Troubleshooting guide

Section 5, User Interface Guide - UIG-540, SCU Utilities
61186003L1-1D 5-117
IP Forwarding Mode
The IP Forwarding Mode setting applies to the MX2820 system as a whole, and indicates the
side of the LAN where the MX2820 system resides. Generally, the LAN grows outward from the
Local side toward the Remote side. The Remote side of the LAN is considered to contain
devices that are not accessible from the Local side without the use of IP Forwarding. For
example, the Local side is typically where a gateway device would reside that provides access
outside of the LAN.
IP traffic will not be conducted across the IP Forwarding channels unless the Mode setting is
provisioned properly for the MX2820 systems at both the Local and Remote sides of the LAN.
CAUTION
Network problems can result if an MX2820 that resides on the
Local side is provisioned such that its Mode setting is Remote.
The available options for the Mode setting are described below:
Disabled
The IP Forwarding functionality of the MX2820 system is disabled. The SCU will not forward
any IP traffic received from its Ethernet port to any IP forwarding channels. Also, IP traffic
received from any IP forwarding channel will not be forwarded to the SCU Ethernet port.
Local
The SCU Ethernet port is connected directly to the Local side of the LAN.
Remote
The SCU Ethernet port is connected directly to the Remote side of the LAN.
IP Addresses for Forwarding Channels
Each IP forwarding channel can be assigned one or more unique IP addresses. Each IP
address that is assigned to an IP forwarding channel must be identical to an IP address of a
device that resides on the Remote side of the LAN (including the SCU of the Remote MX2820
system). Each IP forwarding interface must be assigned the same set of IP addresses at both
the Local and Remote sides of a given channel.
Provisioning Menu
Provisioning necessary for IP forwarding is set via a menu for the SCU and for the MUX. All
address-mux associations (herein called address routes) are sorted in the menu by mux pair
and then by IP address. Options are available for setting the Mode, adding and deleting
address routes, and designating the address route for the SCU. Refer to “DLP-730, Provision
DS3/DS2 Network” for settings in the MUX.