Configuring Subtending Systems

CDM subtending supports the following topology configurations:

• Tree

• Daisy chain

• Star

CDM subtending supports the following DSLAM interconnections, where the subtending chassis is called the parent, and the subtended chassis is called the child:

• NI-2 subtending NI-2

• NI-2 subtending NI-1

• NI-1 subtending NI-1

  For example, if you assign subscriber A to VPI 5 and VCI 10 on the subtended Cisco DSLAM, you must assign transit subscriber A to VPI 5 and VCI 10 on the host system. Transit subscribers on the subtending host system are logical containers for traffic that passes from the subtended DSLAM; therefore, you can create multiple transit subscribers on one port.

Step 3   In the IOS Host object list, select the DSLAM chassis that you want to configure as a subtending host.

Step 4   Click the IOS/Command Line Security tab.

Step 5   In the Login Password field, enter the password that you will use to login to the DSLAM, for example, via Telnet.

Step 6   In the Exec Password field, enter the password that you will use after the enable command.

Step 7   Click Save Locally.

Step 3   From the list box of chassis on the left side of the window, click the chassis whose topology you want to update.

Step 4   Click Update.

Step 5   From the list box on the left of network ports, click the trunk port.

In the Subtend Configuration area, the Interface Type field displays "trunk." The neighbor IP Address displays the IP address of the subtended port.

Step 6   From the list box on the left, click the subtending chassis (trunk).

Step 7   Right-click the name of the network port for the subtended chassis in the subtend view on the left side of the Map Viewer window.

The subtended DSLAM appears as a child of the subtending DSLAM subtend port.

Step 3   From the list box, highlight the name of the subtending chassis.

The Interface Type field in the Subtend Configuration area displays "trunk" for the subtending chassis interface and displays "subtend" for the subtended chassis interface.

Step 4   From the list box of network interfaces on the left, click the subtend interface of this DSLAM chassis.

Step 5   In the Subtend Configuration area neighbor IP Address field, enter the IP address of the subtended NI-1 DSLAM chassis that you want the subtending DSLAM to subtend.

Note   When configuring an NI-2 subtending DSLAM with NI-2 subtended DSLAMS, you do not need to use the Subtend Configuration area in this window.

Step 6   Click Connect.

CDM connects the subtended NI-1 DSLAM to the subtending NI-2 DSLAM.

Note   DSLAMs that are configured with NI-2 cards support the interim link management interface (ILMI) ATM specification. When two NI-2 DSLAMS are connected in a subtend relationship, CDM automatically discovers the neighbor IP address. You do not need to explicitly set up the connection when configuring an NI-2 subtended DSLAM as you do with an NI-1 subtended system. One consequence of ILMI support is that you are unable to disconnect a subtend connection. As long as the DSLAMs are physically connected, the connection is always present.

Step 3   From the list box, highlight the name of the subtending chassis.

Step 4   From the list box that lists the interfaces, click the subtending DSLAM chassis from which you want to disconnect a subtended chassis.

The Interface Type field in the Subtend Configuration area displays "trunk" for the subtending chassis interface and displays "subtend" for the subtended chassis interface.

Step 5   From the list box of network interfaces on the left, click the subtend interface of this DSLAM chassis.

Step 6   In the Subtend Configuration area neighbor IP Address field, enter the IP address of the subtended NI-1 DSLAM chassis that you want to disconnect.

Note   When disconnecting an NI-2 subtending DSLAM with NI-2 subtended DSLAMS, you do not need to use the Subtend Configuration area in this window.

Step 7   Click Disconnect.

CDM disconnects the subtended NI-1 DSLAM from the subtending NI-2 DSLAM.

Note   DSLAMs that are configured with NI-2 cards support the interim link management interface (ILMI) ATM specification. When two NI-2 DSLAMS are connected in a subtend relationship, CDM automatically discovers the neighbor IP address. You do not need to explicitly set up the connection when configuring an NI-2 subtended DSLAM as you do with an NI-1 subtended system. One consequence of ILMI support is that you are unable to disconnect a subtend connection. As long as the DSLAMs are physically connected, the connection is always present.

