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VTP – VLAN Trunking Protocol

By JMCristobal
febrero 11, 2021
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

By JMCristobal
febrero 8, 2021
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

By JMCristobal
enero 22, 2021
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

By JMCristobal
enero 21, 2021
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

By JMCristobal
enero 18, 2021
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

By JMCristobal
enero 14, 2021
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

By JMCristobal
enero 11, 2021
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

By JMCristobal
enero 7, 2021
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

By JMCristobal
enero 4, 2021
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

By JMCristobal
julio 6, 2017
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

By JMCristobal
junio 27, 2017
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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Enterprise Infrastructure

Habilitar SSH en router Cisco IOS

By JMCristobal
enero 22, 2017
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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