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Chapter 7

Troubleshooting Serial Line and Frame Relay Connectivity

The third line shows the Layer 3 IP address with the associated subnet mask:

Internet address is 172.16.30.5/30

Line 4 contains all of the information needed to create a route metric

for the interface. The data includes MTU, bandwidth, delay, reliability,
and load.

MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/

255, load 51/255

Line 5 indicates the type of encapsulation that is being used on the line, as

well as loopback and keepalive information:

Encapsulation HDLC, loopback not set, keepalive set (10

sec)

The sixth line displays the last time the interface saw any traffic:

Last input 00:00:00, output 00:00:00, output hang never

Again, the seventh line shows the time that transpired since the last time

the interface counters were cleared:

Last clearing of "show interface" counters 00:28:48

Lines 8 through 12 contain information regarding the buffers on the interface:

Input queue: 1/75/0 (size/max/drops);

Total output drops: 0

Queueing strategy: weighted fair

Output queue: 0/1000/64/0 (size/max total/threshold/

drops)

Conversations 0/2/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Lines 13 and 14 display the five-minute average for input and output bits

per second, and packets per second on the interface:

5 minute input rate 321000 bits/sec, 48 packets/sec

5 minute output rate 320000 bits/sec, 48 packets/sec

Beginning with line 15 and until line 17, the output displays interface

input information. The first line is a counter that keeps track of the number

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