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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-06
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, beginning with
Cisco IOS Release
12.2(25)SEG. 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:
NSF
1
awareness Enabled
2
. Allows Layer 3 switches to continue forwarding packets from a neighboring
NSF-capable router during hardware or software changes.
Router ID No OSPF routing process defined.
Summary address Disabled.
Timers LSA group pacing 240 seconds.
Timers shortest path first (spf) spf delay: 5 seconds.
spf-holdtime: 10 seconds.
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 Cisco ME 3400 switches running the metro IP access image, Cisco IOS Release 12.2(25)SEG or later.
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.