Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Enable trunking from cisco3825 router to cisco 3560 switch

i am relatively new,so i would like to know how to enable trunking from 3825 router to 3560 switch.

If i am missing any details please let me know.

3 REPLIES
Silver

Re: Enable trunking from cisco3825 router to cisco 3560 switch

Hello,

You can create subinterfaces(corresponding to each vlan) on the router's fastethernet port and configure the port (on the switch) attached to this router as trunk port.

Router

---------

int fas 0/0

speed 100

duplex full

int fas 0/0.10

descr VLAN 10 interface

encap dot1q 10

ip address 192.168.10.1 255.255.255.0

int fas 0/0.20

descr VLAN 20 interface

encap dot1q 20

ip address 192.168.20.1 255.255.255.0

int fas 0/0.30

descr VLAN 30 interface

encap dot1q 30

ip address 192.168.30.1 255.255.255.0

On Switch

------------

int fas 0/1

description Connected to Cisco 3845 fas0/0

switchport mode trunk

switchport trunk encap dot1q

HTH

Saju

Pls rate helpful posts

Hall of Fame Super Silver

Re: Enable trunking from cisco3825 router to cisco 3560 switch

Hello Ravishankar,

the trunk is configured on the switch side

on the router side for each Vlan where the router has to be member of you configure a vlan subif.

the same trunking method 802.1Q or ISL must be used on both sides

if using 802.1Q the native vlan (=untagged) must match default is vlan 1 on both.

for the switch side use:

http://www.cisco.com/en/US/products/hw/switches/ps700/products_configuration_example09186a008010f615.shtml

for the router side:

int f0/0

no ip address

int f0/0.10

enc dot1q 10

ip addr 192.168.10.1 255.255.255.0

int f0/0.20

enc dot1q 20

ip addr 192.168.20.1 255.255.255.0

Hope to help

Giuseppe

New Member

Re: Enable trunking from cisco3825 router to cisco 3560 switch

thanks for your quick response and it was very elaborative.

Here is the deal,these two devices(3825 and 3560(24port) are new devices and i have to configure them so they are good to be used for voip.

what are the basic configurations i need on them.

If you can give me step by step,that would be really nice of you.

I have to add a default route on 3825 which would be the ip address of a wan router.

And how would i enable dhcp on both the devices.

Like i mentioned,i am totally new to devices and your help would help me understand at this learning stage.

766
Views
10
Helpful
3
Replies