Enterprise Infrastructure

Enterprise Infrastructure

Enterprise Infrastructure

STP – Timers, Port Roles and States

Choosing root ports Once the root bridge is chosen, a Root Port must be chosen for each switch, which is not the root bridge. The root port always ...
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Enterprise Infrastructure

STP Overview

Spanning-Tree Protocol can exist between two devices (switches). Multiple active paths between devices cause loops in the network. STP is a layer 2 link management protocol that provides ...
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Enterprise Infrastructure

Etherchannel PAgP y LACP

The audio of the video is only in Spanish EtherChannels can be negotiated between two switches; there are two protocols for this negotiation: PAgP and LACP. PAgP (Port ...
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Enterprise Infrastructure

Etherchannel Overview

Etherchannel, also known as Link Aggregation, is a technology that allows grouping several physical interfaces that connect a pair of devices; when the etherchannel is established, the devices ...
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Enterprise Infrastructure

VTP – VLAN Trunking Protocol

VTP uses Layer 2 trunk links to communicate VLAN information within a group of switches. VTP manages the addition, deletion, and renaming of vlan names by sending VTP ...
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Enterprise Infrastructure

DTP – Dynamic Trunking Protocol

DTP is cisco’s proprietary protocol for negotiating trunking mode between two switches. A trunk link can only be negotiated between two switches if both belong to the same ...
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Enterprise Infrastructure

VLANs y Trunk Ports

The video is in Spanish only Trunk ports can carry two or more VLANs over a single switch port and are helpful when switches are connected to other ...
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Enterprise Infrastructure

VLANs y Access Port

The video is in Spanish only Virtual LAN – VLAN A VLAN defines a broadcast domain; they help us to create logical networks within the same switch with ...
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Enterprise Infrastructure

UDLD – UniDirectional Link Detection

UDLD is a Cisco proprietary Layer 2 protocol that monitors the state of a port to validate bidirectional communication. Recall that each port in a switch is bidirectional, ...
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Enterprise Infrastructure

LLDP – Link Layer Discovery Protocol

LLDP is similar to the CDP protocol but is based on the IEEE 802.1ab standard. The great advantage of LLDP is that it works on multi-vendor networks. Information ...
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Enterprise Infrastructure

CDP – Cisco Discovery Protocol

CDP is a Cisco proprietary protocol used to collect information from devices on the network that is directly connected, such as hardware, software, device name and more. CDP, ...
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Enterprise Infrastructure

Errdisable recovery

Switches can automatically detect error conditions on each of their ports. When an error is detected, the switch puts the port in “errdisable” state and is disabled. This ...
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Enterprise Infrastructure

Managing MAC Addres Table

Switches operate at layer 2 of the OSI model (Data Link). It sends frames based on destination MAC addresses (Media Access Control) found within the same frame based ...
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Enterprise Infrastructure

Macro switchport host – Cisco IOS

A few days ago, when I was configuring the ports of a switch and reviewing the operation of STP, I found in the CLI the command “switchport host”, ...
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Enterprise Infrastructure

Comando “Default interface” – Cisco IOS

The “default interface” command is used to return an interface to its default configuration; its implementation is in global configuration mode, and the interface to be modified is ...
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