Tag Archives: vlan

VLAN Trunking Protocol

This is a Cisco proprietary protocol that is designed to ease Vlan database management, it has nothing to do with trunking. The concept is that a switch with a VTP server mode will propagate VLAN database down to all switches … Continue reading

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Catalyst Switch: Turn off trunking negotiation

To turn off dynamic trunking protocol (DTP) and use dot1q standard. It is recommended to turn off trunking protocol and put vtp to transparent mode, this is because a newly introduced Catalyst switch may form undesired switch topology and if … Continue reading

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Catalyst Switch: No trunks is formed

I have connected two Cisco Catalyst 3560 switches together by a pair of fibre cables. No trunk was formed. The default interface configuration for Catalyst 3560 is dynamic auto, in Catalyst 3550 the default was dynamic desirable. Dynamic desirable is … Continue reading

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Centilin technologies training video

   

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Security: Private vlan example

Private vlan 1. Before you start make sure the vtp mode is set to transparent. 2. The difference between private vlan and protected port is protected port is localized within the switch itself, but private vlan can propagate among switches. … Continue reading

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VACL: Restricting access using Vlan ACL.

VACL: Restricting access using Vlan ACL. by Cyrus Lok on Tuesday, June 8, 2010 at 11:28pm Create a list of traffic that you want to restrict the vlan to access, in this example I want to restrict vlan 30 and … Continue reading

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Number of vlans that can be created for each cisco switch models

Number of vlans that can be created for each cisco switch models by Cyrus Lok on Monday, August 9, 2010 at 11:45pm 2950: standard ios supports up to 64 vlans, able to use vlan id from 1 – 4094. Enhanced … Continue reading

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