Configurging VLAN Taggging on a Cisco 2801 Router for 10Mbps Internet Circuit

Posted on 2012-04-10
Last Modified: 2012-04-12
I am activating a new 10Mbps Internet Circuit to replace a T1.  The ISP has provided me my WAN IP, GATEWAY, and a /28 Routable IP Block.  They told me there is VLAN tagging on this circuit, so I'll need to configure my equipment to support the VLAN ID of (10).  Can anyone show me how to configure VLAN Tagging?  I have everything else configured.  Thanks.
Question by:denver218
  • 2
LVL 10

Expert Comment

ID: 37827185
When VLANs span multiple switches, VLAN Tagging is required. A VLAN is a method of creating independent logical networks within a physical network. VLAN Tagging is the practice of inserting a VLAN ID into a packet header in order to identify which VLAN (Virtual Local Area Network) the packet belongs to. More specifically, switches use the VLAN ID to determine
which port(s), or interface(s), to send a broadcast packet to. VLAN Tagging support allows administrators to deploy ProxySG appliances inline with switches that are routing VLAN traffic without the risk of losing VLAN ID information.

To configure VLan tagging in Cisco

Author Comment

ID: 37827249
Could you provide an example:  Below is the relevant part of my configurations showing how the interfaces are configured:

interface GigabitEthernet0/0
 description WAN_IP
 ip address x.x.138.97
 duplex auto
 speed auto
interface GigabitEthernet0/1
 ip address x.x.143.129
 ip flow ingress
 ip nat outside
 ip virtual-reassembly
 duplex auto
 speed auto
interface FastEthernet0/2/0
 ip address
 duplex auto
 speed auto

If the ISP needs me configuremy equipment to support the VLAN ID of (10) to connect to the 10Mbps circuit under what interface to I configure this and how?  Thanks.
LVL 15

Accepted Solution

Nayyar HH (CCIE RS) earned 500 total points
ID: 37827308
Try config below - I presume g0/1 is facing the service provider

conf t

default interface g0/1

interface g0/1
duplex full
speed 10

interface GigabitEthernet0/1.10
encapsulation dot1q 10
 ip address x.x.143.129
 ip flow ingress
 ip nat outside
 ip virtual-reassembly


wr mem

Remember to backup config prior to progressing

Author Closing Comment

ID: 37839759

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