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Troubleshooting Token Ring Problems
285
Internet address is 172.16.30.1, subnet mask is
255.255.255.0
MTU 4464 bytes, BW 16000 Kbit, DLY 630 usec, rely 255/
255, load 1/255
Encapsulation SNAP, loopback not set, keepalive set (10
sec)
ARP type: SNAP, ARP Timeout 04:00:00
Ring speed: 16 Mbps
Single ring node, Source Route Transparent Bridge
capable
Ethernet Transit OUI: 0x000000
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored,
0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped
out
5 transitions
The fact that the physical interface is down indicates a Layer 1 or Layer 2 prob-
lem. The line protocol indicates a Layer 2 or Layer 3 problem. In this case, if there
is a Physical layer problem, the upper layers do not work. Troubleshooting the
upper layers is a waste of time until the lower layer problems are resolved.
Propose Solutions
The principal observation is that there is a physical problem with the inter-
face. Review the Token Ring architecture so you can create an action plan.
Figure 5.8 depicts the manner in which a station connects via Token Ring.
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