GE C30 Instruction Manual page 187

CHAPTER 5: SETTINGS
By default, the value of the destination field is 127.0.0.1 for all static routes (1 to 6). This is equivalent to saying that the
static routes are not configured. When the destination address is 127.0.0.1, the mask and gateway also must be kept on
default values.
By default, the value of the route gateway address is 127.0.0.1. This means that the default route is not configured.
To add a route:
1. Use any of the static network route entries numbered 1 to 6 to configure a static network route. Once a route
destination is configured for any of the entries 1 to 6, that entry becomes a static route and it must meet all the rules
listed in the next section, General Conditions to be Satisfied by Static Routes.
2. To configure the default route, enter a default gateway address. Once a default gateway address is configured, it
must be validated against condition 2 of the General Conditions to be Satisfied by Static Routes, where the route
gateway must be on a connected network.
To delete a route:
1. Replace the route destination with the default loopback address of 127.0.0.1. When deleting a route, the mask and
gateway also must be brought back to default values.
2. Delete the default route by replacing the default gateway with the default value of 127.0.0.1.
General conditions to be satisfied by static routes
The following rules are validated internally:
• The route mask has IP mask format. In binary this needs to be a set of contiguous bits of 1 from left to right, followed
by one or more contiguous bits of 0.
• The route destination and mask must match. This can be verified by checking that
RtDestination and RtMask = RtDestination
Example of good configuration: RtDestination = 10.1.1.0; Rt Mask = 255.255.255.0
Example of bad configuration: RtDestination = 10.1.1.1; Rt Mask = 255.255.255.0
The following rules must be observed when you configure static routes:
• The route destination must not be a connected network
• The route gateway must be on a connected network. This rule applies to the gateway address of the default route as
well. This can be verified by checking that:
(RtGwy & Prt1Mask) == (Prt1IP & Prt1Mask) || (RtGwy & Prt2Mask) == (Prt2IP & Prt2Mask) || (RtGwy & Prt3Mask) == (Prt3IP
& Prt3Mask)
where
& is the bitwise-AND operator
== is the equality operator
|| is the logical OR operator
Routing behavior compared to previous releases
Prior to release 7.10, UR devices did not have an explicit manner of configuring routes. The only available route was the
default route configured as part of the network settings (port gateway IP address). This limited the ability to route to
specific destinations, particularly if these destinations were reachable through a different interface than the one on which
the default gateway was.
Starting with UR 7.10, up to six static network routes can be configured in addition to a default route. The default route
configuration was also moved from the network settings into the routing section.
The figure shows an example of topology that benefits from the addition of static routes.
C30 CONTROLLER SYSTEM – INSTRUCTION MANUAL
PRODUCT SETUP
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