Create Dual Homed CEM service

Perform the following steps to create a dual homed CEM service:

1. Go to Configuration > Layer 2 > Services menu and click Complete Services option. The Complete Services page is displayed.
2. Click on . A series of new windows will be displayed for step-by step creation of a service.

• Step 1: General Attributes
  1. Enter a name for the service.
  2. Select the Technologies as 'MPLS-TP', Service Type as 'ELINE' and Domain as 'Qos Domain'.

     Circuit Emulation is only possible for MPLS-TP Qos-Domain Service.

  3. Select Circuit Emulation check box. On selection, Configure CESIWF gets added to steps of service creation on left panel of the General Attributes window.
  4. Select Dual Homing check box. On selection, Backup Nodes gets added to steps of service creation on left panel of the General Attributes window.
  5. Do one of the following:

     > To enable OAM on the service, select OAM as 'BFD Config'. BFD Configuration parameters are displayed.

     > To enable PWSM on the service, select OAM as 'Pw Status'. PW Status Configuration parameters are displayed.

     NOTE: Dual Homing is not applicable if OAM is set as 'None'.

  6. Enter rest other details as desired and click Next.

Refer General Attributes parameters table in the topic Create MPLS-TP service for parameter description.

• Step 2: Adding End Points
  1. Click Add on End Points page to choose the end point and the UNI port for the service.
  2. Under Network element column, select the desired node as an endpoint.

     There are two ways of searching the desired node from the list explained as follows:

     > Enter the IP address/user label of the node in the text box provided and click (Search Node by IP Address or UserLabel). Or,

     > Click (Add switches using map view) and select desired NEs from the Topology selection window launched. Click Done. Note that only one node can be added at a time.

  3. For the selected endpoint, add UNI by selecting the desired port. In case of TJ1600, select the LAG interface; for TJ1400 select the CEM Ethernet logical port [for example, CEM-ETH-1-1-21 port of card in slot 1].
  4. Under VLAN > First Tag column, enter the Vlan value. The vlan has to be assigned for every service. Create a vlan database for this purpose; one vlan per site.

     To view the used VLAN range, select the port and click Show Used VLans. View Used VLAN Range(s) window is displayed with a list of used VLAN values for the selected port.

  5. Associate the port with a Priority Mapping Profile or DSCP Mapping Profile or pair of TCProfile and COS values.

     In case of TCProfile, select UNI with TCP of multiples of 2.6 Mbps since one E1 equals to 2.6 Mbps. For four E1s the bandwidth required will be 10.4 Mbps. Select sTCM TCP only. For COS value select the 'Strict' priority COS only else an error will be displayed.

     To view the bandwidth utilization, click View BW. View Port BW Utilization window is displayed with the bandwidth utilization details of Ingress and Egress Port.

     

  6. Click Add Uni. The node is added on the End Points page. Ensure that the D check box against the Switch remains unchecked.
  7. Repeat Step a to f (Step 2: Adding End Points) to add the second endpoint. This node acts as a dual homed switch. In this instance, the Dual Homed check box will be selected by default. Also, the VLAN value remains the same as entered for the first endpoint.

     The following figure shows the Dual Homed switch and the access endpoint added:

     

  • Click Next.
• Step 3: Adding Backup Nodes

  NOTE: Only one Backup is allowed per primary node.

  1. On Backup Nodes page, choose a backup Network Element for Dual-Homed Primary Network Element by clicking on Add Backup button.
  2. Under Network element column, select the desired node as the backup node.

     There are two ways of searching the desired node as explained follows:

     > Enter the IP address/user label of the node in the text box provided and click (Search Node by IP Address or UserLabel). Or,

     > Click (Add switches using map view). Select desired NEs from the Topology selection window launched. Click Done.

  3. For the selected backup node, add Uni by selecting the desired port. The VLAN value under First Tag column will remain the same as previous.
  4. Click Add Uni. The backup switch gets added.

     

  5. Click Add Link to add an L2 trunk between the primary switch and the backup switch. The Topology Selection window is displayed.

     

     NOTE: In case of an ELine Dual Homed service over a single switch, the primary and backup switch are the same. Hence, no link has to be added and the Add Link button will not be present on the Backup Nodes page.

  6. Select the link between the highlighted switches and click Add Link. The Auto check box will be selected and the NNI (VLAN) value will reflect the VLAN value entered for the UNI.

     

• Creating Backup Switch

  NOTE: In case of dual homed CEM service, the backup switch and primary switch should be present in the same node.

  • Click Add Backup button.
  • Select the Node and the desired port.
  • Click OK. The following screen is displayed.

    

  • Click Add Link button. The following screen is displayed.

    NOTE: There should be a single hop link between Primary and Backup Node.

    

  • Select the path and click Add Link button.
  • Click Done. The PseudoWire window is displayed.
• PseudoWires
  • Provision pseudowire path between the end points.
  • Select the Auto Path checkbox to activate Find Path.
  • Select Find Path button. A graphical view of the provisioned pseudowire is displayed.
  • Click Next. The configure CESIWF page is displayed.

    

  • Click Add. The Configure CESIWF page is displayed.

    

  • Click Show Used ECID. The View Used ECID page displays used ECID and TDM channels.

    

  • Select the required values and click GO. The existing ECID values are displayed.
  • Close the window. Again the configure CESIWF page is displayed.
  • For adding another CESIWF, Click Add. Configure CESIWF for source and destination page is displayed.
  • Enter the required values by referring to the table Configure CESIWF for Source and Destination parameters in section Create CEM service.
  • Click OK. The Configure CESIWF page is displayed.
  • Click Next to view the summary of the service created.
  • Select Create to create the service or Create and activate to activate the service.
  • Click Finish. The CEM Services are created.