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BGP Weight Attribute Configure

by ShahedJuly 10, 2011October 22, 20150

BGP Weight Attribute Configure BGP Weight Attribute is a Cisco Proprietary attribute that influences a router how to reach a certain prefix. The difference between Local Preference and Weight is that the former is propagated within an AS and the latter is router locally significant. Weight can be used if there is one router connected to two or more AS’s or just to just one with two or more eBGP peers. Now, lets configure weight and later use a route-map for more complex use of weight. [boxads] Weight is a Cisco Proprietary attribute for BGP that is “locally significant.” Local …

by ShahedMay 17, 2011October 29, 20151

DMVPN Configuration Example: In the DMVPN Overview article We explained how DMVPN combines a number of technologies that give it its flexibility, low administrative overhead and ease of configuration. This article will cover the DMVPN Configuration including Hub, Spokes, Routing and Protecting the mGRE Tunnel.[boxads] DMVPN Configuration is simple, if you’ve worked with GRE tunnels before. If the GRE Tunnel concept is new to you, we would recommend reading through our Point-to-Point GRE IPSec Tunnel Configuration article before proceeding with DMVPN configuration. DMVPN as a design concept is essentially the configuration combination of protected GRE Tunnel and Next Hop Routing …

by ShahedMay 13, 2011October 29, 20150

DMVPN Overview: Dynamic Multipoint VPN (DMVPN) is the increasing demands of enterprise companies to be able to connect branch offices with head offices and between each other while keeping low costs, minimizing configuration complexity and increasing flexibility.[bodyads] With DMVPN, one central router, usually placed at the head office, undertakes the role of the Hub while all other branch routers are Spokes that connect to the Hub router so the branch offices can access the company’s resources. DMVPN consists of two mainly deployment designs: DMVPN Hub & Spoke, used to perform headquarters-to-branch interconnections DMVPN Spoke-to-Spoke, used to perform branch-to-branch interconnections In …

by ShahedMay 12, 2011October 24, 20151

Dynamic Multipoint VPN DMVPN Architecture: There is a number of different ways an engineer can implement a DMVPN network. The fact that there is a variety of DMVPN Architecture models, each one with its caveats and requirements, means that almost any VPN requirement can be met as long as we have the correct hardware, software license and knowledge to implement it. [boxads] Speaking of implementation, no matter how complex the DMVPN network might get, it’s pretty straight forward once it’s broken down into sections. Engineers already working with complex DMVPNs can appreciate this and see the simplicity in configuration they …

by ShahedMay 8, 2011October 24, 20150

DMVPN Configuration: DMVPN stands for Dynamic Multipoint VPN and it is an effective solution for dynamic secure overlay networks. In short, DMVPN Configuration is combination of the following technologies: [boxads] 1) Multipoint GRE (mGRE) 2) Next-Hop Resolution Protocol (NHRP) 4) Dynamic Routing Protocol (EIGRP, RIP, OSPF, BGP) 3) Dynamic IPsec encryption 5) Cisco Express Forwarding (CEF) Assuming that reader has a general understanding of what DMVPN is and a solid understanding of IPsec/CEF, we are going to describe the role and function of each component in details. In this post we are going to illustrate two major phases of DMVPN …

by ShahedApril 11, 2011October 22, 20150

BGP Attributes Categories BGP Attributes Categories are 1) WELL-KNOWN, MANDATORY , 2) WELL-KNOWN, DISCRETIONARY, 3) OPTIONAL, TRANSITIVE, 4) OPTIONAL, NON-TRANSITIVE. details are: [boxads] WELL-KNOWN, MANDATORY AS-path: A list of the Autonomous Systems (AS) numbers that a route passes through to reach the destination. As the update passes through an AS the AS number is inserted at the beginning of the list. The AS-path attribute has a reverse-order list of AS passed through to get to the destination. Next-hop: The next-hop address that is used to reach the destination. Origin: Indicates how BGP learned a particular route. There are three possible …