The command vpls 9000 customer 6 create is used to instantiate a Virtual Private LAN Service (VPLS) on a Nokia router. The number immediately following the vpls keyword, which is 9000, serves as the service-id. This is a locally significant identifier for the service on the router.

For VPLS signaling (using either LDP or BGP), a vc-id (Virtual Circuit ID) is required, which must be unique for a specific VPLS instance across all participating Provider Edge (PE) routers. In the Nokia SR OS, if the vc-id is not explicitly configured, it defaults to the service-id. Therefore, the value 9000 will be used as the vc-id by default, and it is a critical best practice to ensure this identifier is unique for this specific VPLS service across the network to prevent service conflicts.

A. The customer-id is explicitly defined by the customer 6 part of the command, making the customer ID 6, not 9000.

D. The vc-id defaults to the service-id (9000), not the customer-id (6). The customer ID is for administrative and billing purposes.

E. The egress vc-label is a 20-bit MPLS label allocated dynamically and signaled via LDP or BGP; it is not the service-id value itself.

1. Nokia 7750 SR OS Services Architecture Guide, Release 21.10.R1, Document ID: 3HE 17112 AAAC TQZZA 01

Section: VPLS Services > VPLS Service Overview: "A VPLS service is configured on each participating PE router with a service-id that identifies the VPLS service on the router." (This supports Answer B).

Section: VPLS Services > VPLS Management > VPLS IDs: "The VPLS ID (also referred to as the VC ID) is a unique value for a VPLS service that is used in the signaling... The VPLS ID must be the same on all PE routers for the same VPLS service." (This supports the reasoning for Answer C).

Section: VPLS Services > Service SDPs: "If a vc-id is not specified for a mesh SDP, the service-id of the VPLS is used." (This confirms that the service-id becomes the vc-id by default, reinforcing the importance of its uniqueness as stated in Answer C).

2. Nokia 7450 ESS, 7750 SR, 7950 XRS, and VSR Layer 2 Services and EVPN Guide: VLL and VPLS, Release 21.10.R1, Document ID: 3HE 17111 AAAC TQZZA 01

Section: VPLS Command Reference > Basic VPLS Configuration Commands > vpls: "Syntax: vpls service-id [customer customer-id] [name service-name] create". This command syntax explicitly shows that the number following vpls is the service-id and the number following customer is the customer-id. (This supports Answer B and refutes Answer A).