Reference Guide

Setting OSPF Adjacency with Cisco Routers
To establish an OSPF adjacency between Dell Networking 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.
For more information regarding this functionality or for assistance, go to http://support.dell.com/force10.
To ensure equal intervals between the routers, use the following command.
• Manually set the dead interval of the Dell Networking router to match the Cisco configuration.
INTERFACE mode
ip ospf dead-interval <x>
In the following example, the dead interval is set at 4x the hello interval (shown in bold).
Example of Setting a Dead Interval
FTOS(conf)#int gi 2/2
FTOS(conf-if-gi-2/2)#ip ospf hello-interval 20
FTOS(conf-if-gi-2/2)#ip ospf dead-interval 80
FTOS(conf-if-gi-2/2)#
In the following example, the dead interval is set at 4x the hello interval (shown in bold).
Example of Viewing Dead Interval Setting
FTOS (conf-if-gi-2/2)#ip ospf dead-interval 20
FTOS (conf-if-gi-2/2)#do show ip os int gi1/3
GigabitEthernet 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-gi-2/2)#
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.
OSPF features and functions are assigned to each router using the CONFIG-INTERFACE commands for each
interface.
NOTE: By default, OSPF is disabled.
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