Difference between a route and a gateway

The operation object of policy-based routing is packets. Even if a routing table is available, packets are not forwarded according to the routing table, and they are forwarded based on a policy according to requirements. According to the conventional routing and forwarding principle, packets are forwarded according to the destination addresses of the packets. Nowadays, more and more users expect that packets are forwarded and routed according to their defined policies on the basis of the conventional routing and forwarding. Policy-based routing enables the network administrator to formulate routing policies according to the source and destination addresses of packets, packet size, and link quality in order to change the forwarding paths of packets and meet user requirements.

The differences between static and dynamic routes are as follows: Static routes are easy to configure, have low requirements on the system, and apply to simple, stable, and small networks. The disadvantage of static routes is that they cannot automatically adapt to network topology changes. Therefore, static routes require subsequent maintenance. Dynamic routing protocols have their routing algorithms. Therefore, dynamic routes can automatically adapt to network topology changes and apply to the networks on which Layer 3 devices are deployed. The configurations of dynamic routes are complex. Dynamic routes have higher requirements on the system than static ones and consume network resources and system resources.

Static routes are easy to configure, have low requirements on the system, and apply to simple, stable, and small networks. The disadvantage of static routes is that they cannot automatically adapt to network topology changes. Therefore, static routes require subsequent maintenance. Dynamic routing protocols have their routing algorithms. Therefore, dynamic routes can automatically adapt to network topology changes and apply to the networks on which Layer 3 devices are deployed. The configurations of dynamic routes are complex. Dynamic routes have higher requirements on the system than static ones and consume network resources and system resources.

The primary NE is responsible for communication between the ASON network and U2000 server. It transmits information on the ASON control plane and reports ASON events to the U2000 server. An ASON domain can have only one primary NE and one secondary NE. A gateway NE is connected with the U2000 server using the TCP/IP protocol. Generally, an NE that is connected to the U2000 server through a LAN or WAN is a gateway NE. Multiple gateway NEs can be connected to the U2000 server. Generally, you can configure the primary or secondary NE as the gateway NE on an ASON network to leverage ECC bandwidth resources.