Configuring VLANs and
Trunck Commmunications
This presentation is based on CISCO CCNA materials
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Computer Networking: A Top Down Approach chapter notes, Lecture notes of Computer Networks
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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