Chapter 8. IP Routing
Chapter 8
IP Routing
IP ROUTING WITH THE FSU
The FSU contains an IP router function to resolve paths for IP packets received. This function is used regardless of encapsula- tion protocol and port received from.
The heart of the routing system is a routing table which can be generated manually, automatically, or a combination of the two. Manual entry is preferred in cases where there are few routes. This minimizes traffic created by routing protocols used in the automatic method. The automatic method cuts down on manual entry for large route tables and allows for routes to be changed without service interruption.
Another important element in routing is the default gateway route. This is used while routes are being formed automatically and is a convenient way to direct all IP packets in cases where only one route is needed.
Routing internet protocol (RIP) can be enabled for each port configured for IP encapsulation. The Tx RIP parameter enables the FSU to share the internal routing table with other routers and FRADs attached to the port. The Rx RIP parameter enables the FSU to process routing table information from other routers and FRADs attached to the port.
In addition to RIP, the network port uses inverse ARP (RFC 1490) to associate peer router/FRAD IP addresses to PVC addresses.
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