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ES4626-SFP Management Guide.pdf

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The following simply outlines the route calculation process of OSPF protocol:<br />

1) Each OSPF-enabled layer3 switch maintains a database (LS database)<br />

describing the link-state of the topology structure of the whole autonomous<br />

system. Each layer3 switch generates a link-state advertisement according to its<br />

surrounding network topology structure (router LSA), and sends the LSA to other<br />

layer3 switches through link-state update (LSU) packages. Thus each layer3<br />

switches receives LSAs from other layer3 switches, and all LSAs combined to<br />

the link-state database.<br />

2) Since a LSA is the description of the network topology structure around a layer3<br />

switch, the LS database is the description of the network topology structure of<br />

the whole network. The layer3 switches can easily create a weighted vector map<br />

according to the LS database. Obviously, all layer3 switches in the same<br />

autonomous system will have the same network topology map.<br />

3) Each layer3 switch uses the shortest path finding (SPF) algorithm to calculate a<br />

tree of shortest path rooted by itself. The tree provides the route to all the nodes<br />

in the autonomous system, leaf nodes consist of the exterior route information.<br />

The exterior route can be marked by the layer3 switch broadcast it, so that<br />

additional information about the autonomous system can be recorded. As a<br />

result, the route table of each layer3 switch is different.<br />

OSPF protocol is developed by the IETF, the OSPF v2 widely used now is fulfilled<br />

according to the content described in RFC2328.<br />

17.6.2 OSPF Configuration Task List<br />

The OSPF configuration for Edge-core series switches may be different from the<br />

configuration procedure to switches of the other manufacturers. It is a two-step process:<br />

1、Enable OSPF in the Global Mode;<br />

2、Configure OSPF area for the interfaces.<br />

The configuration task list is as follows:<br />

1. Enable/disable OSPF protocol (required)<br />

(1)Enable/disable OSPF protocol (required)<br />

(2)Configure the ID number of the layer3 switch running OSPF (optional)<br />

(3)Configure the network scope for running OSPF (optional)<br />

(4)Configure the area for the interface (required)<br />

2. Configure OSPF protocol parameters (optional)<br />

(1)Configure OSPF package sending mechanism parameters<br />

1)Configure OSPF package verification<br />

2)Set the OSPF interface to receive only<br />

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