Configuring basic ospf parameters – Dell POWEREDGE M1000E User Manual
Page 921
38-29
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
OL-13270-03
Chapter 38 Configuring IP Unicast Routing
Configuring OSPF
OSPF NSF Capability
The IP-services feature set also supports OSPF NSF-capable routing for IPv4 for better convergence and
lower traffic loss following a stack-master change. When a stack-master change occurs in an OSPF
NSF-capable stack, the new stack master must do two things to resynchronize its link-state database with
its OSFP neighbors:
•
Release the available OSPF neighbors on the network without resetting the neighbor relationship.
•
Re-acquire the contents of the link-state database for the network.
After a stack-master change, the new master sends an OSPF NSF signal to neighboring NSF-aware
devices. A device recognizes this signal to mean that it should not reset the neighbor relationship with
the stack. As the NSF-capable stack master receives signals from other routes on the network, it begins
to rebuild its neighbor list.
When the neighbor relationships are reestablished, the NSF-capable stack master resynchronizes its
database with its NSF-aware neighbors, and routing information is exchanged between the OSPF
neighbors. The new stack master uses this routing information to remove stale routes, to update the
routing information database (RIB), and to update the forwarding information base (FIB) with the new
information. The OSPF protocols then fully converge.
Note
OSPF NSF requires that all neighbor networking devices be NSF-aware. If an NSF-capable router
discovers non-NSF-aware neighbors on a network segment, it disables NSF capabilities for that segment.
Other network segments where all devices are NSF-aware or NSF-capable continue to provide NSF
capabilities.
Use the nsf OSPF routing configuration command to enable OSPF NSF routing. Use the show ip ospf
privileged EXEC command to verify that it is enabled.
For more information about this feature, see the Cisco Nonstop Forwarding Feature Overview at this
URL:
Note
NSF is not supported on interfaces configured for Hot Standby Router Protocol (HSRP).
Configuring Basic OSPF Parameters
Enabling OSPF requires that you create an OSPF routing process, specify the range of IP addresses to
be associated with the routing process, and assign area IDs to be associated with that range.
Beginning in privileged EXEC mode, follow these steps to enable OSPF:
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
router ospf process-id
Enable OSPF routing, and enter router configuration mode. The
process ID is an internal identification parameter that is locally
assigned and can be any positive integer. Each OSPF routing
process has a unique value.