Mar 14, 2024
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Wizard lessons
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Google, Facebook, Apple, and Microsoft all affected by “intentional” BGP mishap.
How Border Gateway Protocol Enables High-Availability Telecom Infra
At its core, border gateway protocol manages how autonomous systems exchange routing information across network boundaries. Instead of focusing on speed alone, it prioritizes stability and policy control. This balance suits telecom networks that value predictability over raw routing aggression. By sharing reachability data, the protocol allows networks to identify multiple paths to the same destination. When a path degrades, traffic shifts without user impact. This adaptive behavior supports service continuity across continents, carriers, and cloud environments. High availability thrives when routing intelligence reacts calmly rather than aggressively.
What is BGP Routing? A Simple Guide to Internet
Discover what BGP routing is and how it powers the Internet. Learn about this crucial protocol that connects networks worldwide and enables global communication.
Table of contentsKey TakeawaysWhat is BGP RoutingInterdomain Routing ProtocolPath Vector RoutingEvolution of BGPBorder Gateway Protocol (BGP) EssentialsPolicy-Based Routing ProtocoleBGP and iBGPUnderstanding Internet ConnectivityAutonomous Systems and RoutesThe Role of Border Routers and PeeringAutonomous Systems in BGPBGP Routing and Network SecurityAuthentication and FilteringResource Public…
Mesh it Up Monday: BGP - The Glue That Holds the Internet Together
🌐💪🔗 Ever wondered how the internet stays connected across the globe? It’s all thanks to a magical protocol called BGP, or Border Gateway Protocol. BGP is like the glue that holds the internet together, ensuring that data flows smoothly between different networks and making the world feel like a smaller, more connected place. In this Mesh it Up Monday post, we’ll demystify BGP, explain how it…
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BGP (Border Gateway Protocol)
BGP (Border Gateway Protocol)
BGP (Border Gateway Protocol) is an open source, dynamic Exterior Gateway protocol designed to exchange routing and reachability information among various Autonomous Systems on the IP Networks and the Internet. It is a path-vector protocol type and uses the Composite metric (based on 11 factors usually) as its metric value. It is an EGP (Exterior Gateway Protocol) used for routing the internet.…
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BGP Attributes
BGP Attributes
Following are the attributes of the BGP:
Weight
Local Preference
Self Originated
AS Path
Origin
MED
Externals
IGP Cost
EBGP Peering
Router ID
Weight
Weight attribute is the BGP attribute which is used when one router is the multihomed and determines best path to leave autonomous system. Higher weight routes are the favored/preferred and only local router is influenced. Weight is the configurable parameter and Weight attribute can be configured as to change the weight of routes use the routes maps and other way to configured the weight attribute is to change the weight for all updates from the neighbor use the neighbor weight router configuration command. BGP route selection process prefers the highest weight. The default value of the weight attribute is 32768 and the range of the weight value is 0 to 65535.
Local Preference
Local preference is the second attribute of the border gateway protocol and this attribute is used only within the autonomous system to determine the best and valid path to leave the Autonomous system. So, the highest value of the local preference is preferable and the default value of the local preference is 100. This attribute is the attribute that is exchange between the IBGP neighbors. The local preference range is 0 to 4.29 billion and It can be configured with the help of the route map and the other way to change the default local preference for all the routes advertised by the router use command that below.
Self Originated
Self originated is the attribute that prefer locally originated paths.
AS Path
AS path is the other attribute that is most usable attribute of the border gateway protocol and this attribute preferred if it has the shortest AS path regardless of the available bandwidth. This attribute is the attribute that is used for the loop avoidance purpose.
Origin
Origin is the other attribute of the border gateway protocol and this attribute is preferring the IGP learned routes over EBGP and the EBGP over unknown.
MED
MED is used to for the deciding how to enter an autonomous system when multiple paths exist and when comparing the MED values for the same destination network in border gateway protocol path selection process in that case the lowest MED value is preferable. The default value of the MED attribute is 0. This attribute is evaluated late in the border gateway path selection process.
Externals
Prefer the EBGP routes over the IBGP.
IGP Cost
This attribute considered IGP metric that should be lowest.
EBGP Peering
This attribute favors the more stable routes and oldest routes are most preferable.
Router ID
This is the last attribute of the border gateway protocol which is known as the tie breaker and the lowest router ID is the preferable.
Border Gateway Protocol is very important for Network study. We think the BGP study is very interesting according to other network topics because it is having too wide or deep network detail in itself. Main is that if you have not knowledge about the other network protocols or else but you can easily understand BGP.