Comando Cisco IOS para Verificar Status de Interface: show interfaces

Verificando Status de Interface em Roteadores/Switches Cisco

O comando principal é show interfaces (ou show interface).

Variações de Sintaxe

 show interfaces ! Todas as interfaces detalhadas show interfaces [tipo número] ! Específica: show interfaces GigabitEthernet0/1 show interfaces status ! Tabela resumo (switches) show interfaces description ! Descrição + status + protocolo show interfaces accounting ! Contadores de pacotes/bytes show interfaces counters errors ! Apenas contadores de erro show interfaces [tipo número] brief ! Resumo em uma linha 

Principais Campos da Saída

• Line Protocol: up (Data Link OK) / down (sem keepalives, sem clock).
• Interface: up (Admin up, hardware OK) / down (shutdown) / administratively down.
• Hardware: Tipo, MAC, MTU, BW, Delay, Reliability, Load, Encapsulation.
• Internet Address: IP/máscara.
• Contadores: Pacotes/bytes entrada/saída, drops, erros (CRC, frame, overrun, ignored), colisões, resets.
• Queueing: Fila de saída, drops, conversas.
• Taxa: Taxa de entrada/saída 5-min (bits/sec, pacotes/sec).

Exemplo de Saída (GigabitEthernet0/1)

 GigabitEthernet0/1 is up, line protocol is up Hardware is CSR vNIC, address is 0050.568e.1234 (bia 0050.568e.1234) Internet address is 192.168.1.1/24 MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full Duplex, 1000Mbps, media type is RJ45 input flow-control is off, output flow-control off ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:00, output 00:00:00, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 1000 bits/sec, 2 packets/sec 5 minute output rate 2000 bits/sec, 3 packets/sec 1500 packets input, 120000 bytes, 0 no buffer Received 1000 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 0 multicast, 0 pause input 1800 packets output, 150000 bytes, 0 underruns 0 output errors, 0 collisions, 1 interface resets 0 unknown protocol drops 0 output buffer failures, 0 output buffers swapped out 

Verificação Rápida de Saúde

• show interfaces | include (up|down|errors|rate)
• show interfaces status (switches): Porta, Nome, Status, Vlan, Duplex, Speed, Tipo.

Essencial para troubleshooting de conectividade, performance, erros e planejamento de capacidade.

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