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Community Member

VLANs

Dear all,

what is the difference between " access ports and trunk ports"?

please suggest me any link related to it?

thank u

raj

7 REPLIES
Community Member

Re: VLANs

basically,

a single host gets plugged into an access port and you plug other switches into trunk ports. you assign allowed vlans to a trunk port. any traffic that is tagged with those particular vlans gets passed through that port. sorry i dont have a link for you

Hall of Fame Super Bronze

Re: VLANs

An access-port only carries one VLAN information. There isn't any VLAN tagging involved.

A trunk-port carries multiple VLANs and VLAN tagging takes place between devices forming the trunk.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3560/12225see/scg/swvlan.htm

Cisco Employee

Re: VLANs

Raj,

An accessport belongs to a singlle vlan only and carries on that vlan's information.The access port carries a port vlan ID which the Vlan ID to which the accessport belongs. While the trunkport carries the traffic for multiple vlans and adds a Tag to each vlan as it traverses across the trunk port.

http://www.ciscopress.com/articles/article.asp?p=29803&seqNum=3

HTH,

-amit singh

Community Member

Re: VLANs

Hi Raj,

Amit Singh reply to your query is Correct.

Re: VLANs

HI Raj, [Pls Rate if Helps]

Switch Port Modes

Switch ports run in either access or trunk mode. In access mode, the interface belongs to one and only one VLAN. Normally a switch port in access mode attaches to an end user device or a server. The frames transmitted on an access link look like any other Ethernet frame.

Trunks, on the other hand, multiplex traffic for multiple VLANs over the same physical link. Trunk links usually interconnect switches. However, they may also attach end devices such as servers that have special adapter cards that participate in the multiplexing protocol.

Pls Rate if HELPS

Best Regards,

Guru Prasad R

Community Member

Re: VLANs

in layman terms...

if you are connecting pc or any uplink device to the port of a switch it will be an switch port access mode..

if you configure VLANS on multiple Switches and they need to be conencted together (so that VLAN-2's information from switch1 can be passed to VLAN-2 on switch2) then you will mark these ports as Switch port trunk mode. (Called trunking in VLAN)

this way only VLAN - VLAN controlling information is passes between these ports and these ports do not pass data.

hope that helps.. :-)

plz rate..

Hall of Fame Super Blue

Re: VLANs

Hi

If i have understood you correctly then one of your points needs clarifying. Trunk ports do pass data, otherwise how would a client PC connected to one switch send data to server connected to another switch if the only thing connecting these 2 switches are trunk ports.

Trunks can pass muliple vlan data, access ports pass only a single vlans traffic.

HTH

Jon

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