Ubiquiti Networks airFibe24 - Manual (Page 31)

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Chapter 7: Advanced Tab airFiber ® AF24 User Guide
Ubiquiti Networks, Inc.
Multicast Filter If enabled, the filter blocks multicast
traffic from overloading the CPU when in-band
management is enabled. This allows the airFiber AF24
to be managed in-band when the customer’s network is
carrying large volumes of multicast traffic, such as IPTV.
The filter does not block multicast traffic going over
the radio; it simply blocks it from reaching the airFiber’s
management interface CPU.
Track Radio Link If this option is enabled, the airFiber
AF24 disconnects the Data port’s Ethernet link when the
RF link is lost (The Management port is never disabled by
this option). The Track Radio Link option is useful because
it quickly indicates a “link lost” condition to the customer’s
routing equipment (such as a direct connection to
OSPF-enabled routers).
• Disabled The Track Radio Link option is disabled by
default. The Data port’s Ethernet link will always remain
up regardless of the RF link state.
• Use Timeout Duration This option is designed for use
by operators who are using in-band management. Two
timers control the Data port’s Ethernet link.
RF Link Ethernet Link Notes
Goes down for
the first time The Ethernet link goes
down and remains
down for the number
of seconds specified by
the Link Off Duration
timer.
The Ethernet link will
then come back up so
that the airFiber AF24
can be managed even
when the RF link is
down.
Even if the RF link goes
back up before the
Link Off Duration timer
elapses, the Ethernet
link remains down.
The Ethernet link’s
downtime is long
enough to signal to
the customer’s routing
equipment that the
path is lost.
Goes down
for the
second time The Ethernet link
remains up as long as
time remains on the
Link Off Spacing timer.
When the Link Off
Spacing timer elapses,
then the Ethernet link
goes down again for
the number of seconds
specified by the Link
Off Duration timer. (This
happens only if the RF
link is still down.)
The Ethernet link’s
uptime is long enough
so the operator has
enough time to access
the airFiber AF24, make
configuration changes,
and save those changes.
Sufficient Ethernet link
uptime is vital when a
RF link is constantly up
and down.
When the Use Timeout Duration option is enabled, then
the Track Radio Link option and the following timers are
enabled:
- Link Off Duration The Link Off Duration timer
controls the length of time the Data port’s Ethernet
link will be down if the RF link goes down. Enter the
number of seconds that the Ethernet link should be
offline. For example, if this is set to 10 seconds, then
when the RF link goes down, the Ethernet link will go
down and remain down for 10 seconds (regardless of
the RF link state), and then it will go back up.
- Link Off Spacing The Link Off Spacing timer controls
the length of time the airFiber AF24 will wait before
allowing the Data port’s Ethernet link to go down for
a second time if the RF link goes down again. Enter
the minimum interval (in seconds) between offline
events of the Ethernet link, regardless of the RF link
status. The value for Link Off Spacing should be larger
than the value for Link Off Duration, and it should be
enough time for the operator to access the airFiber
AF24, make any configuration changes, and apply
those changes.
Note: If the Link Off Spacing timer is set to
0 seconds, then the Ethernet link will only use the
Link Off Duration timer. If the Link Off Duration
timer is set to 10 seconds and the RF link goes
down, then the Ethernet link will go down for
10 seconds and then go back up regardless of the
RF link state. If the RF link is still down, then the
Ethernet link will not go down again until the RF
link goes back up and then down again.
Here are two examples:
• Example #1
• Link Off Duration 5 seconds
• Link Off Spacing 60 seconds
The Data port’s Ethernet link will be initially
disconnected when the RF link first goes down. That
event will start a 60-second timer. The Ethernet link
will remain offline for 5 seconds (regardless of the RF
link status) and then come back online. The Ethernet
link will remain online (regardless of the RF link
state) until the 60-second timer expires.
• Example #2
• Link Off Duration 20 seconds
• Link Off Spacing 120 seconds
The Data port’s Ethernet link will be initially
disconnected when the RF link first goes down. That
event will start a 120-second timer. The RF link goes
back up after 10 seconds; however, that does not
affect the Ethernet link. The Ethernet link will remain
offline for 20 seconds and then come back online.
The RF link goes down again after 60 seconds;
however, that does not affect the Ethernet link.
The Ethernet link will then remain online until the
120-second timer expires.