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QMultiFlex-400™ Installation and Operating Handbook
Active Queue Management continually measures the packet delay through the modem and
rather than let the backlog of packets build up, it ensures that the delay through the modem
is kept constant by dropping packets early if required. (The modem implements a form of
active queue management called CoDel, which stands for Constant Delay. The delay has
been preset to 5ms, from packet ingress to egress, which is suitable for most applications.
It can be changed 'under the hood' – please contact Customer Support for details.) The
effect of this is that transit times through the network typically continue to be constant even
in an overload situation.
The use of AQM can be combined with traffic shaping to ensure that high priority traffic is
unaffected when demands on bandwidth are exceeded.
The use of AQM is especially important for latency sensitive applications and where the
packet latency over the satellite link is measured to ensure compliance with a Service Level
Agreement (SLA). It needs to be enabled on the modems at both ends of the satellite link
in order to be effective.
6.2.22.18
Ethernet Address Learning
This option is no longer relevant with the IP processing card installed. Default is 'Off'. The
processing card also has ethernet address learning turned off.
6.2.22.19
M&C VLAN
This is an On/Off control that controls whether M&C traffic destined for the remote modems
is transmitted in a special VLAN. When the control is checked, all M&C traffic for the remote
modems is sent over satellite using the M&C VLAN ID value (default 0).
Warning: The network address range (subnet) used for the M&C VLAN should
not overlap with any traffic VLANS. This could produce unwelcome effects.
6.2.22.20
M&C VLAN ID
Range
0 to 4095 (default 0)
Description:
This is the VLAN ID used for the M&C VLAN. When M&C VLAN is
enabled at the remote side, it creates an M&C IP link for the control of
the remote modem, and anything connected to the remote modem i.e.
an IP interface of a BUC. This M&C VLAN will pass through any VLAN
filtering used at the remote side. Note: The default value of zero should
be changed to a positive value more than zero, within the range, and
different to any traffic VLAN IDs. Changing this value requires a power
cycle of the modem for the new value to be used.
Figure 6-44 Edit->IP->M&C VLAN Settings
Table 6-46 M&C VLAN ID
6-59
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