Dell Force10 MXL Blade - OSPF Adjacency with Cisco Routers; Configuration Information

Open Shortest Path First (OSPFv2) | 365
OSPF Adjacency with Cisco Routers
To establish an OSPF adjacency between Dell Force10 and Cisco routers, the hello interval and dead
interval must be the same on both routers. In FTOS, the OSPF dead interval value is, by default, set to
40 seconds, and is independent of the OSPF hello interval. Configuring a hello interval does not change the
dead interval in FTOS. In contrast, the OSPF dead interval on a Cisco router is, by default, four times as
long as the hello interval. Changing the hello interval on the Cisco router automatically changes the dead
interval as well.
To ensure equal intervals between the routers, manually set the dead interval of the Dell Force10 router to
match the Cisco configuration. Use the
ip ospf dead-interval <x> command in INTERFACE mode
(Figure 20-6) and (Figure 20-7).
Figure 20-6. Command Example for ip ospf intervals
Figure 20-7. OSPF Configuration with intervals set
For more information regarding this functionality or for assistance, go to www.force10networks.com/
support.
Configuration Information
The interfaces must be in Layer-3 mode (assigned an IP address) and enabled so that they can send and
receive traffic. The OSPF process must know about these interfaces. To make the OSPF process aware of
these interfaces, they must be assigned to OSPF areas.
You must configure OSPF GLOBALLY on the system in CONFIGURATION mode.
FTOS(conf)#int tengig- 2/2
FTOS(conf-if-te-2/2)#ip ospf hello-interval 20
FTOS(conf-if-te-2/2)#ip ospf dead-interval 80
FTOS(conf-if-te-2/2)#
Dead Interval
Set at 4x
Hello Interval
FTOS (conf-if-te-2/2)#ip ospf dead-interval 20
FTOS (conf-if-te-2/2)#do show ip os int tengig 1/3
TenGigabitEthernet 2/2 is up, line protocol is up
Internet Address 20.0.0.1/24, Area 0
Process ID 10, Router ID 1.1.1.2, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 1.1.1.2, Interface address 30.0.0.1
Backup Designated Router (ID) 1.1.1.1, Interface address 30.0.0.2
Timer intervals configured, Hello 20, Dead 80, Wait 20, Retransmit 5
Hello due in 00:00:04
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 1.1.1.1 (Backup Designated Router)
FTOS (conf-if-te-2/2)#
Dead Interval
Set at 4x
Hello Interval