VLANs

VLANs concept is very well known to separate network traffic on single switch to increase security. This allows more clearer network design minimizing needs for an additional hardware to deployed. The below example has been tested on Cisco 1900 series router eqquipped with EHWIC-4ESG-P EtherSwitch card. This configuration supports up to 16 VLANs but higher end devices can support up to 4096 VLANs. Please refer to your device documentation for more details.

Create

#vlan vlan_id

Deleting a VLAN

#no vlan vlan_id

Show all VLANs summary and port assignment

r1-basic#sh vlan-switch

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Gi0/1/0, Gi0/1/1, Gi0/1/2
                                                Gi0/1/3
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup

VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1    enet  100001     1500  -      -      -        -    -        1002   1003
1002 fddi  101002     1500  -      -      -        -    -        1      1003
1003 tr    101003     1500  1005   0      -        -    srb      1      1002
1004 fdnet 101004     1500  -      -      1        ibm  -        0      0
1005 trnet 101005     1500  -      -      1        ibm  -        0      0

Verify trunk interfaces

r1-basic#show interfaces trunk

Access port configuration

interface GigabitEthernet1/0/2
description Access Port to Cisco Access Point
switchport access vlan 10
no ip address
end

interface range

interface range gi 0/1/0 - 3

Trunk port configuration in this example 802.1Q encapsulation is used

interface GigabitEthernet1/0/1
description Trunk Port to Cisco WLC
switchport trunk encapsulation dot1q
switchport trunk native vlan 99
switchport trunk allowed vlan add 10,20,99
switchport mode trunk
switchport nonegotiate
no shutdown