Ospf Ack Packing; Setting Ospf Adjacency With Cisco Routers - Dell S4820T Configuration Manual
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LSType:Type-5 AS External(5) Age:1 Seq:0x8000000c id:170.1.1.0 Adv:6.1.0.0
Netmask:255.255.255.0 fwd:0.0.0.0 E2, tos:0 metric:0
LSType:Type-5 AS External(5) Age:1 Seq:0x8000000c id:170.1.2.0 Adv:6.1.0.0
Netmask:255.255.255.0 fwd:0.0.0.0 E2, tos:0 metric:0
To confirm that you enabled RFC-2328–compliant OSPF flooding, use the show ip ospf command.
Dell#show ip ospf
Routing Process ospf 1 with ID 2.2.2.2
Supports only single TOS (TOS0) routes
It is an Autonomous System Boundary Router
It is Flooding according to RFC 2328
SPF schedule delay 5 secs, Hold time between two SPFs 10 secs
Number of area in this router is 1, normal 0 stub 0 nssa 1
--More--
OSPF ACK Packing
The OSPF ACK packing feature bundles multiple LS acknowledgements in a single packet, significantly
reducing the number of ACK packets transmitted when the number of LSAs increases.
This feature also enhances network utilization and reduces the number of small ACK packets sent to a
neighboring router. OSPF ACK packing is enabled by default and non-configurable.
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 Dell Networking OS, 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 Dell
Networking OS. 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.
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>
Examples of Setting and Viewing a Dead Interval
In the following example, the dead interval is set at 4x the hello interval (shown in bold).
Dell(conf)#int tengigabitethernet 2/2
Dell(conf-if-te-2/2)#ip ospf hello-interval 20
Dell(conf-if-te-2/2)#ip ospf dead-interval 80
Dell(conf-if-te-2/2)#
In the following example, the dead interval is set at 4x the hello interval (shown in bold).
Dell (conf-if-te-2/2)#ip ospf dead-interval 20
Dell (conf-if-te-2/2)#do show ip os int tengigabitethernet 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
Open Shortest Path First (OSPFv2 and OSPFv3)
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