understanding bgp

In the network structure, we have been paying attention to their deployment and optimization. As the network pressure increases, we have put forward higher requirements for some hardware and protocols. Now, we will focus on the deployment of BGP routing protocols. In general, the BGP routing protocol deployed in the domain should consider the following: 1. Actual network topology; 2. Whether the device pe

Local-preferenceLocal Priority PropertyOnly exchanged between IBGP peers and not advertised to other asThe greater the priority, the higher the priority, the default is 100For multiple exits of the same as, go out of the waybelongs to any recognized attributeNote: The source route delivery direction + specified peer+ the direction (Import/export) that you want to pass in order to correctly apply the routing policy.650) this.width=650; "Src=" Http://s1.51cto.com/wyfs02/M02/84/89/wKioL1eTYB3DW2H_A

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

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

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

-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

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.

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

BGP attribute experiment * network boundary summary Router (config-router) # no auto-summary -- default: BGP, r1_1 and r1_2, and OSPF are all automatically summarized on the network boundary -- BGP, r1_2, auto-summary can be disabled by and VPC-auto-summary is enabled by default before 12.2 (8)-after 12.2 (8, automatic summary is disabled by default * atomic Aggr

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 MPLS technology. Let's take a look at the following article. all problems can be solved. When LSR assigns tags B

Principles and configurations of the BGP protocol for HCNP learning notes 3-route AggregationThe BGP protocol can use commands to aggregate specific routes into an aggregation route. The Routing aggregation principle adopts the longest matching method with the same mask. Route aggregation can reduce the size of the route table. No Route details can be used to reduce the number of route changes. It does not

First, the experimental topology:Second, the experimental requirements:1, increase R5:as 5, and R2 through the Direct Connect route to establish BGP neighbor relationship;2, R2 deployed in BGP under Send-conmmunity to R5;3, R4 deployment ACL crawl 4.4.4.4 traffic, Route-map named Shuchu, call ACL, set community no-export, and invoke Route-map Shuchu out in the BGP