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Chapter 2
Configuring T1/E1 Interfaces
Verifying Interface Configuration
Use the show interfaces serial command to verify the CRC size set on the interface:
Router# show running-config interfaces serial 0/1:0
Building configuration...
Current configuration : 64 bytes
!
interface Serial0/1:0
ip address 209.165.200.225 255.255.255.224
end
Router# show interfaces serial 0/1:0
Serial0/1:0 is up, line protocol is up
Hardware is Multichannel T1
Internet address is 209.165.200.225/24
MTU 1500 bytes, BW 1536 Kbit/sec, DLY 20000 usec,
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input 00:00:06, output 00:00:09, output hang never
Last clearing of "show interface" counters 00:40:04
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
Optional Configuration Tasks
There are several standard, but optional, configuration tasks that might be necessary to complete the
configuration of your serial interface.
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Configuring Framing
Framing is used to synchronize data transmission on the line. Framing allows the hardware to determine
when each packet starts and ends. To configure framing, use the following commands.
OL-27620-01
reliability 255/255, txload 1/255, rxload 1/255
289 packets input, 21249 bytes, 0 no buffer
Received 240 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
304 packets output, 26439 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
Configuring Framing, page 2-5
Configuring Encapsulation, page 2-6
Configuring the CRC Size for T1 Interfaces, page 2-7
Changing a Channel Group Configuration, page 2-8
Cisco ME-3600X-24CX Series Switch Chassis Configuration Guide
Optional Configuration Tasks
2-5
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