Juniper VPLS技术简介.pptVIP

Updated 6/May/2002 Juniper Networks, Inc. Copyright ? 2003 - Proprietary Confidential Virtual Private LAN ServiceTechnical Overview Hector Avalos Elise Gerich Mike Capuano May 2003 Virtual Private LAN Service A private Ethernet network constructed over a ‘shared’ infrastructure which may span several metro areas Multipoint to Multipoint Ethernet connectivity where the SP network looks like an Ethernet broadcast domain Compliments Layer 3 2547 and Layer 2 VPNs VPLS Acronyms Tunnel (PE to PE) RSVP-TE, ‘Normal’ LDP, GRE, IPSec .. May be used for many services: IPv4 VPN, IPv6 VPN, L2 VPN, 6PE, VPLS.. May be provisioned independent of VPLS Demultiplexor, Virtual Channel Identifier, VC Label, Inner Label Identifies the VPLS to which a packet belongs to, as well as the ingress PE VPLS Instance : bridging instance residing at the PE VPLS Domain : VPN VPLS Operations Control Plane VPN Discovery Discover who are the PE members of a given VPN VPN Signaling Setup and teardown of the pseudo-wires between VPLS instances that constitute the VPLS Domain Forwarding Plane MAC Learning and Packet Forwarding MAC Aging MAC Flushing VPLS Signalling Auto-discovery VPLS Operations Control Plane VPN Auto-Discovery Auto-discovery can be done by BGP IETF proposals to extend DNS or RADIUS for auto-discovery VPN Signaling Demultiplexors can be signaled by targeted LDP (draft-lasserre-vkompella-ppvpn-vpls) O(N^2) LDP sessions operational challenge by BGP (draft-kompella-ppvpn-vpls) A single MP-BGP LNRI supports both Auto-Discovery and Signaling Using two different protocols for Auto-discovery Signaling More complex to debug More complexity and inter-protocol interactions More protocol state in the network BGP already does both Auto-discovery Signaling IP VPN services (aka RFC2547 VPN) RFC2547, draft-ietf-ppvnp-2547bis BGP for VPN auto-discovery draft-ietf-ppvpn-bgpvpn-auto IPv6 VPN draft-ietf-ppvpn-bgp-ipv6-vpn-03.txt Extensions to RFC 2547bis to support IPv6 VPNs Virtual Private LAN