L is a network design engineer. In a certain network project, in order to reduce the complexity, L designed the network to adopt a two-layer architecture, and the functions of the access layer were incorporated into the aggregation layer. When designing, L considered that the core layer needs to have a fast convergence function, and the aggregation layer performs route aggregation to reduce the number of routes. Among the following routing protocols, which one should L use as the routing protocol at the aggregation layer? (Multiple choice)

L is a network design engineer. In a certain network project, in order to reduce the complexity, L designed the network to adopt a two-layer architecture, and the functions of the access layer were incorporated into the aggregation layer. When designing, L considered that the core layer needs to have a fast convergence function, and the aggregation layer performs route aggregation to reduce the number of routes. Among the following routing protocols, which one should L use as the routing protocol at the aggregation layer? (Multiple choice)
A . BGP
B. OSPF
C. RIP
D. IS-IS

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Answer: BD