Configuring Cisco Trunk Links

As a CCNA candidate you have to be accustomed to the functions and configuration of trunk links.

 

In temporary, a trunk hyperlink is any connection between two switches where there may be the need to carry visitors for a number of VLANs.

 

When a switch sends site visitors out of one in all it's change ports belonging to a VLAN throughout to a unique swap it ought to mark the body as being a member of that originating VLAN on the sending swap in order that the receiving swap can determine into which VLAN to place the frame.

 

Within the CCNA there are numerous strategies of trunk hyperlink configuration that you should know and understand.

 

The first methodology of trunk hyperlink configuration you possibly can know for the CCNA is the mode referred to as dynamic desirable. On this mode the port will take it upon itself to negotiate with the peer connecting port to change into a trunk link. This Protocol is named DTP (Dynamic Trunking Protocol), inside the CCNA one of the best ways whereby DTP operates is expected.

 

Change(config-if)switchport mode dynamic auto

 

As a CCNA candidate you must know that a port set to DTP (Default on many Cisco Switches) will at all times try to turn into a trunk, periodically the port set to Dynamic Desirable will ship out a DTP body, if it receives a DTP frame in return then at that point the two ports will grow to be trunks.

 

The second method for port setting is called Dynamic Auto, one other subject that as a CCNA student you have to know and experiment with. In contrast to Dynamic Fascinating, the Auto mode is in a passive state and will not problem DTP frames until it receives a DTP frame from an connected port, at which stage the auto mode port will reply with it is personal DTP frame and the 2 ports will then become trunk hyperlinks and carry all VLANs by default.

 

Switch(config-if)switchport mode dynamic auto

 

The third technique which as a CCNA candidate you've got to pay attention to is the extensively most popular methodology and is named simply "Trunk". On this particular mode the port is going to develop into a static trunk regardless how the other finish is set.

 

Switch(config-if)switchport mode trunk

 

When setting a port to "Trunk" many CCNA students consider that DTP is disabled, this is not the case, to disable DTP one must run an distinctive command below the interface prompt, his command is:

 

Swap(config-if)switchport negotiate

 

It's advisable that each one ports connecting switches together are set for static trunking and that DTP is turned off.

 

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