MPLS Label Information Base

BD

MPLS (Multiprotocol Label Switching) is a networking technology that enables efficient and fast packet forwarding in complex networks. The MPLS label information base (LIB) is a crucial component of MPLS networks that stores information about the labels assigned to packets and the next-hop label forwarding information.

Regarding the statements given in the question:

A. The MPLS label information base is stored in the inet.3 table.

This statement is incorrect. The inet.3 table is used for storing BGP (Border Gateway Protocol) routing information, not MPLS label information. Therefore, option A is incorrect.

B. The MPLS label information base is stored in the mpls.0 table.

This statement is correct. The mpls.0 table is the default location for storing MPLS label information in Junos OS. The MPLS label information base contains the label bindings and the next-hop label forwarding information used by the Label Switching Routers (LSRs) in an MPLS network to forward packets. Therefore, option B is correct.

C. The label information base is used by all LSRs to forward LSP traffic.

This statement is partially incorrect. The label information base is used by all LSRs in an MPLS network, but it is used to forward labeled packets, not LSP (Label Switched Path) traffic. LSP is the path through the network that a packet takes when it is switched using MPLS labels. Therefore, option C is incorrect.

D. The label information base is used by transit LSRs to forward LSP traffic.

This statement is partially incorrect. The label information base is used by all LSRs in an MPLS network, not just transit LSRs. However, it is used to forward labeled packets, not LSP traffic. Therefore, option D is incorrect.

In summary, the correct statements regarding the MPLS label information base are:

• The MPLS label information base is stored in the mpls.0 table.
• The label information base is used by all LSRs in an MPLS network to forward labeled packets.