RFC2091

Other than in the LAN, WAN bandwidth limitations may make regular updates every 30 seconds undesirable. For this reason, RFC 2091 requires that routes are transmitted to the WAN once only when the connection is established. After this, updates only are transmitted (triggered updates).

Because updates are explicitly requested here, broadcasts or multicasts are not to be used for delivering RIP messages. Instead, the the subsidiary device must be statically configured with the IP address of the next available router at the central location. Due to these requests, the central router knows which subsidiary routers it has received update requests from; it then sends any messages on route changes directly to the subsidiary device.

Note: In a central gateway, the setting "RFC 2091" can always be off and the "Gateway" entry always set to 0.0.0.0 because the central gateway always considers the gateway as specified at the subsidiary.
SNMP ID:
2.8.8.4.8 
Telnet path:
Setup > IP-Router > RIP > WAN-Sites
Possible values:
On
Off
Default:
Off

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