D-Link DGS-6600-48TS Configuration Guide - Page 218
OSPF Configuration Commands, Basic Commands and Functions
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Volume 4-Layer 3 Configurations / Chapter 23-Open Shortest Path First (OSPF) OSPF Configuration Commands • Summary LSA - Network (Type 3) • Summary LSA - ASBR (Type 4) • AS-External Route LSA (Type 5) • NSSA External Route LSA (Type 7) The LSAs used by OSPF carry out different roles. Type 1 and Type 2 LSAs are used to carry the intra-area routing information. Type 3 & Type 4 LSAs are used to carry the inter-area routing information. Type 5 and Type 7 LSAs are used to carry the external routing information. Type 4 LSAs give the routing information to the ASBR, which forwards packets destined for the external route. The stub area and the not-so-stubby area are special non-zero areas. A stub area does not see the external routes. Packets from the stub area destined for external networks will always be forwarded by the border router by a defined default route. A totally stubby area is a stub area that has the further restriction of not being able to see the inter-area routes. The not-so-stubby area is an extension of the stub area. A not-so-stubby area is more flexible than a stub area in that it can be connected to the external small domain, which allows the connected ASBR to import the external routes to the AS so that traffic destined for the external small domain can be transported. OSPF Configuration Commands Basic Commands and Functions The following topics are included in this section: • Specifying OSPF Network Areas • Specifying an OSPF Router-ID • Specifying an OSPF Router Priority • Specifying the OSPF Area Type • Specifying Passive Interfaces • Initiating OSPF Shutdown on a Specific VLAN Interface • Specifying the OSPF Cost on a VLAN Interface • Configuring OSPF Authentication • Configuring OSPF Timers • Configuring Area Host Route • Creating OSPF Virtual Links Specifying OSPF Network Areas To run OSPF, the user needs to enter the OSPF router configuration mode and specify the networks that will operate within the specified area. The interfaces that have been configured with subnets that are covered within the specified OSPF network will start the OSPF protocol operation. The area with an area ID of 0.0.0.0 or 0 will become area zero and the other areas will become non-zero areas. DGS-6600 Configuration Guide 218