Dell N3200-ON Networking N-Series Switches CLI Reference Guide version 6.8.0 - Page 1732

OSPF Commands Dell Networking N2200-ON/N3200-ON Series Switches The Dell Network N1500/N2200-ON series support limited routing and multicast capabilities. See the Users Configuration Guide section "Feature Limitations and Platform Constants" for supported capabilities. OSPF is a link-state protocol. Dell Networking OSPF supports variablelength subnet masks. Dell Networking OSPF only operates over VLAN interfaces. OSPF operates within a hierarchy. The largest entity within the hierarchy is the autonomous system (AS), a collection of networks under a common administration sharing a common routing strategy. This is sometimes called a routing domain. An AS can be divided into a number of areas or groups of contiguous networks and attached hosts. Routers within the same area share the same information, so they have identical topological databases. Information is sent in the form of link-state advertisements (LSAs) to all other routers within the same hierarchical area. An area's topology is not visible to routers outside the area. Two different types of OSPF routing occur as a result of area partitioning: Intra-area and Inter-area. Intra-area routing occurs if a source and destination are in the same area. Inter-area routing occurs when a source and destination are in different areas. An OSPF backbone distributes information between areas. For IPv4 networks, Dell Networking routing supports OSPF version 2 in accordance with RFC 2328. The Dell Networking routing also provides a compatibility mode for the RFC 1583 OSPF specification, which allows interoperability with OSPF version 2 routers using the older implementation. The Dell Networking OSFPv2 implementation supports point-to-point operation on Ethernet interfaces. The user can configure an OSPFv2 interface to run in broadcast or point-to-point mode. When there are only two routers attached to the link, OSPFv2 point-to-point mode has the advantage of not requiring designated router election or origination of a network LSA for the LAN. This makes the protocol more efficient. Dell Networking also supports OSPFv3 for use with IPv6 networks. The Dell Networking routing OSPF NSSA feature supports RFC 3101, The OSPF Not-So-Stubby Area (NSSA) Option. Layer 3 Routing Commands 1732