Summary Link to AS Boundary Router LSA The previous advertisement lets every router know the cost to reach all of the networks inside the autonomous system. But what about a network outside the autonomous system? If a router inside an area wants to send a packet outside the autonomous system, it should first know the route to an autonomous boundary router; the summary link to AS boundary router provides this information. The area border routers flood their areas with this information (see Figure 11.42). This packet is used to announce the route to an AS boundary router. Its format is the same as the previous summary link. The packet just defines the network to which the AS boundary router is attached. If a message can reach the network, it can be picked up by the AS boundary router. The format of the packet is shown in Figure 11.43. The fields are the same as the fields in the summary link to network advertisement message.
đang được dịch, vui lòng đợi..