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JMCristobal

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JMCristobal

JMCristobal Posts

STP – Timers, Port Roles and States

By JMCristobal
March 11, 2021
Enterprise Infrastructure
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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STP Overview

By JMCristobal
March 8, 2021
Enterprise Infrastructure
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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Etherchannel PAgP y LACP

By JMCristobal
February 19, 2021
Enterprise Infrastructure
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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Etherchannel Overview

By JMCristobal
February 18, 2021
Enterprise Infrastructure
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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VTP – VLAN Trunking Protocol

By JMCristobal
February 11, 2021
Enterprise Infrastructure
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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DTP – Dynamic Trunking Protocol

By JMCristobal
February 8, 2021
Enterprise Infrastructure
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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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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Basic information about my Fortigate unit

By JMCristobal
September 5, 2017
Basic information about my Fortigate unit
These days, I have had to configure and monitor some Fortigate equipment, most of it is done via GUI, but it is necessary and practical to use the ...
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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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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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