For link-status routing protocols, filtering routes in the inbound direction actually cannot block the transmission of link-status information. The filtering effect is that routes cannot be injected into the local routing table but neighbors can still receive complete route status information and calculate complete routes.

Question

Quizplus · Accepted Answer

Link-state routing protocols share the entire network topology with all routers, so filtering routes inbound affects only the local routing table, not the link-state information shared with neighbors.

For Link-Status Routing Protocols, Filtering Routes in the Inbound Direction