Release Notes G.07. 53

Enhancements in Release G.07.xx

Correction to the Management and Configuration Guide

Configuring Static IP Routes

The IP route table can receive routes from the following sources:

 Directly-connected networks – When you add an IP VLAN interface, the routing switch

automatically creates a route for the network the interface is in.

 Statically configured route – You can add up to 16 routes directly to the route table. When

you add a route to the IP route table, you are creating a static IP route. This section describes

how to add static routes to the IP route table.

 Default network route – This is a specific static route that the routing switch uses if other

routes to the destination are not available. Refer to “Configuring the Default Route” in the chapter

titled “IP Routing Features” in the Management and Configuration Guide for your switch.

Static Route Types

You can configure the following types of static IP routes:

 Standard – the static route consists of the destination network address and network mask, and

the IP address of the next-hop gateway.

 Null (reject) – the static route consists of the destination network address and network mask,

and the reject parameter. Typically, the null route is configured as a backup route for discarding

traffic if the primary route is unavailable. By default, when IP routing is enabled, a route for the

127.0.0.0/8 network is created to the null interface. Traffic to this interface is rejected (dropped).

This route is for all traffic to the “loopback” network, with the single exception of traffic to the

host address of the switch’s loopback interface (127.0.0.1/32). Figure 3 on page 11 illustrates the

defa

ult Null route entry in the switch’s routing table.

Static IP Route Parameters

When you configure a static IP route, you must specify the following parameters:

 The IP address and network mask for the route’s destination network.

 The route’s path, which can be one of the following:

• The IP address of a next-hop gateway

• A “null” interface. In this case the routing switch invokes a “reject” parameter on a static

route entry, which results in the switch dropping traffic forwarded to the null interface.

The switch automatically assigns a metric of “1” to an IP static route.

Static Route States Follow VLAN (Interface) States

IP static routes remain in the IP route table only so long as the VLAN interface used by the route is

available. If the VLAN becomes unavailable (that is, if all ports in the VLAN are offline), the software

removes the static route from the IP route table. If the VLAN later becomes available again, the

software adds the route back to the route table.