09-08-2008 08:35 AM - edited 03-06-2019 01:14 AM
Hello:
I have a 1841 router. I need to support 6 VLAN's. My plan is to use 2960 switches connected to the 1841 and configure the Ethernet port as a trunk port. I have searched but have not found anything on this type of config. Does anyone have any pointers or advice on the config?
09-08-2008 08:47 AM
1) Create your 6 vlans on 2960 switch eg
2960(config)# vlan 10
2960(config-vlan)# name v10
2960(config)# vlan 11
2960(config-vlan)# name v11
etc. for each vlan
2) On the port that connects the 2960 to your 1841 router
int fa0/1
switchport mode trunk
(no need to specify encapsulation as 2960 only supports 802.1q
3) On 1841
int fa0/0.10
encapsulation dot1q 10
ip address 192.168.5.1 255.255.255.0
int fa0/0.11
encapsulation dot1q 11
ip address 192.168.6.1 255.255.255.0
etc.. for each vlan.
Note that the interface number does not have to match the vlan number but the encapsulation dot1q
Jon
09-08-2008 08:49 AM
Hello Harrison,
if your 1841 hasn't an etherswitch module, you can use the old approach:
switch side: layer 2 trunk port with 6 vlans permitted using 802.1Q
router side: a FE/Ge port with:
no ip address on main interface
int fa0/0.30
encapsulation dot1q 30
ip address x.x.x.x 255.255.255.0
define 6 subinterfaces, the parameter in the enc dot1q command must match the desired vlan-id.
if you have an etherswitch module on the 1841 you can :
define the 6 vlans on the etherswitch
define 6 SVI interfaces associated to the 6 vlans (remenber the no shut)
define a l2 trunk for each 2960 carrying the 6 vlans
use this config guide as a reference
http://www.cisco.com/en/US/docs/ios/lanswitch/configuration/guide/12_4/lsw_12_4_bk.html
Hope to help
Giuseppe
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