ACKs 2 (shown in bold) is printed only for ACK packets.00:10:41 : OSPF(1000:00):Rcv. v:2 t:5(LSAck) l:64 Acks 2 rid:2.2.2.2aid:1500 chk:0xdbee aut:0 auk: keyid:0 from:Vl 1000LSType:Type-5 AS External id:160.1.1.0 adv:6.1.0.0 seq:0x8000000cLSType:Type-5 AS External id:160.1.2.0 adv:6.1.0.0 seq:0x8000000c00:10:41 : OSPF(1000:00):Rcv. v:2 t:5(LSAck) l:64 Acks 2 rid:2.2.2.2aid:1500 chk:0xdbee aut:0 auk: keyid:0 from:Vl 100LSType:Type-5 AS External id:160.1.1.0 adv:6.1.0.0 seq:0x8000000cLSType:Type-5 AS External id:160.1.2.0 adv:6.1.0.0 seq:0x8000000c00:10:41 : OSPF(1000:00):Rcv. v:2 t:4(LSUpd) l:100 rid:6.1.0.0aid:0 chk:0xccbd aut:0 auk: keyid:0 from:Gi 10/21Number of LSA:2LSType:Type-5 AS External(5) Age:1 Seq:0x8000000c id:170.1.1.0 Adv:6.1.0.0Netmask:255.255.255.0 fwd:0.0.0.0 E2, tos:0 metric:0LSType:Type-5 AS External(5) Age:1 Seq:0x8000000c id:170.1.2.0 Adv:6.1.0.0Netmask:255.255.255.0 fwd:0.0.0.0 E2, tos:0 metric:0To confirm that you enabled RFC-2328–compliant OSPF flooding, use the show ip ospf command.Dell#show ip ospfRouting Process ospf 1 with ID 2.2.2.2Supports only single TOS (TOS0) routesIt is an Autonomous System Boundary RouterIt is Flooding according to RFC 2328SPF schedule delay 5 secs, Hold time between two SPFs 10 secsNumber of area in this router is 1, normal 0 stub 0 nssa 1--More--OSPF ACK PackingThe OSPF ACK packing feature bundles multiple LS acknowledgements in a single packet, significantly reducing the number of ACKpackets 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. OSPFACK packing is enabled by default and non-configurable.Setting OSPF Adjacency with Cisco RoutersTo establish an OSPF adjacency between Dell Networking and Cisco routers, the hello interval and dead interval must be the sameon 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 Ciscorouter is, by default, four times as long as the hello interval. Changing the hello interval on the Cisco router automatically changes thedead 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 modeip ospf dead-interval Examples of Setting and Viewing a Dead IntervalIn the following example, the dead interval is set at 4x the hello interval (shown in bold).Dell(conf)#int tengigabitethernet 2/2Dell(conf-if-te-2/2)#ip ospf hello-interval 20Dell(conf-if-te-2/2)#ip ospf dead-interval 80Dell(conf-if-te-2/2)#Open Shortest Path First (OSPFv2 and OSPFv3) 495
