Create Dual Homed ELAN service

Dual homing is only supported in .1q/.1ad ELINE services, MPLS-TP ELINE and MPLS-TP ELAN services.

Perform the following steps to create a dual homed ELAN Service:

Go to Configuration > Layer 2 > Services menu and click Complete Services option. The Complete Services page is displayed.
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 and select the Technologies as 'MPLS-TP'.
2. Select the Service Type as 'ELAN' and Mesh as 'Hub and Spoke' from the drop down menu.
3. Do one of the following:
  > To create the service in Non Qos Domain, select the Domain as 'Non Qos Domain'.
  
  > To create the service in Qos Domain, select the Domain as 'Qos Domain'.
  
  > To create the service in any of the two domain, select the Domain as "All Domain'.
4. Do one of the following:
  > To disable OAM on the service, select OAM as 'None' from drop down menu.
  
  > To enable OAM on the service, select OAM as 'BFD Config'. Select BFD Configuration parameters displayed.
  
  > To enable PWSM on the service, select OAM as 'Pw Status'. Select PW Status Configuration parameters displayed.
5. Select Enable PSC check box to enable Protection State Coordination, if desired. Enter rest other details and click Next.

Refer to General Attributes parameters table in the topic Create ELAN services with Hub and Spoke for description of parameters on General Attributes page.

Step 2: Adding End Points
1. Click Add Hub on End Points page to add the hub and the UNIs for the service creation.
2. Under Network element column, select the desired node as the Hub and then select the Dual Homed check box if a dual homed hub is desired.
  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 endpoint, add Uni by selecting the check box against the desired port and do one of the following,
  > If Domain is selected as 'Non Qos Domain' or All Domain' in General Attributes page, enter the VLAN value only under Outer VLAN column. For All Domain the UNI port can be associated with TCProfile and CoS-0.
  
  > If Domain is selected as 'Qos Domain', enter the VLAN value under Outer VLAN column and associate a Priority Mapping Profile or DSCP Mapping Profile or a pair of TCProfile and COS values.
4. Click Add Uni. The UNI gets added. Similarly, user can add more UNIs to the node (if desired), else click Ok.
  Repeat steps a to d (Step 2: Adding End Points) to add another hub to the service. Dual Homing can be enabled for this Hub also.
  
  Following figure shows a Dual Homed Hub with two UNIs added to the service. Add Backup button will be displayed when a dual homed Hub is selected:
5. User has to now add backup node for the dual homed hub(s). Select the Hub on which Dual Homed check box was selected and click Add Backup.
6. Select the desired node as backup, add the UNI port and enter the other values required. Click Add Uni > Ok. The backup node is added.
  NOTE: In the image shown above, the backup is added to a single hub only. In this case, spokes with dual homed protection can be added the hub with backup only. If however, the user is looking at a load sharing scenario where the spokes with Dual Homing protection are added to both the hubs (Hub A acting as primary for half the spokes and Hub B for the other half), it would be necessary for both the hubs to have backups. In this case, Hub A and Hub B could act as each other's backup to reduce the load on single hub (in case of multiple spokes).
7. Select the Hub to which the spoke(s) have to be added and click Add Spoke.
8. Select the desired node as spoke, add the UNI port and enter the other values required. Click Add Uni > Ok. Repeat step g and h to add another spoke to the selected Hub. Following figure shows the Hub with two spokes added:
9. Click Next. The PseudoWires page is displayed.

End Points parameters

Parameter		Description

Choose a participating network element.
		Search Node by IP Address or UserLabel button allows you to search the node from the network element list. Enter the IP address or user label of the desired node in the text box provided and click this button.
		Load all nodes button reloads all the nodes in network element list.
		Add switches using map view button allows you to select the switches from the topology selection window.
Network element
IP Address		Displays the IP address of the node.
User Label		Displays the node label.
EmsName		Displays the EMS name in which the given node is present.
IGMP		Parameter not applicable.
ci-si-pn		Displays the shelf index, slot index and port number.
Port Type		Displays the port type.
VLAN	Traffic Type	Allows you to select the type of traffic as 'Tagged' or 'Untagged' or 'TLS'.
	Outer VLAN	Enter the VLAN ID. Acceptable value range from 1 to 4094 or 1 to 2¹² -1.
	Inner VLAN	This parameter is applicable when VLAN type of port is .1ad with .1q. Then .1q VLAN is inner VLAN and .1ad VLAN is outer VLAN.
Prio		Displays the priority. Parameter not applicable, hence displays N/A.
DSCP Mask		The mask assigned for Differentiated Services Code Point (DSCP) field. Parameter not applicable, hence displays N/A.
DSCP Value		The Differentiated Services Code Point (DSCP) value defined for DEI bit. Parameter not applicable, hence displays N/A.
TCProfile		Allows to select the TCProfile created at the NMS level. Acceptable values includes a list of TC Profiles created.
COS		Allows to select an identifier for the default CoS queue to which the packet is assigned. Acceptable value ranges from 0 to 7.
Priority Mapping Profile		Allows you to associate a priority mapping profile to the selected port from the drop down list.
DSCP Mapping Profile		Allows you to associate a DSCP mapping profile to the selected port from the drop down list.
IGMP		Parameter not applicable.
L2 ACL		Parameter not applicable.
Choose end points using add and remove buttons.
Switch		Displays the switch IP address of the selected node.
Port		Displays the UNI port selected for creation of end points.
UNI Type		Displays the type of switching protocol of the user network interface.
Outer VLAN		Displays the selected VLAN ID.
Inner VLAN		Displays the selected VLAN ID when VLAN type of port is .1ad with .1q.
Prio		Displays the priority.
DSCP Mask		The mask assigned for Differentiated Services Code Point (DSCP) field.
DSCP Value		The Differentiated Services Code Point (DSCP) value defined for DEI bit.
TCProfile		Displays the TCProfile selected for the UNI port created at the NMS, if any; else N/A is displayed.
COS		Displays the selected identifier for the default CoS queue to which the packet is assigned.
Priority Profile		Displays the priority mapping profile associated with the UNI port, if any; else N/A is displayed.
DSCP Mapping Profile		Displays the DSCP mapping profile associated with the UNI port, if any; else N/A is displayed.
Igmp Profile		This parameter is not applicable.
Add Hub		Add Hub button allows the user to add hub node(s) for the creation of Hub and Spoke service.
Remove Hub		Remove Hub button allows the user to remove the selected hub node chosen for Hub and Spoke service creation.
Add Hub Uni		Add Hub Uni button allows the user to add more UNI(s) to the hub node.
Add Spoke		Add Spoke button allows the user to add spoke(s) to the selected hub node.
Add/Remove Backup		Add Backup button allows the user to add a backup node to the selected Dual Homed Hub. After adding the backup node, the Add Backup is replaced by Remove Backup button using which can be used to remove the backup node added.

