show interface Serial5/1/0.1/1/4/1:16的接口 解析含义

在MSTP接入的Serial接口要冒号（：）后面加数字来表示接口号，如：

PE#show interface Serial5/1/0.1/1/4/1:16

Serial5/1/0.1/1/4/1:16 is up, line protocol is down

Hardware is SPA-1XCHSTM1/OC3

Description: For-VIPcompany 512K-T

Internet address is <ONE IP ADDRESS>/30

MTU 1500 bytes, BW 512 Kbit, DLY 20000 usec, rely 255/255, load 1/255

Encapsulation PPP, crc 16, loopback not set

Keepalive set (10 sec)

LCP Listen

Closed: IPCP

Last input 02:16:20, output 00:00:14, output hang never

Last clearing of "show interface" counters 23:16:24

Queueing strategy: fifo

Output queue 0/40, 5492 drops; input queue 0/75, 0 drops

Available Bandwidth 0 kilobits/sec

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

4822891 packets input, 675325358 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

49 input errors, 15 CRC, 19 frame, 0 overrun, 0 ignored, 15 abort

5008556 packets output, 755034045 bytes, 0 underruns

0 output errors, 0 collisions, 240 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions no alarm present

VC 9: timeslot(s): 9-16, Transmitter delay 0, non-inverted data

PE#

这个“:16”实际上表示的是一个channel-group，看配置可以看出：

controller SONET 5/1/0

description to-DDN-155M-Switch

ais-shut

framing sdh

clock source line

overhead j0 1

aug mapping au-4

!

au-4 1 tug-3 1

mode c-12

idle pattern 0x00

tug-2 1 e1 1 channel-group 0 timeslots 1-31

tug-2 1 e1 1 clock source Line

tug-2 2 e1 1 channel-group 1 timeslots 9-16

tug-2 2 e1 1 channel-group 2 timeslots 17-24

tug-2 2 e1 1 clock source Line

tug-2 2 e1 3 channel-group 2 timeslots 17-20

tug-2 2 e1 3 clock source Line

tug-2 3 e1 1 channel-group 1 timeslots 1-16

tug-2 3 e1 1 clock source Line

tug-2 3 e1 3 channel-group 0 timeslots 1-16

tug-2 3 e1 3 clock source Line

tug-2 4 e1 1 channel-group 0 timeslots 1-8

tug-2 4 e1 1 channel-group 1 timeslots 17-24

tug-2 4 e1 1 channel-group 16 timeslots 9-16

tug-2 4 e1 1 clock source Line

tug-2 4 e1 2 channel-group 1 timeslots 1-2

其中接口标识Serial5/1/0.1/1/4/1:16中“.”之前的表示一个155M的SONET口，“.”之后的1/1/4/1指的是第1个AU4，第1个TUG-3，第4个TUG-2，第1个E1。而最后的“:16”就表示这个E1里面的一个channel-group 16，它包含9-16共8个时隙，故其带宽只有512Kbps。

我们可通过show controllers SONET 5/1/0.1/1/4/1查看整个E1的状态：

GD-SZ-XNT-S-2.CN2#show controllers SONET 5/1/0.1/1/4/1

SONET 5/1/0 is up.

Path mode C12

AU-4 1, TUG-3 1, TUG-2 4, E1 1 (C-12 1/1/4/1) is up

timeslots: 1-24

No alarms detected.

Framing is crc4, Clock Source is Line <--使用成帧方式，有CRC4检验，使用线路时钟而不是内部时钟。

也可以通过show controllers SONET 5/1/0查看整个155M的状态。