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Ethernet Bridge and VLANs
4.5
Optional Incoming Traffic Validation
Introduction
The Ethernet bridge can be configured to explicitly control the handling of
any of its bridge ports. Unexpected frames are for example untagged frames or tagged frames coming in on
an incorrect bridge port.
Following concepts can be used to control unexpected frames:
Port VID (PVID)
Acceptable frame types
Ingress filtering
Each of these concepts is configurable per bridge port using the command
Port VID (PVID)
Each bridge port is configured with the
and priority-tagged
The PVID must be a VLAN of which the bridge port is
untagged member of the same VLAN. This parameter is mandatory and this is the main reason why each
bridge port has to be untagged member of at least one VLAN.
By default, the PVID of a bridge port is the default VLAN. To modify this configuration, execute following
command:
=>:eth bridge ifconfig intf=ethport1 vlan=video
As the OBC is untagged member of maximum one VLAN (the default VLAN) and the PVID must be
a VLAN of which the port is untagged member, the PVID of the OBC is always the default VLAN.
Be careful when modifying the PVID of a bridge port. A violation of the rule that the bridge port
must be untagged member of the PVID VLAN is not always reported by the Thomson Gateway.
Acceptable frame types
Each bridge port can be configured with the
the
frame format
If the parameter is disabled, both VLAN-tagged and non VLAN-tagged frames (i.e. untagged or priority-
tagged frames) are allowed on the port. Non VLAN-tagged frames are mapped to the VLAN that
corresponds with the PVID.
If the parameter is enabled, only VLAN-tagged frames are allowed. Non VLAN-tagged frames are
dropped.
By default, the parameter is disabled. To enable this parameter, execute following command:
=>:eth bridge ifconfig intf=ethport1 acceptvlanonly=enabled
20
vlan
(VID = 0) frames received on that port are handled as if they belong to that VLAN.
of ingress traffic:
parameter, also referred to as the port VID (PVID). All
untagged
member, as it is not possible to be tagged and
acceptvlanonly
parameter. This parameter is used to check
unexpected frames
coming in on
:eth bridge ifconfig
untagged
E-DOC-CTC-20080229-0001 v1.0
.
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