Shulou(Shulou.com)06/02 Report--

VLAN

Broadcast: content of specific notice

Broadcast domain: the range that receives the same broadcast

The role of dividing broadcast domains: reducing the number of meaningless broadcasts in the network

Ways to divide broadcast domains: VLAN, routers

1. Function: logically divide broadcast domains

two。 Implementation of VLAN: static VLAN, dynamic VLAN

3. Static VLAN Port ran

1) 0 and 4095: the system comes with it, and users cannot use it or delete it.

2) 1: the switch defaults to VLAN, which can be used by users but cannot be deleted

3) 2-1001: the switch does not exist by default. Users need to create it by themselves, which can be used and deleted.

4) 1002-1005: user token ring can be used by users but cannot be deleted

5) 1006-1024: the system comes with it. Users cannot use it and cannot delete it.

6) 1025-4094: the switch cannot exist by default. Expand VLAN. When 2-1001 is finished, it can be used or deleted.

VLAN creation steps

1) create a VLAN

Switch (config) # vlan vlan-id

2) add the port, and add the designated port to the specified VLAN

Switch (config) # int range fx/x-x / / enter multiple ports continuously

Switch (config-if) # switchport mode access

Switch (config-if) # switchport access vlan vlan-id

3) Verification

Switch# show vlan b / / View VLAN configuration

Note: generally, one network segment and one VLAN per department

Trunk

1.Trunk function: different switches communicate with the same VLAN

2.Trunk marker

1) ISL (Cisco private tag), which can only be used on Cisco devices, takes up a total of 30 bytes

2) IEEE 802.1q (public tag), which applies to all network devices and consumes a total of 4 bytes

Trunk: trunk link for carrying multiple VLAN between switch and switch

Access: access link that carries a VLAN between the switch and the computer

3.Trunk configuration

Switch (config-if) # switchport trunk encapsulation dot1q / / Simulator does not require input

Switch (config-if) # switchport mode trunk

Troubleshooting:

Switch > conf

Translating "conf"... domain server (255.255.255.255)% Name lookup aborted

1) Ctrl+Shift+6

2) Route# sh ip int b / / View router IP configuration

3) Switch# w / / Save the current switch configuration

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