Forwarding Label Distribution in Unified MPLS
Question
In Unified MPLS, which protocol does the forwarding label distribution?
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Explanations
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Unified MPLS is a service provider architecture that enables the use of MPLS across the entire network, from the core to the edge, and across multiple service types. The forwarding label distribution in Unified MPLS is achieved using one of several protocols, including RSVP, BGP, IGP such as IS-IS or OSPF, and LDP.
Among these protocols, LDP (Label Distribution Protocol) is typically used for forwarding label distribution in Unified MPLS. LDP is a protocol that is used to distribute labels between MPLS-enabled routers and is the most commonly used protocol for label distribution in MPLS networks. LDP uses a downstream unsolicited label distribution method in which the label mapping is sent from the upstream router to the downstream router without the downstream router explicitly requesting it. This method allows for a more efficient and scalable distribution of labels in MPLS networks.
BGP (Border Gateway Protocol) can also be used for forwarding label distribution in Unified MPLS. BGP is typically used to distribute labels in MPLS networks that support VPN services. BGP can be used to distribute VPN labels or MPLS labels for traffic engineering purposes.
IGP (Interior Gateway Protocol) protocols such as IS-IS or OSPF can also be used for forwarding label distribution in Unified MPLS. IGP protocols can be used to distribute labels in MPLS networks that support traffic engineering. However, IGP protocols are less commonly used for label distribution in MPLS networks as they are less efficient and scalable than LDP.
Finally, RSVP (Resource Reservation Protocol) can also be used for forwarding label distribution in Unified MPLS. RSVP is typically used for traffic engineering purposes and can be used to distribute labels for traffic engineering tunnels. However, RSVP is less commonly used for label distribution in MPLS networks as it is less efficient and scalable than LDP.
In summary, while multiple protocols can be used for forwarding label distribution in Unified MPLS, LDP is the most commonly used and efficient protocol for this purpose.
