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Posts tagged with "BGP"
BGP – the protocol that runs the Internet
BGP peer groups, dynamic update peer groups and BGP templates
May 7, 2020
As a router gains more and more BGP neighbors, two issues arise. The first one is that with many neighbors, whenever the router needs to...
BGP errors, BGP error codes, and BGP error handling.
Apr 3, 2020
In this blog post we’ll be looking at BGP errors. For that, our first question should be: is there an error, or is everything...
BGP – the right tool for so many jobs
Mar 20, 2020
Like other very successful protocols such as HTTP and DNS, over the years BGP has been given more and more additional jobs to do....
BGP security: an overview of the RPKI framework
Mar 19, 2020
The Resource Public Key Infrastructure (RPKI) system is a way to couple an IP address range to an autonomous system number through cryptographic signatures,...
The 768k or Another Internet Doomsday? Here’s how to deal with the TCAM overflow at the 768k boundary.
May 2, 2019
On August 8th, 2014 some ISPs experienced a phenomenon called the “512k Day”. The global BGP routing table, which consists of the global Internet...
BGP Labeled Unicast (BGP-LU)
Oct 17, 2018
This blog post discusses BGP Labeled Unicast (BGP-LU) which is used in multi-regional networks to carry the label information. While the RFC3107 “Carrying Label...
Recursive Lookup in BGP
Oct 12, 2018
The aim of this article is to discuss the importance of Recursive Lookup in BGP. First of all we need to understand the purpose...
Accumulated IGP and BGP
Oct 4, 2018
RFC 7311 defines an optional non-transitive BGP attribute called the Accumulated IGP Metric Attribute (AIGP). As we know, IGP stands for Interior Gateway Protocol...
QoS Policy and its propagation via BGP (QPPB)
Sep 24, 2018
Quality of Service (QoS) refers to a collection of technologies that networking devices use to apply different treatment to packets as they pass through...
BGP Conditional Route Injection
Aug 7, 2018
We have recently posted the BGP Route Aggregation eBook that discusses the benefits of route aggregation and explains the various optional parameters associated with...
BGP Route Dampening: obsolete or still used in the industry?
Aug 1, 2018
The unstable route whose availability alters repeatedly is called a flap. When flaps occur, fexcessive number of BGP UPDATE messages are sent to BGP...
BGP Attribute Filtering and Error Handling
Jul 26, 2018
The BGP Attribute Filter feature enables BGP speakers to take a certain action based on the presence of a specified path attribute inside the...
BGP Optimal Route Reflection as an alternative to BGP Add Path
Jul 10, 2018
Full iBGP Mesh and Route Reflection To avoid loops in a Full iBGP Mesh, BGP routers are only allowed to learn prefixes over iBGP from...
Network Address Translation (NAT) and BGP Explained
Jul 5, 2018
Network Address Translation (NAT) was originally described in RFC 1631. Although initially presented as a short term solution for preventing the IPv4 addresses depletion,...
Advertising Multiple Paths in BGP (BGP-Addpath)
May 28, 2018
The BGP advertisement of a prefix with new attributes replaces the previous announcement of that prefix. This behavior is known as an Implicit Withdraw,...
BGP and Traffic Engineering Mechanisms for WISPs
May 10, 2018
In this blog post, we will take a look at Kevin Myers's presentation where he discusses deployment of both OSPF and BGP routing protocols...
Bit Indexed Explicit Replication and the BGP Extensions for BIER
Apr 11, 2018
In this article we’ll take a look at the architecture for multicast forwarding called the Bit Indexed Explicit Replication or simply BIER. However, we’ll...
BGP/MPLS Layer 3 VPNs Practical Configuration
Mar 21, 2018
In our previous blog article we’ve discussed the benefits and the fundamental principles of BGP/MPLS L3 VPNs. We have covered the definition of the...
BGP / MPLS Layer 3 VPNs
Mar 13, 2018
What is VPN? Virtual Private Networks (VPN) are designed to provide users with the private networks capabilities over a shared infrastructure. They connect remote sites...
Internet of Things and BGP
Nov 17, 2017
The Internet of Things (IoT) attracts huge public attention nowadays. It is a network of interconnected physical devices (things) which sense and interact with...
BGP and Cryptocurrencies
Oct 19, 2017
What is Cryptocurrency? Cryptocurrency is a digital asset that works as a medium of exchange. It uses cryptography to secure transactions and to control the...
