Excessive interference with these communication processes could result in degraded conditions or interruptions to the normal flow of user data.īecause of the importance of control protocol communications, VLAN 1 should not be used for user data traffic, but instead reserved for the control protocols. The control protocols mentioned above are critical to the normal operation of a switched network. All these inter-switch protocols use VLAN 1 to communicate vital switching information throughout the network. It is used for several switch control protocols, including VLAN Trunking Protocol (VTP), Port Aggregation Protocol (PAgP), Cisco Discovery Protocol (CDP), and Spanning Tree Protocol (STP). VLAN 1 carries special significance in a Cisco switching environment. The section also establishes the Organization’s standards for configuring a switch to be administered remotely. This section discusses significance VLAN 1 and its relevance to switch control protocols used in switched network environment. Switched networks employ several control protocols that work to ensure the smooth flow of user data across the network.
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