Brandon Buffin Fri, 04/04/2008 - 13:47
User Badges:
  • Purple, 4500 points or more

Basically, you need to configure a trunk between these 2 ports. What type of switches?


Brandon

joseph.derrick Fri, 04/04/2008 - 13:58
User Badges:

I would like to connect one of the Catalyst 2980G's port to the port on Catalyst 3750 (uplink).


Are there things that should be taken care of when configuring trunk since the 3750 switch is on production ?

Justin Brenton Fri, 04/04/2008 - 13:59
User Badges:
  • Silver, 250 points or more

Hi Joseph,


Here is how you configure trunking


interface FastEthernet0/1

description Connection to SW1

power inline never

switchport trunk encapsulation dot1q

switchport trunk native vlan 999

switchport trunk allowed vlan 20,25,999

switchport mode trunk

speed 100

duplex full



power inline never - disabled POE on the port

switchport trunk encapsulation dot1q - sets the encapsulation to 802.1q

switchport trunk allowed vlan 20,25,999 - is the vlans allowed to trunk over this port

switchport mode trunk - sets the port to trunking mode.

speed 100 - sets the speed to 100mb, depending on your connection

duplex full - sets the connection to full duplex using a crossover cable.


switchport trunk native vlan 999 - this is a security feature to change the native vlan 1 to native vlan 999 for security reasons. This can be any vlan numbber. This is optional


Hope this helps, please rate.


Cheers,

Justin



Justin Brenton Sun, 04/06/2008 - 09:25
User Badges:
  • Silver, 250 points or more

Hi Joseph,


You have to match the encapsulation, speed, duplex.


Regards,

Justin

Justin Brenton Sun, 04/06/2008 - 09:25
User Badges:
  • Silver, 250 points or more

Hi Joseph,


You have to match the encapsulation, speed, duplex. You probably want to match everything as a good rule of thumb that you can.


Regards,

Justin

joseph.derrick Fri, 04/04/2008 - 14:22
User Badges:

By the way, am I not going to disrupt the service if I do the following configurations ? Or do I need to check on something in the switches ?

joseph.derrick Fri, 04/04/2008 - 16:23
User Badges:

By the way, what if the port that I am connecting my new switch is a member of vlan 10 and I want that all ports of my new switch be a member of vlan 10 also ?

joseph.derrick Fri, 04/04/2008 - 16:54
User Badges:

My concern here is, I have switch A with 24 ports. The 4th port is currently configured to be a member of VLAN 10. Thus, switchport access vlan 10 on its interface configuration.


I wanted to connect another 24 port switch in my network and would want it to connect to Switch A's 4th port because users on the additional switch will also be configured as members of VLAN 10.


How do I go about this ?


Thanks.

Istvan_Rabai Fri, 04/04/2008 - 20:58
User Badges:
  • Gold, 750 points or more

Hi Joseph,


As far as I understand, the 4th port of SwitchA is configured as an access port in vlan10. You must have the "switchport mode access" command also configured.


You can connect SwitchB to the 4th port of SwitchA.


The respective port on SwitchB can be an access port as well, and all the traffic from SwitchB will be carried over to SwitchA, but it will be a vlan10 traffic within SwitchA.


This may be a working config, if you do not plan to have more than 1 vlan on SwitchB, or to implement QoS on the network.


As soon as you have more than 1 vlan on Switch B and Switch A, you will need to configure a trunk between the switches.


Also, for QoS, it is necessary to implement trunks, as the CoS priority field is carried within the trunk encapsulation.


Cheers:

Istvan

Actions

This Discussion