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Computer Networking: A Top Down Approach chapter notes, Lecture notes of Computer Networks

Computer Networking: A Top Down Approach chapter notes

Typology: Lecture notes

2024/2025

Available from 07/04/2025

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Configuring VLANs and
Trunck Commmunications
This presentation is based on CISCO CCNA materials
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Configuring VLANs and

Trunck Commmunications

This presentation is based on CISCO CCNA materials

VLAN Definitions

One LAN infrastructure,

But multiple VLANs!

Types of VLANs (Cont’d)

VLAN Trunks

Note 1: The links between switches S1 and S2, and S1 and S3 are configured to transmit traffic coming from VLANs 10, 20, 30, and 99 across the network (trunk lines). This network could not function without VLAN trunks! Note 2: Subnets Network Addressees (IPs) and VLAN IDs? IP Space 172.17.0.0/

Tagging Ethernet Frames for VLAN

Identification (Cont’d)

VID 12 bits  4096

Native VLANs and 802.1Q Tagging

  • Control traffic sent on the native VLAN should not be tagged.
  • Frames received untagged, remain untagged and are placed in the native VLAN memory when forwarded. ( Management VLAN to remotely manage all switches configurations)
  • If there are no ports associated to the native VLAN and no other trunk links, an untagged frame is dropped.
  • When configuring a switch port on a Cisco switch, configure devices so that they do not send tagged frames on the native VLAN.
  • In Cisco switches, the native VLAN is VLAN 1, by default (Good practice is disable it by moving all ports to other VLANs and define new Native VLAN).

VLAN Ranges on Catalyst

Switches (Cont’d)

  • Normal Range VLANs

Creating a VLAN

Changing VLAN Port Membership

  • Remove VLAN Assignment  Interface F0/18 was previously assigned to VLAN 20 which is still active, F0/18 reset to VLAN

Verifying VLAN Information

Configuring IEEE 802.1q Trunk

Links

Configuring IEEE 802.1q Trunk

Links (Cont’d)

Thank you

Any question?