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Configuring IP Forwarding for CTP Bundles (CTP Menu)

There are two ways to set up CTP bundles for IP forwarding:

  • Direct drive—Packets are forwarded directly between drivers on the local and remote CTP device. Use this method for simple port-to-port configurations. We recommend that you use this method with supervision from JTAC.
  • Direct drive disabled—Packets are forwarded based on information in the kernel’s IP stack.

Before you begin:

  • Disable the bundle before you modify the bundle options.

To configure IP forwarding for CTP bundles using the CTP Menu:

  1. From the CTP Main Menu, select 1) Bundle Operations.
  2. Select 1) CTP.
  3. Select a bundle from the list.

    If you select an active bundle, you are prompted to disable the bundle before configuring it.

  4. Select 2) Config.
  5. Select 10) Advanced Options.
  6. Configure option 13 as described in Table 18.

Table 18: CTP Bundle IP Forwarding Settings in the CTP Menu

FieldFunctionYour Action

Disable direct drive

Specifies whether the CTP bundle uses direct drive or IP tables to forward packets.

If you are using route redundancy, port mirroring, or VLANs, you must disable direct drive and use IP tables.

If any port on the CTP node is configured for a PBS or bridged port, then the Direct Drive option is automatically set to Disabled on all existing and future bundles on that node.

If a port is configured as a PBS or Bridged port, then the bundles on that port is deleted. If a bundle is created on a different port, then it disables Direct Drive on that port when other ports are configured as a PBS or bridged port.

Until CTPView Release 7.1R1, the direct drive feature is enabled by default and this functionality configuration is not displayed in the output of the bundle query. If you explicitly enabled the direct drive capability (using IP tables instead of direct drive for packet-forwarding), the bundle query displayed "NotDirDrv" when you run the bundle query from the Main Menu of CTP Menu by selecting 1) Query. Starting with CTPOS and CTPView Release 7.2, the default behaviour is direct-drive disabled (IP table is turned on for forwarding of packets). With default configuration, the bundle query output does not display the direct drive settings. Only if you explicitly enable the direct-drive capability, the bundle query output displays "Bndl Config Flags: DirDrv" in bundle query. CTP bundle circuits that use route redundancy and port forwarding must have direct drive disabled to allow for asymmetric routing. When direct drive is disabled, packets are forwarded based on information in the kernel’s IP stack. When direct drive is enabled, packets are forwarded directly between drivers on the local and remote CTP device.

Select one:

  • YES—CTP uses the kernel’s IP stack to forward packets.
  • NO—CTP uses direct drive to forward packets.

Modified: 2015-11-17