300-415: Implementing Cisco Catalyst SD-WAN Solutions

Individual applications are monitored per user through performance measurements, which reflect the quality of the application experience across the overlay network.

A Layer 3 TLOC extension requires dynamic routing between the WAN edge devices. vEdge102 must form BGP with vEdge101 at 172.1.1.2 and make its 172.1.1.1/30 link a tunnel interface using the restricted MPLS color. This provides reachability through vEdge101’s MPLS transport for vEdge102’s MPLS control connection. Cisco documents that Layer 3 TLOC extension requires a routing protocol between the SD-WAN devices and uses a tunnel interface for the extended TLOC.

The BFD multiplier specifies how many consecutive BFD packets may be missed before the path is considered down. For Cisco SD-WAN application-aware routing, the multiplier is 6.

A TLS forward proxy creates two distinct sessions—one between the client and the proxy, and one between the proxy and the server—before it can proxy TLS negotiation, apply decryption policy, and inspect the traffic.

A centralized control policy changes network-wide overlay routing by controlling the routes and TLOC information advertised by the Cisco SD-WAN Controller. A topology policy under Centralized Policy can create the required hub-and-spoke behavior, causing Barcelona-to-Paris traffic to traverse London rather than use the direct full-mesh path. Localized ACL, localized route, and centralized traffic policies do not define this overlay topology.