Configuration manual

• If multiple OSPF interfaces provide communication between two routers, after you configure helper-
reject on one interface, all other interfaces between the two routers behave as if they are in the help-
reject role.
• OSPFv2 and OSPFv3 support planned-only and/or unplanned-only restarts. The default is support for
both planned and unplanned restarts.
A planned restart occurs when you enter the redundancy force-failover rpm command to
force the primary RPM to switch to the backup RPM. During a planned restart, OSPF sends out a
Grace LSA before the system switches over to the backup RPM.
An unplanned restart occurs when an unplanned event causes the active RPM to switch to the backup
RPM, such as when an active process crashes, the active RPM is removed, or a power failure happens.
During an unplanned restart, OSPF sends out a Grace LSA when the backup RPM comes online.
To display the configuration values for OSPF graceful restart, enter the show run ospf command for
OSPFv2 and the show run ospf and show ipv6 ospf database database-summary commands
for OSPFv3.
Fast Convergence (OSPFv2, IPv4 Only)
Fast convergence allows you to define the speeds at which LSAs are originated and accepted, and reduce
OSPFv2 end-to-end convergence time.
The Dell Networking OS allows you to accept and originate LSAa as soon as they are available to speed
up route information propagation.
NOTE: The faster the convergence, the more frequent the route calculations and updates. This
impacts CPU utilization and may impact adjacency stability in larger topologies.
Multi-Process OSPFv2 (IPv4 only)
Multi-process OSPF is supported on OSPFv2 with IPv4 only.
Multi-process OSPF allows multiple OSPFv2 processes on a single router. Multiple OSPFv2 processes
allow for isolating routing domains, supporting multiple route policies and priorities in different domains,
and creating smaller domains for easier management.
The MXL Switch supports up to 16 OSPFv2 processes.
Each OSPFv2 process has a unique process ID and must have an associated router ID. There must be an
equal number of interfaces and must be in Layer-3 mode for the number of processes created. For
example, if you create five OSPFv2 processes on a system, there must be at least five interfaces assigned
in Layer 3 mode.
Each OSPFv2 process is independent. If one process loses adjacency, the other processes continue to
function.
Processing SNMP and Sending SNMP Traps
Though there are may be several OSPFv2 processes, only one process can process simple network
management protocol (SNMP) requests and send SNMP traps.
The mib-binding command identifies one of the OSPVFv2 processes as the process responsible for
SNMP management. If you do not specify the mib-binding command, the first OSPFv2 process created
manages the SNMP processes and traps.
Open Shortest Path First (OSPFv2 and OSPFv3)
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