White Papers

Open Shortest Path First (OSPFv2 and
OSPFv3)
The Switch supports open shortest path first version 2 (OSPFv2) for IPv4 and version 3 (OSPFv3) for IPv6. Up to 16 OSPF
instances can be run simultaneously on the Switch.
OSPF is an Interior Gateway Protocol (IGP), which means that it distributes routing information between routers in a single
Autonomous System (AS). OSPF is also a link-state protocol in which all routers contain forwarding tables derived from
information about their links to their neighbors.
The fundamental mechanisms of OSPF (flooding, DR election, area support, SPF calculations, and so on) are the same for
OSPFv2 and OSPFv3. OSPFv3 runs on a per-link basis instead of on a per-IP-subnet basis.
This chapter is divided into two sections. There is no overlap between the two sets of commands. You cannot use an OSPFv2
command in the IPv6 OSPFv3 mode.
● OSPFv2 Commands
● OSPFv3 Commands
Topics:
• OSPFv2 Commands
• area default-cost
• area nssa
• area range
• area stub
• auto-cost
• clear ip ospf
• clear ip ospf statistics
• debug ip ospf
• default-information originate
• default-metric
• description
• distance
• distance ospf
• distribute-list in
• distribute-list out
• fast-convergence
• flood-2328
• graceful-restart grace-period
• graceful-restart helper-reject
• graceful-restart mode
• graceful-restart role
• ip ospf auth-change-wait-time
• ip ospf authentication-key
• ip ospf cost
• ip ospf dead-interval
• ip ospf hello-interval
• ip ospf message-digest-key
• ip ospf mtu-ignore
• ip ospf network
• ip ospf priority
• ip ospf retransmit-interval
• ip ospf transmit-delay
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794 Open Shortest Path First (OSPFv2 and OSPFv3)