Shulou(Shulou.com)06/01 Report--

Reasons for generating OSPF Multiregions

1. Improve the extensibility of the network

two。 Fast convergence

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Capacity of the OSPF area

1. Intra-domain traffic

two。 Inter-domain traffic

3. External traffic

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Type of OSPF router

1. Internal router

two。 Area Border Router (ABR)

3. Homemade system Border Router (ASBR)

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Link-state advertisement

Type of LSA

1.LSA1: router LSA, each router running the ospf routing protocol generates router LSA advertisements.

You can view lsa information through the command show ip ospf database router

You can view the lsa of each router by using the command show ip ospf database router id

2.LSA2: network LSA advertisements are generated by designated routers in a multi-fingered network

You can view it through the command show ip ospf database network.

3.LSA3: the network summary LSA, which is initiated by the ABR router, sends the network summary LSA to an area and is used to pass through the destination address outside that area.

You can view it through the command show ip ospf database summary.

4.LSA4: ASBR summary LSA

You can view it through the command show ip ospf asbr-summary.

5.LSA5: external LSA of autonomous system

You can view information about the external lsa of as by using the command show ip ospf database external.

6.LSA6

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Show ip route

Show ip route ospf / / View routes learned by ospf / /

Show ip protocol / / View ospf protocol configuration information / /

Show ip ospf / / View how ospf is configured on the router and ABR information / /

Show ip ospf database / / View all LSA information in LSDB / /

Clear ip route

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Router selection of routing entries

1. When the router receives a route entry with the same destination address, it first compares the administrative distance and selects a route entry with a small administrative distance to add to the route entry. If the administrative distance is the same as that long to compare the metric, choose the smaller one.

two。 When the router receives the same destination address, administrative distance, and metric, a load balancing is formed in the routing table.

Note that intra-domain routing takes precedence over interdomain routers.

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The administrative distance of static routes is 1 by default, and the metric is 0.

The administrative distance of RIP protocol is 120 by default, and the metric is hop count.

The administrative distance of the OSPF protocol is 110 by default, and the metric is the cost of the interface cost.

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Configuration of stub area

Everything else is the same, just add an order.

Area process number stub

Configuration of complete stub area

Configure a command on ABR interarea routing

Area process number stub no-summary / / close ABR to send summary link advertisements to the full stub area / /

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