Enable Fast-Convergence - Dell Force10 S4810P Configuration Manual

Figure 34-13.
FTOS#show ip ospf 34 int
GigabitEthernet 0/0 is up, line protocol is down
Internet Address 10.1.2.100/24, Area 1.1.1.1
Process ID 34, Router ID 10.1.2.100, Network Type BROADCAST, Cost: 10
Transmit Delay is 1 sec, State DOWN, Priority 1
Designated Router (ID) 10.1.2.100, Interface address 0.0.0.0
Backup Designated Router (ID) 0.0.0.0, Interface address 0.0.0.0
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 13:39:46
Neighbor Count is 0, Adjacent neighbor count is 0
GigabitEthernet 0/1 is up, line protocol is down
Internet Address 10.1.3.100/24, Area 2.2.2.2
Process ID 34, Router ID 10.1.2.100, Network Type BROADCAST, Cost: 10
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 10.1.2.100, Interface address 10.1.3.100
Backup Designated Router (ID) 0.0.0.0, Interface address 0.0.0.0
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
No Hellos (Passive interface)
Neighbor Count is 0, Adjacent neighbor count is 0
Loopback 45 is up, line protocol is up
Internet Address 10.1.1.23/24, Area 2.2.2.2
Process ID 34, Router ID 10.1.2.100, Network Type LOOPBACK, Cost: 1

Enable fast-convergence

The fast-convergence CLI sets the minimum origination and arrival LSA parameters to zero (0), allowing
rapid route calculation. When fast-convergence is disabled, origination and arrival LSA parameters are set
to 5 seconds and 1 second, respectively.
Setting the convergence parameter (1-4) indicates the actual convergence level. Each convergence setting
adjusts the LSA parameters to zero, but the fast-conver g ence parameter setting allows for even finer tuning
of the convergence speed. The higher the number, the faster the convergence. Use the following command
in the ROUTER OSPF mode to enable or disable fast-convergence.
Command Syntax
fast-convergence {number}
Note: A higher convergence level can result in occasional loss of OSPF adjacency. Generally, convergence level 1 meets
most convergence requirements. Higher convergence levels should only be selected following consultation with Dell
Force10 technical support.
744
| Open Shortest Path First (OSPFv2 and OSPFv3)
Command Example: show ip ospf process-id interface
Command Mode
CONFIG-ROUTER-
OSPF-id
Interface is not running the
OSPF protocol.
Usage
Enable OSPF fast-convergence and specify the convergence
level.
Parameter: 1-4
The higher the number, the faster the convergence.
When disabled, the parameter is set at 0 (Figure 34-15).