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VLANs y Trunk Ports

By JMCristobal
January 22, 2021
Enterprise Infrastructure
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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VLANs y Access Port

By JMCristobal
January 21, 2021
Enterprise Infrastructure
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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UDLD – UniDirectional Link Detection

By JMCristobal
January 18, 2021
Enterprise Infrastructure
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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LLDP – Link Layer Discovery Protocol

By JMCristobal
January 14, 2021
Enterprise Infrastructure
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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CDP – Cisco Discovery Protocol

By JMCristobal
January 11, 2021
Enterprise Infrastructure
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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Errdisable recovery

By JMCristobal
January 7, 2021
Enterprise Infrastructure
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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Managing MAC Addres Table

By JMCristobal
January 4, 2021
Enterprise Infrastructure
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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Macro switchport host – Cisco IOS

By JMCristobal
July 6, 2017
Enterprise Infrastructure
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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“Default interface” command – Cisco IOS

By JMCristobal
June 27, 2017
Enterprise Infrastructure
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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Enable SSH in Cisco IOS router

By JMCristobal
January 22, 2017
Enterprise Infrastructure
Telnet is a protocol that does not use encryption, where everything that passes through it is displayed in plain text; for security reasons, the SSH (Secure Shell) protocol ...
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This website is free and educational. Contains my thoughts and ideas, which may not represent the thoughts of the various technologies mentioned here. All product names, logos, and illustrations are copyright/trademarks of their respective owners.
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