A VLAN trunk allows for data to travel across a single link between two devices even if the data is from multiple VLANs. This allows for reduced cabling needed as for you won't have to run multiple cables between switches in order to have up-links for every VLAN.
It is the VLAN that supports untagged traffic on an 802.1Q trunk
native vlan
A trunk connection is affected by broadcast storms on any particular VLAN that is carried by that trunk.
Based on the VLAN tag.
Access like carry the single vlan information & Trunk link able to carry the multiple vlan information when frames are travels from trunk mani shanker
Vlan trunk Protocol
• Access link: An access link is a link that is part of only one VLAN, and normally access links are for end devices. Any device attached to an access link is unaware of a VLAN membership. An access-link connection can understand only standard Ethernet frames. Switches remove any VLAN information from the frame before it is sent to an access-link device.• Trunk link: A Trunk link can carry multiple VLAN traffic and normally a trunk link is used to connect switches to other switches or to routers. To identify the VLAN that a frame belongs to, Cisco switches support different identification techniques (VLAN Frame tagging). Our focus for CCNA examination is on Inter-Switch Link (ISL) and 802.1Q.A trunk link is not assigned to a specific VLAN. Many VLAN traffic can be transported between switches using a single physical trunk link.
switch(config)#int type <no> switch(config-if)#switchport mode trunk switch(config-if)#switchport trunk allowed vlan all/vlan no switch(config-if)#exit switch(config)#exit switch#
A Port VLAN ID (pvid) is a default VLAN ID that is assigned to an access port to designate the virtual LAN segment to which this port is connected. The pvid places the port into the set of ports that are connected under the designated VLAN ID. Also, if a trunk port has not been configured with any VLAN memberships, the virtual switch's Port VLAN ID (pvid) becomes the default VLAN ID for the ports connection.
A physical router device with an interface that routes between two or more VLANs that are attached to a VLAN network segment by a trunk link. In other words a " router on a [ TRUNK ] " which is originating from switches with independent non routing VLANs.
... an access port, which carries traffic only to and from the specific VLAN assigned to it. Contrast with 'trunk port' See http://searchnetworking.techtarget.com/definition/trunk
inter_vlan routing on d'link DGS3612 is automatic,you just creates vlan and tag them to the port access and trunk