Rd and RT (mpls vpn bgp)
Rd (route-distinguisher) is used to identify different VPN instances on the PE device. Its main function is to achieve address multiplexing between VPN instances. It and the IP address constitute a 12byte vpnv4 address space, rd and the route are carried together in the bgp update message and published to the peer end. On the one hand, we
Bgp mpls/VPN Network Technology BGP protocol has been well known for a long time. Its powerful routing policy tool capabilities and its storage and routing performance go beyond any internal gateway protocol of the image model, therefore, it exists as a "bridge" between autonomous systems. before that, there was an EGP protocol, and few people knew it, because it
MPLS + BGP advanced featuresWill LDP allocate tags for BGP routes? Why? --- Previously we mentioned that LDP assigns tags to IGP and never assigns tags to BGP. the following uses an experiment to illustrate how LDP + BGP works. forwarding method of a pure IP Network: In this
In the previous article, we introduced MPLS technology. Many protocols have been applied in this Multi-Protocol Label technology. Today we will introduce the BGP protocol. Let's see how BGP works in MPLS. The specific application of the BGP protocol in
In March 1999, the Internet Task Force (IETF) published a RFC2547 by Cisco, describing a way for operators to provide virtual private network (VPN) services to users through an IP backbone network. This method uses an extended BGP (Boundary routing protocol) to distribute VPN routing information through the carrier backbone network, and uses Multiprotocol token switching (MPLS) to forward VPN traffic betwee
Absrtact: Broadband IP metropolitan Area network, routing planning and design is the core link. In the beginning of the network, must be integrated planning. According to the construction of the metropolitan area Network, the routing strategy based on Bgp/mpls VPN is adopted, which is proved to be feasible by practice.
Key words: BGP
VPN instance changes, the changed PE device should take the initiative to send the BGP refresh packet to refresh the VPN route, and use the new RT attribute to filter the route.
Different from RD, We can configure multiple RT attributes for a VPN instance, and the RT attributes are released in the extended group attributes of the bgp update message. The format is similar to that of common group attributes.
BGP/MPLSVPN Concept 1: VRF
One of the security measures of BGP/MPLSVPN is routing isolation and information isolation. It is implemented through the VPN route Forwarding (VPNRouting Forwarding: VRF) Table and LSP in MPLS. On a PE router, there are multiple BGP/MPLSVPN concepts 1: VRF tables, which correspond to one or
Protocol) or BGP and so on are combined to allocate tags between the edge and the core device to establish a tag switching path. Currently, the MPLS workgroup uses both methods. Although it is often a positive choice, there are two standards to solve the same problem, which will obviously bring about serious interoperability problems. Many vendors also find themselves shouldering the burden of implementing
Mpls vpn L3 PE-CE static explanationL3 mpls vpn static CE route configuration: -- 1. IGP is deployed between P and PE devices to ensure that the loopback address is reachable. -- 2. Deploy LDP, IGP, and LDP between P and PE devices for Label Distribution of backbone networks. IGP ensures that the loop ports between PES can be reached, so that LDP can work normally. -- 3, PE equipment between establish MP-
modification, the router that supports label switching is LSR (Label Switch Router), and the ATM switch that supports MPLS is generally called atm-LSR.
The architecture of the LSR device is as follows:
The architecture of LSR is divided into two parts:
1. Control Plane)
The function of this module is to exchange layer-3 routing information with other LSR to establish a route table, and to exchange the binding information of labels t
, etc ). multiple tags are shown in. the MTU is extended due to the introduction of tags. the label length is 4 bytes. According to CISCO's suggestion, the system MTU is set to 1524. If the label is encapsulated over Ethernet, the 24-byte label can carry the insertion of 6 labels, generally, the six labels are suitable for almost all applications. A topological environment composed of the following six routers is an experimental diagram of this part.R1 (IPS1) and R2 (Border1) are EBGP neighbors,
S8016 high-end vro switches provide VPN services for users based on the operating MPLS network, including layer-2 and layer-3 mpls vpn, and provide complete solutions for enterprise interconnection of different scales and scopes.
I. S8016 L3 VPN Function
MPLS/bgp vpn can provide a network-based VPN for net
-BGP: The ordinary IGP protocol can only carry IPV4 messages, obviously it is not enough, because we already know that need a protocol to host the VPN message, perhaps in other areas also need to host the IPV6 message, MP-BGP message was born to solve this problem. It is used to host the VPN message that is transmitted in the carrier network and carry some necessary extended attributes, such as Rt.
traditional routing protocols (such as OSPF, BGP, and PIM ). These routing protocols provide LSR with the ing between FEC and the next hop address.Distribution)The entries in the logo exchange forwarding table should at least provide the output port information and the next new logo. Of course, more information can be included. For example, it can generate an output queue principle for the switched group. The input group must have a unique entry corr
I won't talk about the configuration. Read the previous blog!1. propagation of CE and pe vrf private networksThe IPV4 route in the CE global route table is transmitted to the corresponding VRF route table of PE through the routing protocol (such as RIP, OSPF, OSPF, and BGP) between PE-CE. On PE, the routing protocol (Routing Protocol process or routing protocol instance) for routing exchange with CE must be bound to the corresponding VRF. On the bound
Network Based on BSTDX. The Fluid Signaling feature of TMX 880 enables service providers to support full network transparency on the runtime, transmission, and QoS layers.Proven carrier-level reliability and performance In terms of structure, TMX 880 supports public device redundancy and distributed processing, with 99.999% availability for cards, chassis, and power modules. TMX 880 supports redundant routing control processor (RCP) to take over the main processor function when the main process
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