Configuration of the Cisco VLAN

One VLAN (virtual local area network) configuration

To create a VLAN:

J2 (config) #vlan 100

J2 (Config-vlan) #name vlan100

J2 (Config-vlan) #vlan 99

J2 (Config-vlan) #name vlan99

To view VLANs:

J2#sh Vlan-switch

To delete a VLAN:

J2 (config) #no VLAN 99

To add a port to a VLAN:

J2 (config) #int range F1/1-12

J2 (Config-if-range) #switchport mode access

J2 (config-if-range) #switchport Access VLAN 100

View a specific VLAN

J2#show Vlan-switch ID 100

VLAN Name Status Ports

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

vlan100 Active FA1/1, FA1/2, FA1/3, FA1/4

FA1/5, FA1/6, FA1/7, FA1/8

FA1/9, FA1/10, FA1/11, FA1/12

VLAN Type said MTU Parent ringno Bridgeno Stp brdgmode Trans1 Trans2

Second trunk: In a switched network, there are two types of links, the access link (usually belonging to a VLAN, such as the link between the host and the switch) and the trunk link (trunk: Can host multiple VLANs, implementing the same VLAN cross-switch communication)

1 Enter the interface mode and select the package type:

J2 (config) #int range F1/1, F1/3

J2 (config-if-range) #switchport trunk Encapsulation dot1q

2 Configuring the Port as Trunk

J2 (config-if-range) #switchport mode trunk

To add VLANs on the trunk:

J2 (config-if-range) #switchport trunk allowed VLAN add 50

J2 (config-if-range) #switchport trunk allowed VLAN add 60

To remove a VLAN from a trunk:

J2 (config-if-range) #switchport trunk allowed VLAN Remove 50

To view the interface mode:

j2#sh int F1/1 Switchport

Name:fa1/1

Switchport:enabled

Administrative Mode:trunk

Operational Mode:trunk

Administrative Trunking encapsulation:dot1q

Operational Trunking encapsulation:dot1q

Negotiation of trunking:disabled

Access Mode vlan:0 ((Inactive))

Trunking Native Mode vlan:1 (default)

Trunking VLANs enabled:1-49,51-1005

Trunking VLANs active:1,60,100

Priority for untagged frames:0

Override VLAN Tag Priority:false

Voice Vlan:none

Appliance Trust:none

Verify the trunk configuration of the interface:

j2#show int F1/1 Trunk

Port Mode encapsulation Status Native VLAN

FA1/1 on 802.1q trunking 1

Port Vlans allowed on trunk

FA1/1 1-49,51-1005

Port Vlans allowed and active in management domain

FA1/1 1,60,100

Port Vlans in Spanning tree forwarding state and not pruned

FA1/1 1,60,100

Three Ethernet channel configurations:

Premise:

• The ports participating in the bundle belong to one VLAN, or they are all configured as trunk ports

• All ports that participate in the bundle should have the same physical parameters, such as the same rate and duplex mode

Configuration:

J2 (config) #int range F1/3-4

J2 (Config-if-range) #channel-group 1 mode on

J2#sh EtherChannel 1 Summary

Flags:d-Down p-in port-channel

I-stand-alone s-suspended

R-layer3 S-layer2

U-in use

Group Port-channel Ports

-----+------------+-----------------------------------------------------------

1 Po1 (SD) FA1/3 (d) FA1/4 (d)

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Configuration of the Cisco VLAN