Nonstop Forwarding Awareness; Configuring Basic Ospf Parameters - Cisco 3845 - Security Bundle Router Software Manual

Configuring OSPF
Table 29-5 Default OSPF Configuration (continued)
Feature
Log adjacency changes
Neighbor
Neighbor database filter
Network area
1
NSF awareness
Router ID
Summary address
Timers LSA group pacing
Timers shortest path first (spf)
Virtual link
1. NSF = Nonstop forwarding
2. OSPF NSF awareness is enabled for IPv4 on switches running the metro IP access image

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.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
29-24
Default Setting
Enabled.
None specified.
Disabled. All outgoing LSAs are flooded to the neighbor.
Disabled.
2
Enabled . Allows Layer 3 switches to continue forwarding packets from a neighboring
NSF-capable router during hardware or software changes.
No OSPF routing process defined.
Disabled.
240 seconds.
spf delay: 5 seconds.
spf-holdtime: 10 seconds.
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.
Chapter 29 Configuring IP Unicast Routing
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