How to commission WDM TDM Board Interfaces?

This section describes how to commission the TDM interfaces of WDM network boards.

Prerequisites

Checking the hardware has been completed, the router device to be commissioned is running properly, the E1 cables on the AC sides for carrying TDM services are correctly connected, and network-side cables are connected correctly.

Context

As shown in below figure, a static routing protocol has to be deployed in the network to ensure normal communication between the DeviceA device and the network segment 172.16.1.0 where the DeviceB is located.

Typical networking diagram for TDM interface commissioning

Procedure

Configure a TDM serial interface and specify the protocol of the interface as TDM. The following uses serial interface 2/0/0:1 as an example to describe how to configure a TDM serial interface.
Configure a TDM PWE3 service for the serial interface.
For the detailed procedure, see the guides to configure TDM services for router devices. Then run the display this command on the router device to view the configurations of the serial interface.
```
[HUAWEI-Serial2/0/0:1] display this
      #
      interface Serial2/0/0:1
      link-protocol tdm
      mpls l2vc 2.2.2.2 pw-template 1 101
      #
      return 
```
On the device, use the same way to configure a TDM PWE3 service for the serial interface. Ensure that the PW profile parameters of the device are same.

On the router device, run the display mpls l2vc command to check the status of the TDM PW.

[HUAWEI] display mpls l2vc inter serial 2/0/0:1
      *client interface       : Serial2/0/0:1 is up                                                                                      
      Administrator PW       : no                                                                                                       
      session state          : up                                                                                                       
      AC status              : up                                                                                                       
      VC state               : up                                                                                                       
      Label state            : 0                                                                                                        
      Token state            : 0                                                                                                        
      VC ID                  : 101                                                                                                      
      VC type                : CESoPSN basic mode                                                                                       
      destination            : 2.2.2.2                                                                                                  
      local group ID         : 0            remote group ID      : 0                                                                    
      local VC label         : 16           remote VC label      : 20                                                                   
      local TDM Encap Num    : 8            remote TDM Encap Num : 8                                                                    
      jitter-buffer          : 4                                                                                                        
      local rtp-header       : disable      remote rtp-header    : disable                                                              
      local bit-rate         : 31           remote bit-rate      : 31                                                                   
      local AC OAM State     : up                                                                                                       
      local PSN OAM State    : up                                                                                                       
      local forwarding state : forwarding                                                                                               
      local status code      : 0x0                                                                                                      
      remote AC OAM state    : up                                                                                                       
      remote PSN OAM state   : up                                                                                                       
      remote forwarding state: forwarding                                                                                               
      remote status code     : 0x0                                                                                                      
      ignore standby state   : no                                                                                                       
      BFD for PW             : unavailable                                                                                              
      VCCV State             : up                                                                                                       
      manual fault           : not set                                                                                                  
      active state           : active                                                                                                   
      forwarding entry       : exist                                                                                                    
      OAM Protocol           : --                                                                                                       
      OAM Status             : --                                                                                                       
      OAM Fault Type         : --                                                                                                       
      PW APS ID              : 0                                                                                                        
      PW APS Status          : --                                                                                                       
      TTL Value              : 1                                                                                                        
      link state             : up                                                                                                       
      local VC MTU           : --           remote VC MTU        : --                                                                   
      local VCCV             : alert ttl lsp-ping bfd                                                                                   
      remote VCCV            : alert ttl lsp-ping bfd                                                                                   
      local control word     : disable      remote control word  : disable                                                              
      tunnel policy name     : tp31                                                                                                     
      PW template name       : 1                                                                                                        
      primary or secondary   : primary                                                                                                  
      load balance type      : flow                                                                                                     
      Access-port            : false                                                                                                    
      Switchover Flag        : false                                                                                                    
      VC tunnel/token info   : 1 tunnels/tokens                                                                                         
       NO.0  TNL type       : cr lsp, TNL ID : 0x3                                                                                     
       Backup TNL type      : lsp   , TNL ID : 0x0                                                                                     
      create time            : 0 days, 4 hours, 42 minutes, 2 seconds                                                                   
      up time                : 0 days, 0 hours, 3 minutes, 59 seconds                                                                   
      last change time       : 0 days, 0 hours, 3 minutes, 59 seconds                                                                   
      VC last up time        : 2014/11/28 14:44:27                                                                                      
      VC total up time       : 0 days, 0 hours, 3 minutes, 59 seconds                                                                   
      CKey                   : 2                                                                                                        
      NKey                   : 1                                                                                                        
      PW redundancy mode     : frr                                                                                                      
      AdminPw interface      : --                                                                                                       
      AdminPw link state     : --                                                                                                       
      Diffserv Mode          : pipe                                                                                                     
      Service Class          : ef                                                                                                       
      Color                  : green                                                                                                    
      DomainId               : --                                                                                                       
      Domain Name            : --

