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When configuring the threshold rate for outbound traffic shaping, the same settings as for inbound rate
limiting (see section 8.1.5) applies. The web interface provides a predefined set of rates (drop-down
list). The CLI allows for more finegrain rate settings:
•
in steps of 64 kbit/s in range 64-1000 kbit/s
•
in steps of 1 Mbit/s in range 1-100 Mbit/s
•
in steps of 10 Mbit/s in range 100-1000 Mbit/s (on Gigabit Ethernet ports)
Traffic shaping calculations consider the layer-2 bits, i.e., from Ethernet destination MAC address to
CRC (interframe gap and preamble bits are not counted).
8.1.7
MDI/MDIX crossover
By default a switch is able to sense which pin to use for reception and which to use for transmission
(auto MDI/MDIX crossover), thus no external crossover cable is necessary. In addition, a port can be
configured statically in MDI (Media Dependent Interface) or MDIX (crossover) mode.
8.1.8
Fall-back default VID
The fall-back default VLAN ID is generally unnecessary to configure.
The purpose of the fall-back default-VID is to control what should happen with ”untagged” packets
entering a port only configured ”tagged” on a set of VLANs. For more information on VLAN features
and the VLAN related terms used throughout this section, see chapter 10.
Every port needs to have a ”default VID”. The default VID specifies the VLAN ID an ”untagged” packet
should be associated with as it enters that port. A port’s default VID is determined as follows:
•
If a port is associated ”untagged” with a VLAN, that VID will be the port’s default VID.
E.g., if a port is associated ”untagged” to VID 10, the port will have VID 10 as its ”default VID”.
•
If a port is not associated ”untagged” with any VLAN, the port’s default VID is determined as:
o
the port’s fall-back default VID, given that a fall-back default-VID is configured, or
o
the default VLAN (VID 1), if no fall-back default-VID is configured.
The fall-back default VID can be used to control whether ”untagged” packets should be accepted on
a port (only) associated ”tagged” with a set of VLANs. If the port’s default VID is represented within
that set of VLANs, the packet will be accepted. Otherwise it will be dropped.
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