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Cisco ME 3800X and 3600X Switch Software Configuration Guide
OL-23400-01
Chapter 29 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 document at this URL:
http://www.cisco.com/en/US/docs/ios/12_2t/12_2t15/feature/guide/ftosnsfa.html
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.
Log adjacency changes Enabled.
Neighbor None specified.
Neighbor database filter Disabled. All outgoing LSAs are flooded to the neighbor.
Network area Disabled.
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 switches running the metro IP access image
Table 29-5 Default OSPF Configuration (continued)
Feature Default Setting
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