Controller Based WLANs

How do I get a single SNMP trap per AP up/down, instead of multiple alerts?

Product and Software: This article applies to ArubaOS 3.1 and later.

 

The two kinds of alerts for an AP up/down event are:

  • AP up/down trap
  • BSSID up/down trap

 

You can avoid false alarms and reduce the volume of trap messages by disabling the BSSID up/down traps (wlsxBSSIDIsUp/wlsxBSSIDIsDown, 1109/1110) and using the AP up/down traps instead (wlsxNAccessPointIsUp/wlsxNAccessPointIsDown, 1040/1041).

 

(ArubaOS 3.x is required for specific trap configuration.)

 

The following are the steps to disable wlsxBSSIDIsUp & wlsxBSSIDIsDown traps in the Controller CLI:

  • configure terminal
  • snmp-server trap disable wlsxBSSIDIsDown
  • snmp-server trap disable wlsxBSSIDIsUP
  • end
  • write memory

When AP up/down traps are used, a down trap is posted about 2 minutes after the AP goes down (and heartbeat/keepalive counts are exhausted), and an up trap immediately the AP has registered.

Here is an excerpt from an AP Down trap packet, with Switch IP, Trap Number, and AP wired-MAC higlighted:

 

            enterprise: 1.3.6.1.4.1.14823.1.1.4
            (SNMPv2-SMI::enterprises.14823.1.1.4)
            agent-addr: internet (0)
                internet: 129.10.6.231 (192.168.6.231)
            generic-trap: enterpriseSpecific (6)
            specific-trap: 1041
            time-stamp: 495749100
            variable-bindings: 2 items
                Item
                    name: 1.3.6.1.4.1.14823.2.3.1.11.1.1.60
                    (SNMPv2-SMI::enterprises.14823.2.3.1.11.1.1.60)
                    valueType: value (0)
                        value: simple (4294967295)
                            simple: string-value (1)
                                Value: Hex-STRING: 07 D8 02 0F 0F 08 12 00 2D 05 00
                Item
                    name: 1.3.6.1.4.1.14823.2.3.1.11.1.1.1.0
                    (SNMPv2-SMI::enterprises.14823.2.3.1.11.1.1.1.0)
                    valueType: value (0)
                        value: simple (4294967295)
                            simple: string-value (1)
                                Value: Hex-STRING: 00 0B 86 C0 9A 1C

 

The minor disadvantage is that the AP is only identified by its wired MAC in this trap.

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Last update:
‎06-30-2014 07:51 PM
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