CCNA Course IV

Vlan Base:

The role of VLANs: Put physically segmented users, and let them logically together.

Vlan Range: 0-4095

0 4095 is reserved and cannot be used

1 Cisco Credit VLAN

Standard VLAN 1-1005

Extended VLAN 1006-4094 is established and deleted only in global configuration command mode. Will not be transferred by VTP except for VTP v3

Vlan Establishment of:

The effect is the same in both ways:

First:

switch#

Switch#vlan database//Enter VLAN database mode

Switch (VLAN) #vlan 2 name vlan2//Build VLAN 2 named "vlan2" name is only locally valid

VLAN 2 added:

Name:vlan2

Switch (VLAN) #vlan 3 name Vlan3

VLAN 3 added:

Name:vlan3

Switch (VLAN) #exit

APPLY completed.

Exiting ....

switch#

Second:

Switch (config) #

Switch (config) #vlan 2//Build VLAN in global command mode 2

Switch (Config-vlan) #name vlan2//named "Vlan2" is valid locally

Switch (Config-vlan) #exi

Switch (config) #

interface Join VLAN (Make VLAN function):

Switch (config) #int F0/1

Switch (CONFIG-IF) #switchport mode access//Make switch interface mode into Access mode

Switch (config-if) #switchport access VLAN 2//Add interface to VLAN 2

Switch (config-if) #exit

One interface can only join one VLAN

Configuration Summary for VLANs:

1. Building VLANs
2. Interface joins VLAN

To view VLAN information: Show VLAN Brief

Trunk

Trunks are links that are used to transmit multiple VLAN information.

Trunk Package Standard:

1. Dot1q public, is to insert information (VLAN number) in the data frame
2. ISL Cisco Private, which is the encapsulation of the data frame

Trunk Configuration

Switch (config) #int F0/1

Switch (config-if) #switchport trunk Encapsulation dot1q//trunk package for dot1q standard

Switch (config-if) #switchport mode trunk//interface mode for trunk

DTP (Trunk transport protocol, used to dynamically negotiate a trunk):

One end configuration: The other end is configured

Mode trunk trunk,auto.desirable link can Chilai into trunk

Mode dynamic Auto Trunk,desirable link can Chilai into trunk

mode dynamic desirable trunk,auto,desirable link can Chilai into trunk

Link needs to be trunk, but DTP is turned off

Switch (config-if) #switchport mode trunk

Switch (config-if) #switchport nonegotiate

Configuration steps for VLAN under LAN:

1. Trunk between switches

2. All switches establish the same VLAN, (VTP)

3. Each switch strokes the interface into the appropriate VLAN

4. Configuring Layer 3 Information (IP)

Vtp

VTP is used to unify the creation and deletion of VLAN information.

VTP3 mode:

Server: Can add, remove VLANs, learn VLAN information, transmit VLAN information to other people

Client: Can not add, delete VLAN, can learn VLAN information from server, pass the learning information to others

Transparent: You can only add and delete your own VLAN information. Do not learn VLAN information from server, can pass VLAN information learned from server to other people

VTP configuration:

Link between switches requires trunk configuration

Switch#vlan Database

Switch (VLAN) #vtp domain CCNA//Set VTP for a device under the same domain name to learn

Switch (VLAN) #vtp server//Set VTP mode to server

Device mode already VTP SERVER.

Switch (VLAN) #exit

APPLY completed.

Exiting ....

Or

Switch (config) #vtp domain CCNA

Switch (config) #vtp mode server

Single-Arm routing configuration:

1. Switch-to-router link, switch-side trunk

2. Router-side:

int f0/0

No IP Add//physical port does not configure IP address

No sh

Exit

int f0/0.1//Establish sub-interface, 1 to connect the opening mark

En do 2//traffic that hosts VLAN 2

IP Add xx.xx.xx.xx

Exit

int f0/0.x//can establish multiple sub-interfaces

The 3.PC terminal needs to configure the gateway, the gateway address is

The IP address of the VLAN sub-interface where you are located

Stp

Role:

1. Make a physically ring topology so that it is logically non-circular.

2. Dynamic Backup

STP communicates through BPDUs which interface is chosen by block.

STP Standard:

802.1D Standard STP CSTP convergence time 50s

802.1W Fast STP RSTP to complete convergence in 1s

802.1s Multi-instance STP MSTP

CISCO:PVSTP each VLAN has its own one STP

Ssh

Configuration by SSH Manager:

R1 (config) #username aa password AA//Set user name and password for administrator login

R1 (config) #hostname R1

R1 (config) #ip domain name ccxx.com

R1 (config) #crypto key generate RSA//Open SSH generate key

R1 (config) #line vty 0 4//Open vty Line

R1 (config-line) #login Local//Login method

R1 (Config-line) #end

Landed by:

R2#ssh–l AA 1.1.1.1//R2 ssh using username "AA" Login 1.1.1.1

CCNA Course IV