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Optional Configuration Tasks
Command
Step 1
Router# configure terminal
Step 2
Router(config)# interface serial
0/number:channel-group
Step 3
Router(config-if)# crc {16 | 32}
Step 4
Router(config)# exit
Verifying the CRC Size
Use the show interfaces serial command to verify the CRC size set on the interface:
Router#
Serial0/1:0 is up, line protocol is up
Hardware is Multichannel T1
MTU 1500 bytes, BW 1536 Kbit/sec, DLY 20000 usec,
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input 00:00:01, output 00:00:02, 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
Changing a Channel Group Configuration
To alter the configuration of an existing channel group, the channel group needs to be removed first. To
remove an existing channel group, use the following commands:
Cisco ME-3600X-24CX Series Switch Chassis Configuration Guide
2-8
show
interfaces
serial
reliability 255/255, txload 1/255, rxload 1/255
60 packets input, 8197 bytes, 0 no buffer
Received 39 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
64 packets output, 8357 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
1 carrier transitions
Purpose
Enters global configuration mode.
Selects the interface to configure from global
configuration mode.
•
number—Specifies the location of the controller.
The number range for T1 and E1 is 1 to 16.
•
channel-group—Specifies the channel group
number configured on the controller. For example:
interface serial 0/1:1.
Selects the CRC size in bits.
•
16—16-bit CRC. This is the default.
•
32—32-bit CRC.
Note
Moving from CRC 16 to 32 bit (and vice-versa)
is not supported.
Exits configuration mode and returns to the EXEC
command interpreter prompt.
0/1:0
Chapter 2
Configuring T1/E1 Interfaces
OL-27620-01
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