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Rate limit flood counters


Userlevel 1
Hi all,

I have set on my switches the rate limit for broadcast and multicast traffic to 1000 pps, i can see the Flood Rate Exceeded counter incrementing when i type the command "show port rate-limit flood refresh port-number", the configuration is also set to send a trap and log.

configure port 1:49 rate-limit flood broadcast 1000 out-actions log trap
configure port 1:49 rate-limit flood multicast 1000 out-actions log trap

My question is while the counter is incrementing i dont see any trap or log being generated.

3 replies

Userlevel 5
That is by design, only the first instance of the Flood rate exceeded will trigger a log entry, all subsequent increments won't. Imagine if your counter incremented by 10,000, your entire log would be overwritten. You can create a script to periodically clear the rate-limit counters
Userlevel 6
Hi,

You could try the below command which would clear the rate-limit flood status of the port. After clearing it, when the configured limit is exceeded, the log and trap would be sent.

clear ports 1:49 rate-limit flood out-of-profile status

Lab output:

Slot-1 WB-Comms.73 # clear ports 1:2 rate-limit flood out-of-profile status

SNMP stats: InPkts 0 OutPkts 4 Errors 0 AuthErrors 0
Gets 0 GetNexts 0 Sets 0 Drops 0
SNMP traps: Sent 4 AuthTraps Enabled
SNMP inform: Sent 0 Retries 0 Failed 0

Slot-1 WB-Comms.77 # sh log
03/15/2016 02:13:23.41 [i] Slot-1: Ingress traffic on port 1:2 exceeded a Flood Control Limit resulting in change of out-of-profile status to true.
03/15/2016 02:13:19.65 [i] Slot-1: Port 1:2 link UP at speed 1 Gbps and full-duplex
03/15/2016 02:13:03.28 [i] Slot-1: Port 1:2 link down

Hope this helps!
Userlevel 1
Great, Thank you for the information.

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