Cabletron Systems SmartSwitch manual Configuring Ospf, Ospf Multipath, Enabling Ospf, Enable Ospf

Chapter 9: OSPF Configuration Guide

OSPF Multipath

The SSR also supports OSPF and static Multi-path. If multiple equal-cost OSPF or static routes have been defined for any destination, then the SSR “discovers” and uses all of them. The SSR will automatically learn up to four equal-cost OSPF or static routes and retain them in its forwarding information base (FIB). The forwarding module then installs flows for these destinations in a round-robin fashion.

Configuring OSPF

To configure OSPF on the SSR, you must enable OSPF, create OSPF areas, assign interfaces to OSPF areas, and, if necessary, specify any of the OSPF interface parameters.

To configure OSPF, you may need to perform some or all of the following tasks:

•Enable OSPF.

•Create OSPF areas.

•Create an IP interface or assign an IP interface to a VLAN.

•Add IP interfaces to OSPF areas.

•Configure OSPF interface parameters, if necessary.

Note: By default, the priority of an OSPF router for an interface is set to zero, which makes the router ineligible from becoming a designated router on the network to which the interface belongs. To make the router eligible to become a designated router, you must set the priority to a non-zero value.

The default cost of an OSPF interface is 1. The cost of the interface should be inversely proportional to the bandwidth of the interface; if the SSR has interfaces with differing bandwidths, the OSPF costs should be set accordingly.

•Add IP networks to OSPF areas.

•Create virtual links, if necessary.

Enabling OSPF

OSPF is disabled by default on the SSR.

To enable or disable OSPF, enter one of the following commands in Configure mode.

Enable OSPF.	ospf	start
Disable OSPF.	ospf	stop

116 SmartSwitch Router User Reference Manual