How to configure trunk on the sub-interfaces of an Ether switch module installed in a Cisco router
By Brad Reese on Tue, 03/04/08 - 3:14am.
This example shows how to configure the FastEthernet port on an 1841 router as a trunking interface.
The Cisco 1841 router has two onboard FastEthernet autosensing interfaces that support 10- or 100-Mbps connections.
The sub interface becomes fa 0/x..
For instance, fa 0/1.2 represents the sub-interface for VLAN 2.
In addition, it is necessary to define the encapsulation as encapsulation dot1q vlan-id.
| Hostname(config)#interface FastEthernet0/1 Hostname(config-if)#no ip address |
| Hostname(config-if)#no shutdown |
| Hostname(config)#interface FastEthernet0/1.1 Hostname(config-if)#encapsulation dot1Q 1 native Hostname(config-if)#ip address x.x.y.y < subnet mask > |
| interface FastEthernet0/1.2 Hostname(config-if)#encapsulation dot1Q 2 Hostname(config-if)#ip address x.x.y.y < subnet mask > |
Note:
There is no way to setup the 1841 router to negotiate the trunk.
| Cisco Subnet |
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