140
Obviously, all layer3 switches in the same autonomous system will have the same network
topology map.
c) 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.
OSPFv3 protocol is developed by the IETF, the OSPF v3 used now is fulfilled according to
the content described in RFC2328 and RFC2740.
As a result of continuous development of IPv6 network, it has the network environment of
nonsupport IPv6 sometimes, so it needs to do the IPv6 operation by tunnel. Therefore, our
OSPFv3 supports configuration on configure tunnel, and passes through nonsupport IPv6
network by unicast packet of IPv4 encapsulation.
1.7.2 OSPFv3 Configuration Task List
1.
Enable OSPFv3 (required)
（
1
）
Enable/disable OSPFv3(required)
（
2
）
Configure the router-id number of the layer3 switch running OSPFv3 (optional)
（
3
）
Configure the network scope for running OSPFv3 (optional)
（
4
）
enable OSPFv3 on the interface (required)
2.
Configure OSPFv3 auxiliary parameters (optional)
（
1
）
Configure OSPFv3 packet sending mechanism parameters
1)
Set the OSPFv3 interface to receive only
2)
Configure the cost for sending packets from the interface
3)
Configure OSPFv3 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 OSPFv3 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 OSPFv3
（
3
）
Configure OSPFv3 importing the routes of other OSPFv3 processes
1)
Enable the function of OSPFv3 importing the routes of other OSPFv3 processes
2)
Display relative information
3)
Debug
（
4
）
Configure other OSPFv3 protocol parameters
1)
Configure OSPFv3 routing protocol priority
2)
Configure cost for OSPFv3 STUB area and default route