89
3
）
Each layer3 switch uses the shortest path first (SPF) algorithm to calculate a tree of
shortest path rooted by itself. The tree provides the route to all the nodes in the
autonomous system, leaf nodes consist of the exterior route information. The exterior
route can be marked by the layer3 switch broadcast it, so that additional information
about the autonomous system can be recorded. As a result, the route table of each
layer3 switch is different.
OSPF protocol is developed by the IETF, the OSPF v2 widely used now is fulfilled according
to the content described in RFC2328.
1.6.2 OSPF Configuration Task List
The OSPF configuration for Edge-core series switches may be different from the configuration
procedure to switches of the other manufacturers. It is a two-step process:
1
、
Enable OSPF in the Global Mode;
2
、
Configure OSPF area for the interfaces.
The configuration task list is as follows:
1. Enable/disable OSPF protocol (required)
（
1
）
Enable/disable OSPF protocol (required)
（
2
）
Configure the ID number of the layer3 switch running OSPF (optional)
（
3
）
Configure the network scope for running OSPF (optional)
（
4
）
Configure the area for the interface (required)
2. Configure OSPF protocol parameters (optional)
（
1
）
Configure OSPF packet sending mechanism parameters
1
）
Configure OSPF packet verification
2
）
Set the OSPF interface to receive only
3
）
Configure the cost for sending packets from the interface
4
）
Configure OSPF packet sending timer parameter (timer of broadcast interface sending
HELLO packet to poll, timer of neighboring layer3 switch invalid timeout, timer of LSA
transmission delay and timer of LSA retransmission.
（
2
）
Configure OSPF route introduction parameters
1
）
Configure default parameters (default type, default tag value, default cost
2
）
Configure the routes of the other protocols to introduce to OSPF
（
3
）
Configure OSPF importing the routes of other OSPF processes
1) Enable the function of OSPF importing the routes of other OSPF processes
2) Display relative information
3) Debug
（
4
）
Configure other OSPF protocol parameters
1
）
Configure OSPF routing protocol priority