Ospf Ack Packing; Ospf Adjacency With Cisco Routers - Dell Force10 Z9000 Configuration Manual

Enabling RFC-2328 Compliant OSPF Flooding
Figure 29-4.
00:10:41 : OSPF(1000:00):
Rcv. v:2 t:5(LSAck) l:64 Acks 2 rid:2.2.2.2
aid:1500 chk:0xdbee aut:0 auk: keyid:0 from:Vl 1000
LSType:Type-5 AS External id:160.1.1.0 adv:6.1.0.0 seq:0x8000000c
LSType:Type-5 AS External id:160.1.2.0 adv:6.1.0.0 seq:0x8000000c
00:10:41 : OSPF(1000:00):
Rcv. v:2 t:5(LSAck) l:64 Acks 2 rid:2.2.2.2
aid:1500 chk:0xdbee aut:0 auk: keyid:0 from:Vl 100
LSType:Type-5 AS External id:160.1.1.0 adv:6.1.0.0 seq:0x8000000c
LSType:Type-5 AS External id:160.1.2.0 adv:6.1.0.0 seq:0x8000000c
00:10:41 : OSPF(1000:00):
Rcv. v:2 t:4(LSUpd) l:100 rid:6.1.0.0
aid:0 chk:0xccbd aut:0 auk: keyid:0 from:Gi 10/21
Number of LSA:2
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
Use
show ip ospf
Enabling RFC 2328-Compliant OSPF Flooding
Figure 29-5.
FTOS#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 is non-configurable.

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.
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 command
to confirm that RFC 2328-compliant OSPF flooding is enabled, as shown below.
In contrast, the OSPF dead interval on a Cisco router is, by default, four
Printed only for ACK packets
No change in update packets
ip ospf dead-interval <x>
Open Shortest Path First (OSPFv2 and OSPFv3) | 631
in INTERFACE mode: