
Frame Relay Overview
117376-A Rev. A 2-11
Source Routing
Source routing is the method by which a bridge sends data across two networks.
The router supports source routing over frame relay networks, using RFC 1490
standard frame relay data encapsulation.
To configure source routing, see Configuring Bridging Services.
RFC 1490
RFC 1490 defines the encapsulation method for sending data across a frame relay
network. Bay Networks routers implement RFC 1490 for all protocols that we
support over frame relay networks.
Address Resolution
Address resolution maps a remote network address such as an IP address to a local
DLCI number. For most protocols that you configure for a frame relay interface,
the router performs address resolution automatically. However, IP, AppleTalk, and
VINES
use the Address Resolution Protocol (ARP). ARP dynamically generates
an ARP table of addresses and DLCI numbers by sending messages back and
forth to each network node to gather address information. This process increases
broadcast traffic across the network.
To reduce broadcast traffic for all protocols, you can configure static routes and
adjacent hosts at the protocol level. This eliminates the need for the router to
perform address resolution. To reduce traffic associated specifically with VINES
address resolution, you can configure Inverse ARP. Inverse ARP is the default for
IP over frame relay. Refer to the appropriate protocol manual for more
information about static routes, adjacent hosts, and Inverse ARP.
Table 2-1 lists how the router handles address resolution for each protocol and
whether or not you can reduce broadcast traffic by modifying the address
resolution configuration.
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