Specifications

Implementing OSPF on Cisco IOS XR Software
How to Implement OSPF on Cisco IOS XR Software
RC-269
Cisco IOS XR Routing Configuration Guide
Examples
In the following example, the show ospf EXEC command is used to verify that the initial SPF schedule
delay time, minimum hold time, and maximum wait time are configured correctly. Additional details are
displayed about the OSPF process, such as the router type and redistribution of routes.
RP/0/RP0/CPU0:router# show ospf 1
Routing Process "ospf 1" with ID 192.168.4.3
Supports only single TOS(TOS0) routes
Supports opaque LSA
It is an autonomous system boundary router
Redistributing External Routes from,
ospf 2
Initial SPF schedule delay 5 msecs
Minimum hold time between two consecutive SPFs 100 msecs
Maximum wait time between two consecutive SPFs 1000 msecs
Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs
Number of external LSA 0. Checksum Sum 00000000
Number of opaque AS LSA 0. Checksum Sum 00000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
External flood list length 0
Non-Stop Forwarding enabled
Note For a description of each output display field, see the show ospf command in the OSPF Commands on
Cisco IOS XR Software module in the Cisco IOS XR Routing Command Reference document.
Configuring Cisco-Specific Nonstop Forwarding for OSPF Version 2
This task explains how to configure Cisco- specific OSPF NSF on your NSF-capable router. This task is
optional.
Prerequisites
OSPF NSF requires that all neighbor networking devices be NSF aware, which happens automatically
after you install the Cisco IOS XR image on the router. If an NSF-capable router discovers that it has
non-NSF-aware neighbors on a particular network segment, it disables NSF capabilities for that
segment. Other network segments composed entirely of NSF-capable or NSF-aware routers continue to
provide NSF capabilities.
See the “Nonstop Forwarding for OSPF Version 2” section on page 235 for conceptual information.
Restrictions
The following are restrictions when configuring nonstop forwarding:
• OSPF Cisco NSF for virtual links is not supported.
• Neighbors must be NSF aware.