Juniper CTP Series Manual page 49

Table 18: CTP Bundle IP Forwarding Settings in the CTP Menu
Field Function
Disable Specifies whether the CTP bundle uses direct drive or IP tables to forward packets.
direct
If you are using route redundancy, port mirroring, or VLANs, you must disable direct drive
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.
Copyright © 2018, Juniper Networks, Inc.
If you select an active bundle, you are prompted to disable the bundle before
configuring it.
Select 2) Config.
4.
Select 10) Advanced Options.
5.
Configure option 13 as described in
6.
Chapter 2: Configuring CTP Bundles
Table 18 on page 43.
Your Action
Select one:
YES—CTP uses the
kernel's IP stack to
forward packets.
NO—CTP uses
direct drive to
forward packets.
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