简介
本文档介绍在Cisco ASR5000上执行同步传输模块(STM)/OC3卡切换所需的步骤。
背景信息
ASR5000上的STM1/OC3卡提供STM-1端口，因此需要特别小心处理。
的 STM-1 (级别1)是同步数字层次结构(SDH)ITU-T光纤网络传输标准。其比特率为155.52 Mb/s。
SDH与以太网不同，并且包含一些必须考虑的细节。
问题
该设置有一对STM1/OC3卡，配置了自动保护交换(APS)模式冗余 — 卡21和卡37。卡37处于活动状态，卡21处于备用状态。端口21/1和21/2处于关闭状态，APS工作。37/1和37/2端口已启用，并受APS保护。
card 21
redundancy aps-mode
aps 1+1 uni-directional non-revertive
framing sdh e1
initial-e1-framing crc4
service-type frame-relay
#exit
******** show card table all *******
Slot Card Type Oper State SPOF Attach
----------- -------------------------------------- ------------- ---- ------
21: LC 4 PORT STM1/OC3 Channelized Card Standby - 5
37: LC 4 PORT STM1/OC3 Channelized Card Active No 5
[local]gre2mme01# show aps info 37/1
Port :37/1
Role : Protected
Mode : 1+1
Revertive : No
State : Active
Direction : Uni
Wait To Restore(sec) : 0
Redundant Port : 21/1
Lockout : No
[local]gre2mme01# show aps info 21/1
Port :21/1
Role : Working
Mode : 1+1
Revertive : No
State : Standby
Direction : Uni
Wait To Restore(sec) : 0
Redundant Port : 37/1
Lockout : No
[local]mme01# show port table
Thursday March 08 11:20:20 CET 2018
Port Role Type Admin Oper Link State Pair Redundant
----- ---- ------------------------ -------- ---- ---- ------- ----- ---------
21/1 Srvc STM1/OC3 Channelized Enabled - Down Standby 37/1 APS Workn
21/2 Srvc STM1/OC3 Channelized Enabled - Down Standby 37/2 APS Workn
37/1 Srvc STM1/OC3 Channelized Enabled - Up Active 21/1 APS Protd
37/2 Srvc STM1/OC3 Channelized Enabled - Up Active 21/2 APS Protd
在卡21和37之间执行切换的代表因“冗余模式错误”错误而失败。
[local]gre2mme01# card switch from 37 to 21
Friday March 09 00:28:10 CET 2018
Failure: wrong redundancy mode
解决方案
具有APS模式冗余的STM1/OC3卡不支持从X到Y的卡切换。
必须使用APS特定命令。
aps { clear slot#/port# | exercise slot#/port# | lockout slot#/port# | switch { force | manual } slot#/port# }
switch { force | manual } slot#/port#
Switch to either the working port or the protection port:
force: Forces a switch of ports, even if there is an active alarm state.
manual: Implements a switch of ports if there are no active alarms.
slot#/port# is the CLC2/OLC2 slot number (valid range is 17 - 48) and appropriate port number (CLC2 valid range is 1 - 4; OLC2 valid value is 1)
在本例中，问题通过以下方式解决：
aps switch manual 37/1
aps switch manual 37/2
注意：如果手动切换失败，可能是因为端口上的错误。使用“show aps port-status <card/slot>”验证端口状态。 切换仍然可以使用“force”选项强制进行。
[local]gre2mme01# show aps port-status 21/1
Friday March 09 13:19:49 CET 2018
Port : 21/1
Role : Working
Lockout : No
APS Signal Failure : No
APS Signal Degrade : No
Switch Over : No
Far End Failiure : No
Remote Not Compatible : No
Current Command : No Request
Switch Status : No request
[local]gre2mme01#
[local]gre2mme01# show aps port-status 37/1
Friday March 09 13:20:07 CET 2018
Port : 37/1
Role : Protected
Lockout : No
APS Signal Failure : No
APS Signal Degrade : No
Switch Over : No
Far End Failiure : No
Remote Not Compatible : No
Current Command : No Request
Switch Status : No request
Invalid K1 K2 : No
Rx K1 : Reqest : 0x 0 (-- Channel - 0)
Rx K2 : Status : 0x 0 (-- Channel - 0)
Tx K1 : Reqest : 0x 0 (No Request Channel - 0)
Tx K2 : Status : 0x 4 (UNI,1+1 Channel - 0)
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