Backbone Area: It is also known as area0 or area 0.0.0.0; it forms the very core of an OSPF network, and all other areas of the network are connected to the backbone area. It is responsible for distributing routing information between areas that are not backbone area types. Stub Area: ...
Type5-External LSA Type4-ASBR Summary Type7-NSSA External Summary 特殊区域 Stubby area Totally Stubby area Not So Stubby area(NSSA) Totally NSSA 路径选择 OSPF路由类型 实验模拟 总结 路由汇总 定义 域间路由汇总 实验模拟(域间) 外部路由汇总 实验模拟(外部) 原理 三张表 这三张表对应建立路由的三大...
(1)Type 1: Router LSA (2)Type 2: Network LSA (3)Type 3: Summary LSA Type 3 LSAs用于将本区域产生的LSA 信息泛洪道其它区域:描述链路的网络号和掩码。 由起始区域的ABR产生并通告。 Type 3 LSAs被其它的ABR泛洪到整个自治系统。 默认情况下,路由不进行汇总。类型3 LSA将通告到每个子网。 (4)Type ...
OSPF ASBR Summary LSA (Type 4) OSPF Router LSA (Type 1) Router LSA (Type 1) is the LSA type used in standard areas. The aim of this LSA type is giving information about the router. This LSA includes information like Router ID, Router interfaces, neighbors, ip addresses and cost. Route...
Totally Stub areas prevent both Type-5 and Type-3 (Inter Area) LSAs from being flooded into them. This means in all area types Intra-area LSAs (Type-1 and Type-2) are flooded. You will see a Type-2 LSA for every broadcast segment contained in the area and a Type-1 LSA for all ...
Use the OSPF router configurationarea xx stub no-summarycommand in order to define a totally stub area. In the previous network diagram, routers in area 7 do not need to know about all external destinations or any summary LSA from the backbone for other areas. The routers in area 7 must ...
At the end ,in OSPFv3 's LSA Type 5,the Forward Address does not appear because it is now optional.The forwarding address is present in the AS-external-LSA if and only if the AS-external-LSA's bit F is set. To ensure the reachability of an ASBR into other areas, the ABR R2 crea...
Inter-Area-Prefix-LSA Originated by an ABR, an inter-area-prefix-LSA (Type 3) describes routes to an IPv6 address prefix within the local area, and is advertised to other related areas. Figure 6-11 shows the format of an inter-area-prefix-LSA. Figure 6-11 Format of an inter-area-pr...
Therefore, OSPF requires that all non-backbone areas be directly connected to the backbone area and devices within the backbone area keep connected as well. However, these requirements may not be met due to various limitations. OSPF virtual links can be configured to solve the problem. Follow-...
An Area Border Router (ABR) is located between two different areas, while Autonomous System Border Router (ASBR) is located between is located between devices using other routing protocols. 5. Choose theOSPF roleas eitherInternal,ABR, ASBR, andABR and ASBR. ...