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BGP AS path Prepending outbound routes

by ShahedJuly 20, 2011October 22, 20150

BGP AS path Prepending outbound routes BGP AS path Prepending outbound routes is rich in features that you can have more control than on what IGP’s offer however, you can only have control on how the traffic leaves your autonomous system and can’t really control how other autonomous systems reach you. Other AS’es might have BGP policies that route the traffic in a way you don’t intend it to go. You don’t have control over those because, its their autonomous systems after all. However, there are work arounds which allow, an autonomous system affect the other autonomous systems, one of …

by ShahedJuly 15, 2011October 22, 20150

BGP Local-Preference Attribute Cisco Router BGP Local-Preference Attribute Cisco is another BGP attribute that’s important in the decision process for multiple redundant paths. In fact, if you’re concerned about the order of things, you should know that on Cisco routers, the “weight” attribute is checked first, so that if a given neighbor has a higher weight, the local preference isn’t even checked. However, it’s still quite important because it is an important attribute on all routers, and it affects the BGP routing process in much the same way. [boxads] Local Preference is one of the ways to alter the path …

by ShahedJuly 14, 2011October 22, 20150

Change BGP Weight Attribute Cisco Router by Route Maps Change BGP Weight Attribute Cisco router by Route Maps. Weight attribute is used by BGP to break the tie when there are more routes to the same network. Route with the highest weight is preferred. Weight attribute is a Cisco feature, it has local meaning and it is not transmitted to other routers. [boxads] In this example we will discuss about how to change BGP weight attribute cisco router by Route Maps. In the picture you see that WEST router in AS 65520 receives the routes advertised by EAST router in AS 65523 (172.16.0.0/24 and 192.168.100.0/24) over ISP-1 and ISP-2 routers. …

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 …