Ubiquiti airFiber 5 User Manual

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29Chapter 7: Advanced TabairFiber® AF5/AF5U User GuideUbiquiti Networks, Inc.control has the effect of controlling the inter-packetspacing of packets headed into the airFiber Data interface.Multicast Filter If enabled, the filter blocks multicasttraffic from overloading the CPU when in-bandmanagement is enabled. This allows the airFiber AF-5 tobe managed in-band when the customer’s network iscarrying large volumes of multicast traffic, such as IPTV.The filter does not block multicast traffic going overthe radio; it simply blocks it from reaching the airFiber’smanagement interface CPU.Track Radio Link If this option is enabled, the airFiberAF-5 disconnects the Data port’s Ethernet link when theRF link is lost (The Management port is never disabled bythis option). The Track Radio Link option is useful becauseit quickly indicates a “link lost” condition to the customer’srouting equipment (such as a direct connection toOSPF-enabled routers).• Disabled The Track Radio Link option is disabled bydefault. The Data port’s Ethernet link will always remainup regardless of the RF link state.• Use Timeout Duration This option is designed for useby operators who are using in-band management. Twotimers control the Data port’s Ethernet link.RF Link Ethernet Link NotesGoes down forthe first timeThe Ethernet link goesdown and remainsdown for the numberof seconds specified bythe Link Off Durationtimer.The Ethernet link willthen come back up sothat the airFiber AF-5can be managed evenwhen the RF link isdown.Even if the RF link goesback up before theLink Off Duration timerelapses, the Ethernetlink remains down.The Ethernet link’sdowntime is longenough to signal tothe customer’s routingequipment that thepath is lost.RF Link Ethernet Link NotesGoes downfor thesecond timeThe Ethernet linkremains up as long astime remains on theLink Off Spacing timer.When the Link OffSpacing timer elapses,then the Ethernet linkgoes down again forthe number of secondsspecified by the LinkOff Duration timer. (Thishappens only if the RFlink is still down.)The Ethernet link’suptime is long enoughso the operator hasenough time to accessthe airFiber AF-5, makeconfiguration changes,and save those changes.Sufficient Ethernet linkuptime is vital when aRF link is constantly upand down.When the Use Timeout Duration option is enabled, thenthe Track Radio Link option and the following timers areenabled:- Link Off Duration The Link Off Duration timercontrols the length of time the Data port’s Ethernetlink will be down if the RF link goes down. Enter thenumber of seconds that the Ethernet link should beoffline. For example, if this is set to 10 seconds, thenwhen the RF link goes down, the Ethernet link will godown and remain down for 10 seconds (regardless ofthe RF link state), and then it will go back up.- Link Off Spacing The Link Off Spacing timer controlsthe length of time the airFiber AF-5 will wait beforeallowing the Data port’s Ethernet link to go down fora second time if the RF link goes down again. Enterthe minimum interval (in seconds) between offlineevents of the Ethernet link, regardless of the RF linkstatus. The value for Link Off Spacing should be largerthan the value for Link Off Duration, and it should beenough time for the operator to access the airFiberAF-5, make any configuration changes, and applythose changes.Note: If the Link Off Spacing timer is set to0 seconds, then the Ethernet link will only use theLink Off Duration timer. If the Link Off Durationtimer is set to 10 seconds and the RF link goesdown, then the Ethernet link will go down for10 seconds and then go back up regardless of theRF link state. If the RF link is still down, then theEthernet link will not go down again until the RFlink goes back up and then down again.Here are a couple of examples involving the use of theUse Timeout Duration option.• Example #1• Link Off Duration 5 seconds• Link Off Spacing 60 secondsThe Data port’s Ethernet link will be initiallydisconnected when the RF link first goes down. Thatevent will start a 60-second timer. The Ethernet linkwill remain offline for 5 seconds (regardless of the RFlink status) and then come back online. The Ethernetlink will remain online (regardless of the RF linkstate) until the 60-second timer expires.