Cabletron Systems SmartSwitch Router, Руководство пользователя

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Chapter 9: OSPF Configuration Guide
116 SmartSwitch Router User Reference Manual
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