Step 3: PseudoWires

The PseudoWires page of Create Service provides the options to add or remove protection, selection of pseudowire path manually or automatic path detection, MA configuration, and Qos Configuration.

Create Dual Home ELAN Service- Step 3 (PseudoWires Page) ELAN Dual Homed

The (DH) check box will be selected by default against the pseudowire endpoints (Sw1--Sw2) with dual homed protection enabled.
To edit MA configuration parameters, click MA Configuration tab and select or enter the required values.
To add or remove protection on the pseudowire, select/un-select the (Protection) check box against the pseudowire end points (Sw1--Sw2) between Hub and Backup node. The check boxes will be selected by default.
To assign bandwidth at individual pseudowire level, select the desired endpoints and click Qos Configuration tab. For the predefined CoS value, user can manually assign the bandwidth (CIR and PIR) for A and Z end of the pseudowire.
NOTE: Service creation will fail if the bandwidth defined in TCProfile attached to any UNI port in the service is not available on the port. The user can then manually assign the bandwidth value for CIR and PIR in Qos Configuration tab.
Pseudowire path selection can be done in two ways as explained follows:

To find pseudowire path automatically,

First enable Find Path button by selecting the (Auto Path) check box. The check box will be selected by default.
Click Find Path. A success message is displayed. Path is found successfully.
Click OK and select a pseudowire endpoints (Sw1--Sw2) to view its path under the View tab.
Graphical representation of the pseudowire detected automatically is displayed under the View tab as shown in the following figure. Details of work and protect path, excluded switches, and excluded tunnels are available under Details column:

NOTE: When finding the pseudowire path automatically, the user is provided an option to exclude switches/tunnels. Select Excluded Switches and Excluded Tunnels tab. Click Add button and select the desired nodes and/links. Click Exclude Nodes or Exclude Links followed by Done. Remove button can be used to delete the added data. Select Find Path. Pseudowire path is calculated once again, excluding the selected switches/tunnels in the path.

To find pseudowire path manually,

Un-check the (Auto Path) check box and then select the endpoints (Sw1--Sw2). The Manual Path button is displayed under the View tab.
Click Manual Path. The topology selection window is displayed.
Select the path/link connecting the two selected end points (highlighted in black) and click Add Work. The work path is added and represented in blue solid line.
To add protection path, select the path/link connecting the selected two end points (highlighted in black) and click Add Protect. The protect path is added and represented in blue dashed line.
Click Done. In case path addition fails, the partial link selection will be reset.
Graphical representation of the pseudowire added is displayed on the PseudoWires page under View tab along with work and protect path details under Details column.
Click Next.

Step 4: PW Status Info

The PW Status Info page of Create Service is displayed if OAM was selected as 'Pw Status' on General Attributes page. It provides the option to select attachment circuits for the pseudowire end points.

To add an attachment circuit, select the Attachment Circuit check box against the desired PW Name.
For the endpoints of the selected pseudowire, select the attachment circuit from the drop down menu and click OK to confirm. Attachment circuit added successfully message is displayed. Click OK.

For ELAN service, repeat the two steps a and b above for adding attachment circuit to other pseudowire end points. In case if the user desires to change the added attachment circuit on a pseudowire, select that pseudowire under PW Name. The added attachment circuit will be displayed under the end points. Select another attachment circuit from the drop down menu and click OK.
Click Next.

Step 5: Advance Configuration

On Advance Configuration window, Storm Control Configuration is performed. Select the Enable Broadcast/MultiCast Stormcontrol check box if desired and then enter the BroadCast/Multicast Stormcontrol value in Mbps in the text box displayed. Click Next to view the summary of the service.

Create Dual Homed Service- Step 5 (Advance Configuration)

Step 6: Summary

On Summary page of Create Service, the end points with the connecting pseudowire is displayed as shown in the following figure:

Create Dual Homed ELAN service- Step 6 (Summary)

From the drop down menu, select Create to create the service or Create and Activate to create and activate the service as desired.
Click Finish. Service creation command sent successfully message is displayed.
Click OK. The status of the service can be checked in Complete Services page.