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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
Chapter 35 Configuring IP Unicast Routing
Configuring OSPF
Nonstop Forwarding Awareness
The OSPF NSF Awareness feature is supported for IPv4 in the metro IP access image. When the
neighboring router is NSF-capable, the Layer 3 switch continues to forward packets from the
neighboring router during the interval between the primary Route Processor (RP) in a router crashing
and the backup RP taking over, or while the primary RP is manually reloaded for a non-disruptive
software upgrade.
This feature cannot be disabled. For more information on this feature see the OSPF Nonstop Forwarding
(NSF) Awareness Feature Guide at this URL:
http://cisco.com/en/US/products/sw/iosswrel/ps1839/products_white_paper09186a0080153edd.shtml
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:
Virtual link No area ID or router ID defined.
Hello interval: 10 seconds.
Retransmit interval: 5 seconds.
Transmit delay: 1 second.
Dead interval: 40 seconds.
Authentication key: no key predefined.
Message-digest key (MD5): no key predefined.
1. NSF = Nonstop forwarding
2. OSPF NSF awareness is enabled for IPv4 on switches running the metro IP access image
Table 35-5 Default OSPF Configuration (continued)
Feature Default Setting
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 internally used identification parameter that is
locally assigned and can be any positive integer. Each OSPF
routing process has a unique value.
Step 3
network address wildcard-mask area area-id Define an interface on which OSPF runs and the area ID for that
interface. You can use the wildcard-mask to use a single
command to define one or more multiple interfaces to be
associated with a specific OSPF area. The area ID can be a
decimal value or an IP address.
Step 4
end Return to privileged EXEC mode.
Step 5
show ip protocols Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
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