Allied Telesis AT-S20 - Manual (Page 69)

AT-S20 User’s Guide
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Uplink ports (15 and 10 on both switches) are used to connect the
two switches. To allow VLANs to span across switches, these uplink
ports are output enabled for every configured VLAN on the switch.
Therefore, when a broadcast packet is received on any port
(representing a packet on any VLAN), it is transmitted through the
uplink port. Note that since the uplink port on the AT-3714FXL has
PVID of “3”, packets transmitted on the uplink port from VLAN 2 or
the “Default VLAN” will be transmitted with their VLAN tag in place.
This scheme preserves the VLAN information across the uplink port.
In this example, Workstation #4 can talk with Server A because its
VLAN information is preserved across the uplink. In turn, Workstation
#1 can talk with Server B for the same reason. Workstation #2 is
precluded from talking to Server B since Server B has a different
VLAN, and any packets generated from Workstation #2 that traverse
the uplink port will continue to be associated with VLAN 2.
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By default, only one VLAN is defined in a 3700XL switch. Up to 32
VLANs can be defined in the unit. A VLAN is defined when the
following occurs:
❑ Name the VLAN
❑ Assign a VLAN ID number
❑ Define a port configuration to be used for that VLAN
By default, the VLAN named “Default VLAN” is assigned and given a
VLAN ID and PVID of 1, and all ports receive packets for this VLAN.
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Each port must be assigned a PVID. The VLAN can be chosen from
one of the VLANS defined in the VLAN configuration. By default, all
ports belong to the “Default VLAN” which has a PVID of 1.