cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
802
Views
0
Helpful
3
Replies

Trunk Port

ssweehin
Level 1
Level 1

In what condition that we must use trunk port? Normally, trunk port is configured under fastethernet port or gigabitethernet port? I see some people use fastethernet port connect to gigabitethernet port. What is the reason for doing that?

3 Replies 3

bvsnarayana03
Level 5
Level 5

Trunks are used to connect switches when you want hosts on a single vlan spanning across multiple switches to communicate with each other. They can be configured on any ports but duplex, speed, & encapsulation must match on both ends of trunk.

I saw some of them do not use trunk port. They just configure the same vlan name on both of the ethernet port on different switch and use cross cable to connect to each other. why?

Whether can use gigabitethernet port to connect each other for both of the switches?

Not sure why those people were doing that other than they only wanted one vlan trunking across the ports, but then that defeats the whole purpose of trunking huh? Trunking as we know aallows multiple vlans to traverse uplinks (when configured properly). On switch uplinks you want to trunk, thus carry all vlans accross do the following on either interface of the connected switches.

switch#

switch#config t

switch(config)#interface (type/number)

switch(config)#switchport

switch(config)#switchport trunk encap dot1q

switch(config)#switchport mode trunk

switch(config)#ctrl z - to exit

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Innovations in Cisco Full Stack Observability - A new webinar from Cisco