Cambium Networks PMP 450d Series, Руководство пользователя

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Chapter 3: System planning Data network planning
Page 3-32
Special case VLAN numbers
This system handles special case VLAN numbers according to IEEE specifications:
Table 67 Special case VLAN IDs
VLAN Number Purpose Usage Constraint
0
These packets have 802.1p priority, but are
otherwise handled as untagged. Must not be used as a
management VLAN.
1
Although not noted as special case by IEEE
specifications, these packets identify traffic
that was untagged upon ingress into the SM
and must remain untagged upon egress.
This policy is hard-coded in the AP.
Must not be used for
system VLAN traffic.
4095 This VLAN is reserved for internal use. Must not be used at all.
SM membership in VLANs
With the supported VLAN functionality, the radios determine bridge forwarding on the basis of not
only the destination MAC address, but also the VLAN ID of the destination. This provides flexibility
in how SMs are used:

Each SM can be a member in its own VLAN.

Each SM can be in its own broadcast domain, such that only the radios that are members of
the VLAN can see broadcast and multicast traffic to and from the SM.

The network operator can define a work group of SMs, regardless of the AP(s) to which they
register.