bgp multihoming

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 was not widely used, and it is not used by t

1. Route Selection Protocol The core of routing protocol is routing algorithm, the router uses routing protocol to generate routing table, which can realize the "best" path of the network packets. 2. Classification of routing protocols Routing protocol is divided into internal Gateway Protocol IGP and External Gateway protocol EGP two kinds. The internal gateway protocol is used in the autonomous system's internal routing, the external gateway protocol is used in the autonomous system routi

In the IGP era, we all know, for example, OSPF, link state protocol, in the routing of the time, than the cost of the link, which link consumption will be more priority, if two of the same link consumption, then do load balancing. In fact, the 2 principles to achieve the OSPF---shortest path first work principle. What if, in BGP, there are multiple routes to achieve the goal, how should the choice be made? Which path is the preferred one? Take a lo

BGP protocol-neighbor PMTU checks that the BGP protocol runs on TCP, so the TCP parameter settings will affect the performance of BGP. When the number of routes is small, the adjustment of TCP Parameters may not affect the BGP performance. However, when the number of routes is large, the adjustment of TCP Parameters ca

Cisco ios xr bgp Packet Processing Denial of Service Vulnerability Release date: 2010-08-30Updated on: 2010-08-31 Affected Systems:Cisco ios xr 3.4.0-3.9.1Description:--------------------------------------------------------------------------------Cve id: CVE-2010-3035 Cisco ios xr is an operating system with self-protection and self-repair functions used in Cisco network devices. The BGP feature of Cisc

BGP Route update timer analysis defines the BGP Route update timer on RFC4271 of BGP. This timer can only work for routes with the same prefix of the same address family, its main function is to prevent a route in the network from fluctuating too frequently, and it is also a protection for the CPU. It may be too obscure to describe this feature in text, so we wil

address 4::4/64IPv6 OSPF area 0 Interface serial0/0IPv6 address 2000:34::4/64IPv6 OSPF Area 0Interface SERIAL0/1IPv6 address 2000:45::4/64IPv6 OSPF Area 0IPv6 router OSPF 110Router-id 4.4.4.4R5 ConfigurationIPv6 unicast-routingInterface Loopback0IPv6 address 5::5/64IPv6 OSPF Area 0Interface SERIAL0/1No IP addressIPv6 address 2000:45::5/64IPv6 router OSPF 110Router-id 5.5.5.53. Configure BGPR1 ConfigurationRouter BGP 1No synchronizationBGP Router-id 1

650) this. width = 650; "src =" http://www.bkjia.com/uploads/allimg/131227/0435456332-0.jpg "title =" BGP Route reflector RR configuration extension diagram. JPG "alt =" 160508473.jpg"/> R1: Configuration En Conf t Int lo 0 Ip add 1.1.1.1 255.255.255.0 No shut Exit Int s0/0 Ip add 12.12.12.1 255.255.255.0 No shut Clock rate 64000 Exit Router VPN 1 No auto-summary Network 12.12.12.0 255.255.255.0 Network 1.1.1.0 255.255.255.0 Exit Router

With the development of technology, the BGP cloud host technology is becoming more and more mature. The cloud computing technology of BGP cloud hosts integrates cloud computing resources with mainstream website creation software programs on the Internet, helps small and medium-sized entrepreneurs lower their entrepreneurial thresholds and build an ecological chain for Internet entrepreneurs.BGP is a routing

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 between the VPN user sites. The main purpose of thi

-if) #inter f1/0 R1 (config-if) #ip Router ISIS R1 (config-if) #inter Loop 0 R1 (config-if) #ip Router ISIS R1 (config-if) #router BGP 65001 BGP AS65001 R1 (config-router) #bgp Router-id 1.1.1.1 BGP routing ID R1 (config-router) #neighbor 2.2.2.2 remote-as 65001 establish a neighbor relationship R1 (config-route

BGP Extended Communities for OSPF PE-CE Routing-domain ID analysis to make OSPF Routing characteristics can pass through the mpls vpn backbone network, it needs to define some BGP Extended group attributes. OSPF attributes that can be passed through mp bgp include:The extended attribute of mp bgp allows OSPF routes to

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 need to verify whether the RD function is implemented, whether the PE device can achieve IP address reuse based on

BGPIs the routing protocol used to connect to an independent system on the Internet. It is an enhanced, comprehensive, and scalable protocol developed by the Internet Engineering Task Group. BGP4 supports the CIDR addressing scheme, which increases the number of available IP addresses on the Internet. BGP was designed to replace the original external gateway protocol EGP and is also considered a path vector protocol. The reflector configuration proces

1.1.1.1Log-adjacency-changesNetwork 1.1.1.0 0.0.0.255 Area 0Network 14.1.1.0 0.0.0.255 Area 0Router BGP 4No synchronizationBGP Router-id 1.1.1.1Neighbor 4.4.4.4 Remote-as 4Neighbor 4.4.4.4 Update-source Loopback0Neighbor 4.4.4.4 Next-hop-selfNeighbor 13.1.1.3 Remote-as 3No auto-summaryR2 ConfigurationInterface Loopback0IP address 2.2.2.2 255.255.255.0Interface SERIAL0/1IP address 23.1.1.2 255.255.255.0Interface fastethernet1/0IP address 24.1.1.2 255.

Release date:Updated on: Affected Systems:Cisco NX-OSDescription:--------------------------------------------------------------------------------Bugtraq id: 64670CVE (CAN) ID: CVE-2013-6982 Cisco NX-OS is a data center-level operating system that represents a modular design, always-on and maintainability. The Border Gateway Protocol (BGP) feature of the Cisco NX-OS has a security vulnerability that allows unauthenticated remote attackers to reset a

Some experiences in man will be shared with you. The approximate topology is shown in (physical connection diagram). The two downlink devices (R1 and R2) and the two core devices both establish IBGP neighbor relationships with the two route reflectors RR, in the BGP of R1 and R2, use the network to publish the network segment 192.168.1.0/24 at the same time. 1. If no multiple paths (maximum-paths) are set on the two route reflectors, note: Cisco divid

Internet capacity has increased significantly over the past two years, and the explosive growth of Internet data streams has resulted in bottlenecks, especially in the "middle kilometer" Location Based on Internet networks. These bottlenecks are caused by different causes, which may degrade application performance or even cause service failure. Intelligent Route control ensures that companies control Internet routes while reducing network fees and effectively eliminating congestion in the middle

These days have been looking at BGP, I think the attribute of BGP is a difficult point, sometimes look at to their own are confused, especially the difference between LOCAL-PREF and MED in BGP. after finding some information on the Internet, I can understand a lot. Med is used to affect the inbound traffic. It is an announcement to the ebgp peer.The local-pref i

C through the BGP learning, will generate a routing table based on the shortest path algorithm to select the path of a more optimal service-side address assume a more excellent New route Table 10.0.0.1--192.168.1.3. In the process of use, the BGP network will continue to send each other keeplive packets if C to send a packet result of failure is a down, then C will delete the route table 10.0.0.1--192.168.