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Questions tagged [bgp]

BGP (Border Gateway Protocol) is a routing protocol that is primarily used to make routing decisions on today's internet. Questions must be about scripting BGP only. General BGP questions may be asked on https://serverfault.com or https://networkengineering.stackexchange.com

Border Gateway Protocol(BGP) is how the Internet routes traffic between routers. BGP advertises routes for a given IP and selects the best one for the traffic. The current version of the Border Gateway Protocol (BGP) which is BGP-4 is described in RFC4271 (https://tools.ietf.org/html/rfc4271).

Questions about the various BGP scripting languages are on-topic. Questions about BGP (routing, hardware, etc.) in general are not. Sites where you can ask broader BGP questions include

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get_bgp_summary_information RPC and using logical-systems

Hi I am trying to use PyEZ to to create an automation script. My goal is save response from bgp summary with logical system in a variable This one works: bgpinfo= cor1.rpc.get_bgp_summary_information but I want to get the bgp summary for logical…
farhad
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Does locally originated routes next hop always 0.0.0.0?

Does locally originated routes will always have next hop 0.0.0.0? and there is situation the a route that is no locally originated will have 0.0.0.0 as next hop? If yes, how can I differ between the two? thank you
Yoav Cohen
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BGP ASN design - advertise different prefixes from different locations in same AS

Is there potential for issues when advertising different prefixes from different locations but in same AS? Router 'A' in New York will advertise prefix x.x.x.x/24 and Router 'B' in London will advertise y.y.y.y/24. Both of the routers will exist…
N. Gene Eer
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Azure Virtual Network Gateway - Dynamic Public IP Address Changes

I am setting up a bgp ipsec tunnel with a service provider. The public ip addresses on the Azure side are set to dynamic, and I am wondering if these addresses would ever change? This is on the docs site regarding assignment of address: Dynamic:…
mike
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OpenDaylight BGP

Version: OpenDaylight Boron SR3 on Ubuntu 16.04 LTS I started playing with OpenDaylight BGP but I cannot bring up TCP session between ODL and router. ODL IP: 10.1.1.10 Router IP: 10.1.1.1 I have edited 41-bgp-example.xml as follows:
user3267989
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redistribute BGP routes in OSPF

Consider two routers A & B. Both of them run eBGP for connecting to ISP and also run OSPF inside the cloud. Both A&B also run iBGP and are connected in an internal iBGP mesh. How suppose prefix P1 is received at both A & B (eBGP). They run the bgp…
Neel
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Scapy BGP Flags Attribute

Is there any other way I could use Scapy to configure a packet with multiple flag attributes? I am trying to set up a BGP Layer with both optional and transitive attributes. I am using this github file:…
James Butler
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How fast is the BGP protocol?

Watched a CBT Nugget video and it was said that BGP protocol was slow. So if you brought up a domain it would take days for the domain to be fully accessible. However while at work a change was made on the router concerning BGP routes and it took…
user3561854
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BGP protocol, vantage points

Is there any place where can I obtain the routing table details of all the BGP vantage points located across the world? Like is there a method to collect and read the BGP dump? Or how can I get it from the RIPE Atlas? Or any other methods? Thanks a…
Sakshi
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Handle bgp protocol packet size

Why BGP protocol restict its packet size less than 4096 octet？ If the BGP packet size exceeds 4096 bytes,how should I handle this？
J.HAO
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BGP use of looking glass

What are the uses of a looking glass server to BGP protocol? What specifically does BGP look up on a looking glass server during path selection? Is is looking up the rest of the path-- beyond what it sees on on the path vector delivered to…
ashley
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What happens when one router sends whole Internet routing table to another? Is it redistribution of BGP to IGP

When one router sends Internet routing table to another, then all routes which are learned from IGP must be redistributed in BGP because maybe router which recieved table didn't start same IGP protocol, am I right? Thank you in advance :)
aurora93
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How to remove the authorization set by TCP_MD5SIG in setsockopt - C, Linux?

I have used TCP_MD5SIG to create password/key for the connection using the API - setsockopt() in C, Linux. This works fine for me. However, when I use it to remove the password/disable authorization with the same API except that the…
dexterous
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Understanding BGP routing

AS number 144 has two border routers BR1 and BR2. BR1 peers with AS 555. BR2 peers with AS 1977. Assuming that BR2 decides to advertise a route to the prefix 128.15.0.0/16, which of the following are valid route advertisements? AS 144 may have…
Dmitry Senkovich
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Cannot read compressed bz2 file from http://archive.routeviews.org/

For class we are to download these 54MB .bz2 files from routeviews. When I unzip the .bz2 files they are in .0000 format and around 500MB. When I -tail -f the output its a bunch of garbage. How can I convert these data to ascii so I can start…
Ducks
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