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What is trunk port mode?
A trunk port allows you to send all those signals for each switch or router across a single trunk link. In contrast to an access port, a trunk port must use tagging in order to allow signals to get to the correct endpoint.
How do I designate ports as trunk ports?
To enable trunk links, configure the ports on either end of the physical link with parallel sets of commands. To configure a switch port on one end of a trunk link, use the switchport mode trunk command. With this command, the interface changes to permanent trunking mode.
How do I turn off trunking switch ports?
If you want to disable trunking completely, use the off option for a COS switch or the no switchport mode trunk command on an IOS switch.
How do I allow a specific VLAN on a trunk port?
By default, a trunk interface can carry traffic for all VLANs. To specify that only certain VLANs are allowed on the specified trunk, use the switchport trunk allowed vlan command. If you do not configure this parameter, the trunk port uses the default VLAN as the native VLAN ID.
Can a switch port be access and trunk?
Each port on a Cisco switch can be configured as either an access or a trunk port. The type of a port specifies how the switch determines the incoming frame’s VLAN. Here is a description of these two port types: access port – a port that can be assigned to a single VLAN.
Is a trunk port tagged or untagged?
VLAN enabled ports are generally categorized in one of two ways, tagged or untagged. These may also be referred to as “trunk” or “access” respectively. The purpose of a tagged or “trunked” port is to pass traffic for multiple VLAN’s, whereas an untagged or “access” port accepts traffic for only a single VLAN.
Is it possible to specify range of ports for trunking?
When enabling trunking, it is not possible to specify a range of ports. Trunking is on for these links. They will also send DTP signals that attempt to initiate a trunk with the other side. This will form a trunk with other ports in the states on, auto, or desirable that are running DTP.
How is the Switch port Trunk Mode configured?
Error#2. A switch port Trunk link is configured manually with the switchport mode trunk command. Trunk ports use DTP advertisements to negotiate the state of the link with the remote switch port.
What are the characteristics of the Trunking mode?
Table 6-2 Trunking Mode Characteristics COS set vlan number mod/port IOS (global) interface type mod/port (interf
How is a trunk port different from a VLAN?
A trunk port is by default a member of all the VLANs that exist on the switch and carry traffic for all those VLANs between the switches. To distinguish between the traffic flows, a trunk port must mark the frames with special tags as they pass between the switches. Trunking is a function that must be enabled on both sides of a link.