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Routing descriptor block how to6/12/2023 ![]() The Cisco IOS XE SD-WAN devices also have the capability of BGP MPLS VPN Option B. Extensions of the BGP protocol can be used to manage an MPLS path. MPLS offers an extremely scalable, protocol agnostic, data-carrying mechanism that transfers data packets with assigned labels across the network through virtual links. ![]() The Cisco IOS XE SD-WAN devices support Multiprotocol Label Switching (MPLS) to enable multiple protocol environment. So lets start with the 17.2.1r release notes on the matter. This could be accomplished using per-VRF interfaces (or sub-interfaces) and BGP peerings, but a neater solution is to pass all the routing information over one the BGP MPLS VPNv4 peering. What I am trying to achieve is to advertise the differing SD-WAN VPN (VRF, why Cisco have to call these VPNs beats me) prefixes to a core switch (using a ASR in the lab) directly connected to the SD-WAN router. This post goes through how to configure MPLS VPN on the service-side of a Cisco SD-WAN edge device, so the south-side towards non-SD-WAN devices.
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