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User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
573
Interface Configuration (Ethernet, Port Channel)
Command Usage
A port, or a trunk with switchport mode set to hybrid, must be assigned to a VLAN as untagged.
If a trunk has switchport mode set to trunk (i.e., 1Q Trunk), then you can only assign an interface to VLAN groups as a
tagged member.
Frames are always tagged within the switch. The tagged/untagged parameter used when adding a VLAN to an interface
tells the switch whether to keep or remove the tag from a frame on egress.
If none of the intermediate network devices nor the host at the other end of the connection supports VLANs, the interface
should be added to these VLANs as an untagged member. Otherwise, it is only necessary to add at most one VLAN as
untagged, and this should correspond to the native VLAN for the interface.
If a VLAN on the forbidden list for an interface is manually added to that interface, the VLAN is automatically removed
from the forbidden list for that interface.
Example
The following example shows how to add VLANs 1, 2, 5 and 6 to the allowed list as tagged VLANs for port 1:
Console(config)#interface ethernet 1/1
Console(config-if)#switchport allowed vlan add 1,2,5,6 tagged
Console(config-if)#
switchport forbidden vlan
This command configures forbidden VLANs. Use the no form to remove the list of forbidden VLANs.
Syntax
switchport forbidden vlan {add vlan-list | remove vlan-list}
no switchport forbidden vlan
add vlan-list -List of VLAN identifiers to add.
remove vlan-list -List of VLAN identifiers to remove.
vlan-list - Separate nonconsecutive VLAN identifiers with a comma and no spaces; use a hyphen to designate a range of
IDs. Do not enter leading zeros. (Range: 1-4094).
Default Setting
No VLANs are included in the forbidden list.
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
This command prevents a VLAN from being automatically added to the specified interface via GVRP.
If a VLAN has been added to the set of allowed VLANs for an interface, then you cannot add it to the set of forbidden