Note   For an NI-1 node, the DSL port should have a subscriber already assigned to it before you can successfully add the subtend PVC.

Step 4   Enter a unique ID in the Subscriber Subtend PVC ID field.

Note   See the "Guidelines for Configuring a Subtending System" section for more information on setting PVCs.

Step 5   Enter appropriate settings in the Source area as follows:

   a. In the VPI and VCI fields, enter the values to specify ingress for the subtend network.

   b. Alternatively, you can use the down arrow in the Auto Allocate field to select Yes.

Note   Setting Auto Allocate to Yes is only valid for NI-2 subtending DSLAMS, and allows CDM to automatically allocate this pair of values for the subtend network ingress.

Step 6   Enter appropriate settings for the Destination VPIs and VCIs, as follows:

   a. In the VPI and VCI fields, enter the values to specify egress for the subtend network.

   b. Alternatively, you can use the down arrow in the Auto Allocate field to select Yes.

Note   Setting Auto Allocate to Yes is only valid for NI-2 subtending DSLAMS, and allows CDM to automatically allocate this pair of values for the subtend network egress.

Step 7   For NI-2 subtended DSLAMs, in the NI1 Specific area ATM Profile field, enter the QoS profile that you want CDM to use for the NI-2 PVC.

Note   If you fail to enter a QoS profile in this field, CDM uses the default profile.

To upload a profile from the DSLAM node, follow these steps:

   a. Right-click the chassis and choose Cisco DSL Manager > Logical > Connection > Upload Management from the object menu.

   b. From the list box on the left side, click the chassis name from which you want to upload a profile.

   c. Click Upload to upload the profile.

Note   See the "Creating and Applying Profiles and Establishing Subscriber Connections" section and the "Uploading Profiles" section for instructions on creating a new profile and uploading profiles.

Step 8   For NI-1 subtended DSLAMs, set the following values:

Note   You must set these values for an NI-1 subtended chassis; CDM does not assign default values to these parameters.

   a. Use the down arrow in the Queue Priority field to select one of the following:

• Voice

• Voice Signalling

• Data, which is the recommended setting

   b. Use the down arrow in the Path Latency field to select Fast or Interleaved.

Step 9   Click Add.

An Action Report window opens to inform you whether this procedure is successful. While adding subtend PVCs, this information displays in the Action Report window. When CDM has successfully added the PVC, the left side of the Map Viewer window hierarchy view displays the Subtend PVC view. Below this, CDM displays the CiscoSubtendPVC_ count of the node in the subtend path from the leaf node]_[VPI/VCI ingress]_[VPI/VCI egress] for that specific PVC.

For NI-2 node PVC objects, you can also see this hierarchy view below the Component Managed View.

Note   The NI-1 controller does not add Cisco EMF objects for the PVCs that CDM creates for a particular subtending DSLAM. You must verify that individual PVC components are indeed in the node by using a MIB browser or the command line interface (CLI).

The PVC connections that you add display in the map view hierarchy below the port name. For example:

  DMT-1-4
   CiscoSubtendPVC_1_(2)
      CiscoSubtendPVC_1_HighVCL
      CiscoSubtendPVC_1_LowVCL

  The High VCL refers to the network side, and the Low VCL refers to the subscriber side.

Step 2   Choose Cisco DSL Manager > Delete Subtend PVC from the object menu.

Step 3   Click the subtend PVC from the list box on the left that you want to delete.

Step 4   Click Delete.

An Action Report window opens and displays the details of the deletion process. To verify that CDM has deleted the PVCs, check the Subtend PVC hierarchy view on the left side of the Map Viewer window. All the children from the Subtend PVC that you deleted should no longer display. Any NI-2 PVC objects should also no longer display from the Component Managed view. Verify that CDM has deleted all Subtend PVCs from the node by using an SNMP browser or the CLI.