CISCO : What You Make Possible

Troubleshooting Link Issues in various CISCO switch

Network Administrator or network engineer will facing with the link issues. This blog will give you direction or how to troubleshoot with using the right command or possible command to tackle the issue.

Link Issue : Port Status and Counters

2900#sh int gig 1/0/1  ( this command will show you the port/interface status.)

GigabitEthernet1/0/1 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet, address is 70ca.9b2d.9f81 (bia 70ca.9b2d.9f81)
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, 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 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec