• Basic Vlan Configure


    Basic Vlan CLI Configure

     

    Switch>en

    Switch#conf t

    Enter configuration commands, one per line.  End with CNTL/Z.

    Switch(config)#vlan 10

    Switch(config-vlan)#name hello

    Switch(config-vlan)#exit

    Switch(config)#int range fastethernet0/1-10

    Switch(config-if-range)#switchport access vlan 10

    Switch(config-if-range)#end

    Switch#

    %SYS-5-CONFIG_I: Configured from console by console

    Switch#

    Switch#conf t

    Enter configuration commands, one per line.  End with CNTL/Z.

    Switch(config)#int range fastethernet0/11-20

    Switch(config-if-range)#switchport access vlan 3

    % Access VLAN does not exist. Creating vlan 3

    Switch(config-if-range)#end

    Switch#

    %SYS-5-CONFIG_I: Configured from console by console

    Switch#show vlan brief

    VLAN Name                             Status    Ports

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

    1    default                          active    Fa0/21, Fa0/22, Fa0/23, Fa0/24

                                                    Gig1/1, Gig1/2

    3    VLAN0003                         active    Fa0/11, Fa0/12, Fa0/13, Fa0/14

                                                    Fa0/15, Fa0/16, Fa0/17, Fa0/18

                                                    Fa0/19, Fa0/20

    10   hello                            active    Fa0/1, Fa0/2, Fa0/3, Fa0/4

                                                    Fa0/5, Fa0/6, Fa0/7, Fa0/8

                                                    Fa0/9, Fa0/10

    1002 fddi-default                     active   

    1003 token-ring-default               active   

    1004 fddinet-default                  active   

    1005 trnet-default                    active   

    Switch#

    Vlan Trunking Configuration

    DTP: consider the type of trunking. Cisco switches that support ISL and 802.1Q can negotiate which type to use, using the Dynamic Trunking Protocol (DTP). If both switches support both protocols, they use ISL; otherwise, they use the protocol that both support. Today, many Cisco switches do not support the older ISL trunking protocol.

    DTP can also negotiate whether the two devices on the link agree to trunk at all, as guided by the local switch port’s administrative mode. The administrative mode refers to the configuration setting for whether trunking should be used. Each interface also has an operational mode, which refers to what is currently happening on the interface, and might have been chosen by DTP’s negotiation with the other device. Cisco switches use the switchport mode interface subcommand to define the

    administrative trunking mode

     

    Trunking Administrative Mode Options with the switchport mode Command

     

     

    Expected Trunking Operational Mode Based on the Configured Administrative Modes

    Cisco recommends disabling trunk negotiation on most ports for better security. The majority of switch ports on most switches will be used to connect to users. As a matter of habit, you can disable DTP negotiations altogether using the switchport nonegotiate interface subcommand.

    Controlling Which VLANs Can Be Supported on a Trunk

    The allowed VLAN list feature provides a mechanism for engineers to administratively disable a VLAN from a trunk. By default, switches include all possible VLANs (1–4094) in each trunk’s allowed VLAN list. However, the engineer can then limit the VLANs allowed on the trunk by using the following interface subcommand:

    switchport trunk allowed vlan {add | all | except | remove} vlan-list

    This command provides a way to easily add and remove VLANs from the list. For example, the add option permits the switch to add VLANs to the existing allowed VLAN list, and the remove option permits the switch to remove VLANs from the existing list. The all option means all VLANs, so you can use it to reset the switch to its original default setting (permitting VLANs 1–4094 on the trunk). The except option is rather tricky: It adds all VLANs to the list that are not part of the command. For example, the switchport trunk allowed vlan except 100-200 interface subcommand adds VLANs 1 through 99 and 201 through 4094 to the existing allowed VLAN list on that trunk.

    switches do not forward frames in nonexistent VLANs or a shutdown VLAN over any of the switch’s trunks.

    Mind Map

     

    Practice

     

    Switch 0:

    Switch(config)#int gigabit1/1

    Switch(config-if)#switchport mode trunk

    Switch(config-if)#

    %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/1, changed state to down

    %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/1, changed state to up

    Switch#show interface gigabit1/1 switchport

    Name: Gig1/1

    Switchport: Enabled

    Administrative Mode: trunk

    Operational Mode: trunk

    Administrative Trunking Encapsulation: dot1q

    Operational Trunking Encapsulation: dot1q

    Negotiation of Trunking: On

    Access Mode VLAN: 1 (default)

    Trunking Native Mode VLAN: 1 (default)

    Voice VLAN: none

    Administrative private-vlan host-association: none

    Administrative private-vlan mapping: none

    Administrative private-vlan trunk native VLAN: none

    Administrative private-vlan trunk encapsulation: dot1q

    Administrative private-vlan trunk normal VLANs: none

    Administrative private-vlan trunk private VLANs: none

    Operational private-vlan: none

    Trunking VLANs Enabled: ALL

    Pruning VLANs Enabled: 2-1001

    Capture Mode Disabled

    Capture VLANs Allowed: ALL

    Protected: false

    Appliance trust: none

    Switch#

    Switch 1:

    Switch#show interface gigabit1/2 switchport

    Name: Gig1/2

    Switchport: Enabled

    Administrative Mode: dynamic auto

    Operational Mode: trunk

    Administrative Trunking Encapsulation: dot1q

    Operational Trunking Encapsulation: dot1q

    Negotiation of Trunking: On

    Access Mode VLAN: 1 (default)

    Trunking Native Mode VLAN: 1 (default)

    Voice VLAN: none

    Administrative private-vlan host-association: none

    Administrative private-vlan mapping: none

    Administrative private-vlan trunk native VLAN: none

    Administrative private-vlan trunk encapsulation: dot1q

    Administrative private-vlan trunk normal VLANs: none

    Administrative private-vlan trunk private VLANs: none

    Operational private-vlan: none

    Trunking VLANs Enabled: ALL

    Pruning VLANs Enabled: 2-1001

    Capture Mode Disabled

    Capture VLANs Allowed: ALL

    Protected: false

    Appliance trust: none

    Switch#

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  • 原文地址:https://www.cnblogs.com/zhnhelloworld/p/3696660.html
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