Ospf Nonstop Forwarding - Cisco 3750G - Catalyst Integrated Wireless LAN Controller Configuration Manual

Chapter 35 Configuring IP Unicast Routing
Table 35-5
Feature
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 Catalyst 3550, 3560 and 3750 switches running the IP services image, Cisco

OSPF Nonstop Forwarding

The switch stack supports two levels of nonstop forwarding (NSF):
•
•
OSPF NSF Awareness
Beginning with Cisco IOS Release 12.2(25)SE, the IP services image supports OSPF NSF Awareness
for IPv4. When a neighboring router is NSF-capable, the Layer 3 switch continues to forward packets
from the router before the backup Route Processor (RP) in a router takes over after the primary RP fails,
or while the primary RP is manually reloaded for a nondisruptive 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://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_white_paper09186a0080153edd.s
html
OSPF NSF Capability
Beginning with Cisco IOS Release 12.2(35)SE, the IP services image supports OSPF NSF-capable
routing for IPv4 for better convergence and lower traffic loss following a stack master change. When a
stack master change occurs in an OSPF NSF-capable stack, the new stack master must do two things to
resynchronize its link-state database with its OSFP neighbors:
•
•
OL-8550-02
Default OSPF Configuration (continued)
IOS Release 12.2(25)SEC or later.
OSPF NSF Awareness, page 35-27
OSPF NSF Capability, page 35-27
Release the available OSPF neighbors on the network without resetting the neighbor relationship.
Reacquire the contents of the link-state database for the network.
Default Setting
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.
Catalyst 3750 Switch Software Configuration Guide
Configuring OSPF
35-27