6-3. Trunking
VLANs are local to each switch's database, and VLAN information is not passed between switches.
Trunk links provide VLAN identification for frames traveling between switches.
Cisco switches have two Ethernet trunking mechanisms: ISL and IEEE 802.1Q.
Certain types of switches can negotiate trunk links.
Trunks carry traffic from all VLANs to and from the switch by default but can be configured to carry only specified VLAN traffic.
Trunk links must be configured to allow trunking on each end of the link.
Enabling Trunking
Trunk links are required to pass VLAN information between switches. A port on a Cisco switch is either an access port or a trunk port. Access ports belong to a single VLAN and do not provide any identifying marks on the ...
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