los hubs explicación
TRANSCRIPT
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HUB
Generalidades
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HUB
Son dispositivos de capa1
Sólo regeneran la señal
Y la envían mediante broadcast a todos los puertos
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HUB
Es un dispositivo de Networking
Networking significa interconexión de estaciones de trabajo, periféricos, terminales y otros dispositivos
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HUB
Características
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HUB
Llamado también ConcentradorRepresenta el centro de red en
topología estrellaSiendo el Puerto la interfaz de un
dispositivo de red:Es un Repetidor Multipuerto
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HUB
Funciones
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HUB
Amplifica las señalesLas propaga por la redNo filtraNo determina o conmuta rutasSe lo utiliza como punto de
concentración de la red
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HUB
Una Clasificación
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HUB
ActivosRepiten señales enviadas a través de
ellos
PasivosNo repiten, sino que meramente dividen
las señales enviadas a través de ellos.
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HUB
Otra Clasificación
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HUB
InteligentesTienen puertos de consolaSe pueden programar para
administrar el tráfico de la red
No inteligentesSin capacidad de realizar ninguna
administración
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HUB
Aplicaciones
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Aplicacoines
Con el propósito de aumentar el número de puertos, pueden conectarse
en cascada (hubs autónomos)
en pila (hubs conectables en pila)
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Autónomos o en pila?
AutónomosPequeños grupos de trabajo4 ó 5 puertos
En pilaPermiten expansión modular
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HUBS CISCO
Algunos modelos
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Cisco 1538 Series — Micro Hubs 10/100
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Table 13-4: Physical and Environmental Specifications for Cisco 1538 Series
Description Specification
Dimensions (H xW x D)
3.1 x 11.2 x 8.7 in. (7.85 x 28.4 x 22.1 cm); heightincludes stacking curves on top of switch
Weight 3.0 lb (1.4 kg)
Operatingtemperature
32 to 104°F (0 to 40°C)
Operatinghumidity
10 to 85% noncondensing
Operatingaltitude
up to 9840 ft (3000 m)
Storagetemperature
-40 to 149°F (-25 to 65°C)
Storage altitude 30,000 ft (9146 m)
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Stack Cisco Micro Hubs to Create Larger Managed Networks
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Connect Up to Eight Workstations to the Cisco Micro Hub
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Modos de configuración
Existen dos:
guest mode
administrator mode (also called privileged mode). The commands available in guest mode are a subset of those available in administrator mode.
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Pasaje entre modos
Qué comando escribimos:
Hub> Hub> enable
Password: ******
Hub#
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Comandos de Configuración
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Syntax: show hub information [hub id]
Hub> show hub informationHub ID Type H/W ver F/W ver SNMP-Agent-----------------------------------------1 1503 1.0 1.01 Yes2 1502 1.0 1.01 No3 1503 1.0 1.01 No
Command Display Definitions Hub ID--Number used to identify the hub in a stack. An
integer between 1 and 5. Read the section "Hub IDNumbers" earlier in this chapter for information abouthow to determine hub ID numbers.
Type--Model number of the hub: 1502 or 1503.
H/W ver--Hub's hardware version.
F/W ver--Hub's firmware version.
Agent--Whether or not the hub contains an active SNMP agent.
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Comandos estadísticos
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Syntax: show system statistics Hub> show system statisticsFrames : 9755Bytes : 78040Collisions : 671Alignment errors : 45CRC errors : 33Total errors : 867
Command Display Definitions Frames--Number of frames (packets) passing through the
hub.
Bytes--Number of bytes passing through the hub.
Collisions--Number of times that network devices attached to any one of the hubs inthe stack have attempted to send data simultaneously.
Alignment errors--Number of mis-synchronized data packets.
CRC errors--Number of cyclic redundancy check (CRC) errors.
Total errors--Total number of errors of the following types: frame control sequence,alignment, frames-too-long, short events, late events, jabber, and data rate mismatches
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Syntax: show hub statistics [hub id] Hub> show hub statistics 1 Alignment CRC TotalHub ID Frames Bytes Collisions Errors Errors Errors--------------------------------------------------------------1 1039 29354 264 23 12 486
Command Display Definitions Hub ID--Position of the hub in the stack, from top to
bottom.
Frames--Number of frames (packets) passing through the hub.
Bytes--Number of bytes passing through the hub.
Collisions--Number of times that network devices attached to any one of the hubs inthe stack have attempted to send data simultaneously.
Alignment errors--Number of mis-synchronized data packets.
CRC errors--Number of CRC errors.
Total errors--Total number of errors, including the following types: frame control sequence,alignment, frames-too-long, short events, late events, jabber, and data rate mismatches.