BGP-LS

Prelude TE peers with your network over BGP-LS to learn the Link-State database your IGP carries. Everything in the consolidated topology comes from this single source — there is no other ingestion path.

A few things are worth knowing before you configure your first peers:

• Prelude TE is a passive consumer of BGP-LS. It receives Link-State NLRIs and never re-advertises them. Your network will not see Prelude TE inject anything into its routing.
• It opens BGP sessions outbound by default. When you add a peer record, Prelude TE initiates the TCP connection to the peer's address. You can flip the Passive mode toggle in Settings if you prefer to only accept inbound sessions — useful when a corporate firewall makes outbound BGP awkward.
• You can peer with as many speakers as your license allows. Every contributing peer feeds the same consolidated topology, with per-peer attribution on every node, link, and prefix so the engine knows what to keep when one of them disappears. See Peer redundancy for redundancy patterns.

Where to go next

• Peers — adding, editing, enabling, and removing peers from the web UI.
• Authentication — how to configure MD5 between Prelude TE and your routers.
• Peer redundancy — recommended patterns when pairing peers for redundancy.