Administrator Guide

Processing SNMP and Sending SNMP Traps
Only the process in default vrf can process the SNMP requests and send SNMP traps.
NOTE: SNMP gets request corresponding to the OspfNbrOption field in the OspfNbrTable returns a value of 66.
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 EMC Networking and Cisco routers, the hello interval and dead interval must be the same
on both routers.
In Dell EMC 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 EMC 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 EMC 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).
DellEMC(conf)#int gigabitethernet 2/2
DellEMC(conf-if-gi-2/2)#ip ospf hello-interval 20
DellEMC(conf-if-gi-2/2)#ip ospf dead-interval 80
DellEMC(conf-if-gi-2/2)#
In the following example, the dead interval is set at 4x the hello interval (shown in bold).
DellEMC(conf-if-gi-2/2)#ip ospf dead-interval 20
DellEMC(conf-if-gi-2/2)#do show ip os int gigabitethernet 1/3
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)
DellEMC(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.
NOTE: Loop back routes are not installed in the Route Table Manager (RTM) as non-active routes.
OSPF features and functions are assigned to each router using the CONFIG-INTERFACE commands for each interface.
Open Shortest Path First (OSPFv2 and OSPFv3)
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