Technical Tip: How to view the multicast and broadcast traffic hitting on the FortiAP

[pprince]

Description	This article describes how to view broadcast and multicast traffic hitting the FortiAP.
Scope	All FortiAP.
Solution	In certain cases, the FortiAP's CPU utilization is higher than normal, which results in delay and impairs network performance overall. When the FortiAP is hitting a huge amount of traffic, there are cases when the CPU and memory on the FortiAP spike up. For example, refer to the below commands on the FortiAP CLI: perf CPU Load : 100% CPU1 Load : 43% CPU2 Load : 43% CPU3 Load : 31% CPU4 Load : 42% Memory Usage: 99%  To see if memory is used by daemon or kernel: meminfo MemTotal: 890108 kB MemFree: 267268 kB MemAvailable: 345988 kB Buffers: 15688 kB Cached: 64036 kB SwapCached: 0 kB Active: 79588 kB Inactive: 26504 kB Active(anon): 27884 kB Inactive(anon): 480 kB Active(file): 51704 kB Inactive(file): 26024 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 0 kB SwapFree: 0 kB Dirty: 0 kB Writeback: 0 kB AnonPages: 26368 kB Mapped: 16868 kB Shmem: 1996 kB Slab: 444152 kB SReclaimable: 15128 kB SUnreclaim: 429024 kB KernelStack: 3120 kB PageTables: 876 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 445052 kB Committed_AS: 52776 kB VmallocTotal: 258998208 kB VmallocUsed: 0 kB VmallocChunk: 0 kB Log in to the FortiAP CLI:  tcpdump -i eth0 ether broadcast or ether multicast