ExtremeSwitching (EXOS)

  • 1.  Rate limit flood counters

    Posted 03-14-2017 07:34
    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.

  • 2.  RE: Rate limit flood counters

    Posted 03-14-2017 08:34
    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

  • 3.  RE: Rate limit flood counters

    Posted 03-14-2017 08:49

    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!

  • 4.  RE: Rate limit flood counters

    Posted 03-14-2017 09:13
    Great, Thank you for the information.