As shown in the command output, the interface configurations and cable connections are correct, no alarms are reported for the interface, and the PW is up. In addition, after a test instrument feeds a service to the router device, the service is transmitted properly.

Handling Common Faults

The PW profile parameters of the router device are inconsistent.

Handling procedure:

Run the display pw-template command on the router device to check whether the PW profile parameters are consistent. If they are inconsistent, make changes properly to make them consistent.

<HUAWEI> display pw-template
       PW Template Name : 1  
       PeerIP           : -- 
       Tnl Policy Name  : -- 
       CtrlWord         : Disable
       MTU              : 1500
       Max Atm Cells    : 28
       ATM Pack Overtime: 1000
       Seq-Number       : Disable
       TDM Encapsulation Number: 8
       Jitter-Buffer           : 4
       Rtp-Header              : Disable
       VCCV Capability  : alert ttl lsp-ping bfd
       Behavior Name    : --
       Total PW         : 0, Static PW : 0, LDP PW : 0

The AC-side interfaces that carry TDM services are not up. These interfaces include the E1 and serial interfaces.

Handling procedure 1:
1. In the E1 interface view, run the display this interface command to check whether the physical state of the interface is up. If the state is not up, handle the fault of the E1 interface being down.
2. In the serial interface view, run the display this interface command to check whether the serial interface has been shut down. If the serial interface has been shut down, run the undoshut serial command to turn on the interface.
3. In the serial interface view, run the display this command separately on the router device to check whether the TDM protocol is used on the two devices. If it is not, correct the setting to ensure that the two devices use the TDM protocol.
```
[HUAWEI-Serial2/0/0:1] display this
      #
      interface Serial2/0/0:1
      link-protocol tdm
      mpls l2vc 2.2.2.2 pw-template 1 101
      #
      return 
```

For the E1 interfaces on the router device, the channelized mode or the number of bound timeslots differs.

Handling procedure:

In the E1 interface view, run the display this command on the router device to view the channelized mode and number of bound timeslots configured for the E1 interfaces. If the configurations are inconsistent, correct them.

[HUAWEI-E1 2/0/0] display this
      #
      controller E1 2/0/0
      channel-set 1 timeslot-list 1-31
      undo shutdown
      #
      return      
      An example is as follows:
      [PPP_980B-E1 2/0/1]display this
      #
      controller E1 2/0/1
      using e1
      undo shutdown
      #
      return

The PW or tunnel that carries the TDM service is down.

Handling procedure: On the router device, run the display mpls l2vc ommand to check the PW status of the port where the service is interrupted.

