channel-set 0 timeslot-list 1
frame-format crc4
clock master
#
return
Check whether physical attributes of the local and remote controller interfaces are the same. For
example, check whether their frame formats are both CRC4, whether their encoding and
decoding modes are both HDB3, whether both of them are configured not to invert data, and
whether their timeslots bound to form a channel are the same. In addition, check whether the
two controller interfaces are configured to work in master clock mode and slave clock mode
respectively.
l If the two controller interfaces have different configurations or frequently alternate between
Up and Down states, reconfigure the two interfaces.
l If the two controller interfaces have the same configurations and remain Up, go to step 2.
Step 2 Check that the local and remote serial interfaces have the same configurations.
Run the display this command in the serial interface view to check the serial interface
configuration.
[Huawei-E1 1/0/0]int serial
1/0/0:0
[Huawei-Serial1/0/0:0]display
this
[V200R001C00B000]
#
interface Serial1/0/0:0
link-protocol ppp
timer hold 0
ip address 1.1.1.2 255.255.255.0
#
return
Check whether the two serial interfaces have the same protocol configurations and physical
attributes, whether they are encapsulated with PPP, and whether they use the default 16-bit CRC.
Check whether they have been shut down.
NOTE
If interfaces on both ends have different CRC configurations, communication between them will fail
because of CRC errors.
l If the two serial interfaces have different configurations, reconfigure them.
l If the two serial interfaces have the same configurations but cannot correctly send or receive
data, go to step 3.
Step 3 Check whether the local and remote serial interfaces are sending and receiving data.
Run the display this interface command in the serial interface view to check the serial interface
status.
[Huawei-Serial1/0/0:0] display this interface
Serial1/0/0:0 current state : UP
Line protocol current state : UP
Last line protocol up time : 2008-01-08 02:59:55 UTC-05:13
Description:HUAWEI, AR Series, Serial1/0/0:0 Interface
Route Port,The Maximum Transmit Unit is 1500, Hold timer is 0(sec)
Derived from E1 1/0/0, Timeslot(s) Used: 1, baudrate is 64000 bps
Internet Address is 1.1.1.2/24
Link layer protocol is PPP
LCP opened, IPCP opened
Last physical up time : 2008-01-08 02:59:52 UTC-05:13
Last physical down time : 2008-01-07 22:40:43 UTC-05:13
Current system time: 2008-01-08 03:33:42-05:13
Huawei AR2200-S Series Enterprise Routers
Troubleshooting 5 WAN
Issue 01 (2012-01-06) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
83
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