx:xx  eth0              AP25        
ge-0/0/44         -                  xx:xx:xx:xx:xx:xx  eth0              AP16        
ge-1/0/43         -                  xx:xx:xx:xx:xx:xx  eth0              AP21        
ge-1/0/39         -                  xx:xx:xx:xx:xx:xx  eth0              AP29        
ge-0/0/41         -                  xx:xx:xx:xx:xx:xx  eth0              AP22        
ge-1/0/40         -                  xx:xx:xx:xx:xx:xx  eth0              AP27        
ge-1/0/46         -                  xx:xx:xx:xx:xx:xx  eth0              AP15        
ge-1/0/44         -                  xx:xx:xx:xx:xx:xx  eth0              AP19        
ge-0/0/45         -                  xx:xx:xx:xx:xx:xx  eth0              AP14        
ge-1/0/38         -                  xx:xx:xx:xx:xx:xx  eth0              AP31     
...

 

There’s also no errors on LLDP for the ports with Meraki APs:

 

root@switch> show lldp statistics | no-more
Interface   Parent Interface Received Unknown TLVs With Errors Discarded TLVs Transmitted Untransmitted
ge-0/0/1    -                158374   0            0           158374         181191      0        
ge-0/0/13   -                264      0            0           0              8676        0        
ge-0/0/14   -                35       0            0           0              898         0             
ge-0/0/36   -                425595   0            0           0              924908      0        
ge-0/0/37   -                701766   0            0           0              1533354     0        
ge-0/0/38   -                701848   0            0           0              1537294     0        
ge-0/0/39   -                701669   0            0           0              1538673     0        
ge-0/0/4    -                119483   0            0           0              759023      0        
ge-0/0/40   -                701640   0            0           0              1538043     0        
ge-0/0/41   -                701700   0            0           0              1531843     0        
ge-0/0/42   -                701635   0            0           0              1552514     0        
ge-0/0/43   -                361670   0            0           0              786138      0        
ge-0/0/44   -                701658   0            0           0              1535131     0        
ge-0/0/45   -                468095   0            0           0              1030793     0        
ge-0/0/46   -                415335   0            0           0              914875      0        
ge-0/0/47   -                758608   0            0           0              758591      0        
ge-1/0/38   -                701837   0            0           0              1533855     0
...

  

Solution

LLDP started reflecting properly after disabling CDP on the Meraki APs. It seems Juniper switches were flooding the CDP packets and overloading the AP, thus, they were not able to process the LLDP packets correctly.

Modification History

2025-02-21 : Article Created