[HUAWEI] display mpls l2vc inter serial 2/0/0:1
      *client interface       : Serial2/0/0:1 is up                        
       Administrator PW       : no                                     
       session state          : up                                   
       AC status              : up                                     
       VC state               : down                                   
       Label state            : 0                                      
       Token state            : 0                                      
       VC ID                  : 101                                    
       VC type                : CESoPSN basic mode                     
       destination            : 2.2.2.2                                
       local group ID         : 0            remote group ID      : 0  
       local VC label         : 16           remote VC label      : 22 
       local TDM Encap Num    : 8            remote TDM Encap Num : 8  
       jitter-buffer          : 4                                      
       local rtp-header       : disable      remote rtp-header    : disable
       local bit-rate         : 1            remote bit-rate      : 1  
       local AC OAM State     : up                                     
       local PSN OAM State    : up                                     
       local forwarding State : forwarding                             
       local status code      : 0x0                                    
       remote AC OAM State    : up                                     
       remote PSN OAM State   : up                                     
       remote forwarding State: not forwarding                         
       remote status code     : 0x1                                    
       ignore standby state   : no                                     
       BFD for PW             : unavailable                            
       VCCV state             : no                                     
       manual fault           : no set                                 
       active state           : inactive                               
       forwarding entry       : not exist                              
       OAM Protocol           : --                                     
       OAM Status             : --                                     
       OAM Fault Type         : --                                     
       PW APS ID              : 0                                      
       PW APS Status          : --                                     
       PW APS Status          : --                                     
       TTL Value              : 1                                      
       link state             : down                                   
       local VC MTU           : 2000         remote VC MTU        : 0  
       local VCCV             : cw alert ttl lsp-ping bfd              
       remote VCCV            : cw alert ttl lsp-ping bfd              
       local control word     : enable       remote control word  : enable              
       tunnel policy name     : --                                     
       PW template name       : 1                                      
       primary or secondary   : primary                                
       load balance type      : flow                                   
       Access-port            : false                                  
       Switchover Flag        : false                                  
       VC tunnel/token info   : 1 tunnels/tokens                       
         NO.0  TNL type       : lsp   , TNL ID : 0x2                   
         Backup TNL type      : lsp   , TNL ID : 0x0                   
       create time            : 0 days, 1 hours, 9 minutes, 32 seconds 
       up time                : 0 days, 0 hours, 0 minutes, 0 seconds  
       last change time       : 0 days, 1 hours, 9 minutes, 32 seconds 
       VC last up time        : 0000/00/00 00:00:00                    
       VC total up time       : 0 days, 0 hours, 0 minutes, 0 seconds  
       CKey                   : 4                                      
       NKey                   : 3                                      
       PW redundancy mode     : frr                                    
       AdminPw interface      : --                                     
       AdminPw link state     : --                                     
       Diffserv Mode          : pipe                                   
       Service Class          : ef                                     
       Color                  : green                                  
       DomainId               : --                                     
       Domain Name            : --

If the AC status is displayed as down in the command output, see the fault handling procedure for cause 3. If the session state is displayed as down, handle the fault by referring to the MPLS fault handling procedure.
If the AC status and the session state are displayed as up but the VC is down, check whether the VC ID, VC type, and control word of the router device are same .
If they are inconsistent, make changes properly to make them consistent. If they are consistent but the VC is down, handle the fault by referring to the tunnel fault handling procedure.

Handling procedure 2:
1. Check whether the QoS is configured for the network interface. If QoS is configured, handle the fault by referring to the QoS fault handling procedure.
2. If the physical state of the TDM link is displayed as *down, then the serial interface has been shut down manually. Enter the serial interface view and run the undo shutdown command.
3. If the physical state of the TDM link is displayed as down, then the E1 line is faulty. Handle the fault by referring to the E1 fault handling procedure.

The bandwidth allocated to the TDM service on the NNI side is insufficient, or the service packets of a higher priority occupied the bandwidth allocated to the TDM service.

Handling procedure:
1. Check whether the QoS is configured for the network interface. If QoS is configured, handle the fault by referring to the QoS fault handling procedure.
2. Check whether the bandwidth on the NNI side is sufficient for transmitting the TDM service. For example, if n timeslots have been configured for the TDM service, calculate the bandwidth required by one TDM service using the following formula: TDM service bandwidth = n x 8 x 8000/8 + Length of the Ethernet packet header.