Reference Guide

610 | Open Shortest Path First (OSPFv2)
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Figure 31-14 shows the convergence settings when fast-convergence is enabled and Figure 31-15 shows
settings when fast-convergence is disabled. These displays appear with the
show ip ospf command.
Figure 31-14. Command Example: show ip ospf process-id (fast-convergence enabled)
Figure 31-15. Command example: show ip ospf process-id (fast-convergence disabled)
Change OSPFv2 parameters on interfaces
In FTOS, you can modify the OSPF settings on the interfaces. Some interface parameter values must be
consistent across all interfaces to avoid routing errors. For example, you must set the same time interval for
the hello packets on all routers in the OSPF network to prevent misconfiguration of OSPF neighbors.
Use any or all of the following commands in CONFIGURATION INTERFACE mode to change OSPFv2
parameters on the interfaces:
Command Syntax Command Mode Usage
ip ospf cost CONFIG-INTERFACE Change the cost associated with OSPF traffic on
the interface.
Cost: 1 to 65535 (default depends on the
interface speed).
ip ospf dead-interval seconds CONFIG-INTERFACE Change the time interval the router waits before
declaring a neighbor dead. Configure Seconds
range: 1 to 65535 (default is 40 seconds).
The dead interval must be four times the hello interval.
The dead interval must be the same on all routers in the OSPF network.
FTOS(conf-router_ospf-1)#fast-converge 2
FTOS(conf-router_ospf-1)#ex
FTOS(conf)#ex
FTOS#show ip ospf 1
Routing Process ospf 1 with ID 192.168.67.2
Supports only single TOS (TOS0) routes
SPF schedule delay 5 secs, Hold time between two SPFs 10 secs
Convergence Level 2
Min LSA origination 0 secs, Min LSA arrival 0 secs
Number of area in this router is 0, normal 0 stub 0 nssa 0
FTOS#
Fast-converge parameter
setting
LSA Parameters
FTOS#(conf-router_ospf-1)#no fast-converge
FTOS#(conf-router_ospf-1)#ex
FTOS#(conf)#ex
FTOS##show ip ospf 1
Routing Process ospf 1 with ID 192.168.67.2
Supports only single TOS (TOS0) routes
SPF schedule delay 5 secs, Hold time between two SPFs 10 secs
Convergence Level 0
Min LSA origination 5 secs, Min LSA arrival 1 secs
Number of area in this router is 0, normal 0 stub 0 nssa 0
FTOS#
setting
LSA Parameters
Fast-converge parameter