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Troubleshooting Ethernet Problems
271
F I G U R E 5 . 5
Network diagram for Ethernet scenario #2
List Observations
List the observations given you by the user, and then move on to other fact-
gathering procedures:
Large transfer times
Slow throughput
Can ping and traceroute to host
The fact that ping and traceroute work indicates that the routing between
Host A and Host Z is intact. There must be something that causes latency
somewhere along the line. Again, start at the far end of the problem.
The following outputs are several show interface outputs of the same
interface over an extended period of time. Look at them all and see if you can
see the problem.
Router_C#show int ethernet 0/1
Ethernet0/1 is up, line protocol is up
Hardware is Lance, address is 0000.0c47.abea (bia
0000.0c47.abea)
Internet address is 172.16.60.1/24
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/
255, load 46/255
Encapsulation ARPA, loopback not set, keepalive set (10
sec)
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
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