BGP in Large-Scale Data Centers
Sep 19, 2017
Large-scale data centers (DCs) connect hundreds of thousands or even more servers, having millions of users. Generally, every DC runs two kinds of applications....
What BGP Looking Glass servers are and how network administrators use them.
Mar 16, 2017
Whether you are an experienced network administrator or you have just started to learn Border Gateway Protocol (BGP), Looking Glass (LG) is definitely a...
Noction bets on BGP FlowSpec
Sep 26, 2016
While networks are agnostic to the content of the serviced packets, end users have a very good understanding of what traffic they have and...
BGP and asymmetric routing
Jun 22, 2016
What is Asymmetric Routing? Asymmetric routing is the situation where packets from A to B follow a different path than packets from B to A....
Migrating to BGP
May 30, 2016
Here on the Noction blog we've covered many aspects of using BGP to connect your network to the internet. However, often implementing BGP isn't...
BGP and equal-cost multipath (ECMP)
Mar 25, 2016
One given in the network world is that bandwidth will increase. So that Gigabit Ethernet link that provided bandwidth to spare a year ago...
Lesser-known BGP path attributes
Nov 5, 2015
The past few weeks we've discussed the main BGP path attributes: the next hop, the AS path, the MED. We also covered the community...
Optimizing network performance for online gaming
Aug 25, 2015
In many online games, very good network performance is a prerequisite for satisfactory gameplay. However, there are many kinds of games, and their networking...
BGP security: announcing prefixes without authorization
Apr 14, 2015
In our last post, we looked at protecting the TCP session that carries BGP information between two routers, mainly against spoofed TCP resets. However,...
BGP Security: the MD5 password and GTSM
Apr 1, 2015
Back in the late 1980s and the early 1990s when BGP was developed, security was still an afterthought for protocols used on the internet....
Do route optimizers cause fake routes?
Mar 27, 2015
Yesterday, an incident occurred where an Autonomous System (AS) advertised more than 7,000 prefixes that belong to other networks. These are "more specific" prefixes—subsets...
What should your peering policy look like?
Feb 27, 2015
As discussed in earlier posts, as networks grow larger it starts making sense to exchange traffic with other networks directly (peering) rather than pay...
IPv4 BGP vs IPv6 BGP
Feb 6, 2015
BGP is older than IPv6. Even BGP-4, the version we still use today, predates IPv6: the first BGP-4 RFC (RFC 1654) was published in...
The top 4 causes of network downtime
Jan 12, 2015
Business people often believe that in order to have a reliable system, you need reliable components. Using reliable components to build your network certainly...
BGP and OSPF. How do they interact.
Dec 15, 2014
In some ways, BGP is nice and simple. For instance, there's only one BGP: BGP version 4. Many network professionals have been asking the...
Understanding BGP Communities
Nov 21, 2014
After reading the title of this article you may be thinking of small neighborhoods in the world's most-connected cities where BGP-minded people live together,...
Filtering your BGP updates
Oct 30, 2014
One thing we all learn quickly after getting started with BGP is that if left to its own devices, the protocol will happily propagate...
Why BGP is not enough?
Sep 11, 2014
It’s common knowledge that Border Gateway Protocol has no ability to make performance-based routing decisions and often routes traffic through paths that are congested...
Route Reflectors – an alternative to full-mesh iBGP configuration
Oct 25, 2013
The typical fully-meshed iBGP configuration of routers can become very difficult to manage in large networks. Because of the increasing numbers of iBGP sessions...
Routing anomalies – their origins and how do they affect end users
Sep 20, 2013
Nowadays, the Internet is made-up of more than 45,000 active Autonomous Systems (ASes), each with a different complexity level and specific configurations. To accomplish...
BGP-based inter-domain traffic engineering: important considerations
Aug 7, 2013
Inter-domain traffic engineering aims to optimize traffic performance, originating and terminating in different administrative domains. At the moment, Autonomous Systems exchange traffic via exterior...
Deploying BGP for redundant IP connectivity
Mar 13, 2013
All organizations that depend on Internet for sales revenue or business continuity require internet redundancy. Downtime lowers productivity, yields losses and painfully affects the...
Is BGP multi-homing enough for WAN network performance?
Mar 16, 2012
BGP multihoming has become as necessary to the networks connected to Internet, as the use of redundant power sources or multiple data centers. No...
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