What must be configured on the Nokia 7750 SR for RIP to advertise locally attached links?

On Nokia's Service Router Operating System (SR OS), routing protocols do not advertise or redistribute routes by default. To control which routes are advertised from the router's routing table into a specific protocol like RIP, an export policy must be explicitly configured and applied. To advertise locally attached links, a policy statement must be created that matches routes learned via the 'direct' protocol (i.e., local interface routes) and contains an 'accept' action. This policy is then applied to the RIP process using the export command, enabling the advertisement of these specific links to RIP neighbors.

B. Access-lists denoting what is to be advertised: In SR OS, access lists (ACLs) are primarily used for packet filtering and security, not for controlling route advertisements within routing protocols.
C. Default metrics for each link: While metrics are fundamental to RIP's operation, configuring a metric does not enable the advertisement of a route. The policy is what permits the advertisement itself.
D. A group and neighbor statement for each peer: This configuration enables the RIP process on an interface to form adjacencies and exchange updates, but it does not control which routes are placed into those updates.

1. Nokia 7750 SR OS Routing Protocols Guide, Release 21.10.R1, Document Number: 3HE 17274 AAAB TQZZA, Section: Exporting Routes into RIP: "By default, routes from other protocols are not exported into RIP. Export policies are used to control which routes are exported from the route table into RIP. If no export policy is specified, non-RIP routes are not exported from the routing table to RIP." This confirms that a policy is mandatory for advertisement.

2. Nokia 7750 SR OS Routing Protocols Guide, Release 21.10.R1, Document Number: 3HE 17274 AAAB TQZZA, Section: Basic RIP Configuration: The configuration example demonstrates the creation of a policy-statement to export direct routes and its application under the router rip context with the export "policy-name" command. This shows the practical implementation required.

3. Nokia SR OS Router Configuration Guide, Release 21.10.R1, Document Number: 3HE 17275 AAAB TQZZA, Section: Routing Policy Overview: "Routing policies allow you to control the size and content of the routing tables, control the routes that are advertised, and choose the best path to a destination." This establishes the role of policy statements as the primary tool for controlling route advertisement.