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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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How can I implement BGP on ryu?

I need to connect two Autonomous Systems by using the BGP running on Ryu controller. I've been trying to implement different codes I found, but I don't know how to do it properly. Please provide any method to do this.
NATHALIA ANDREA GIRON GAVILANE
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How do you find loops in a BGP routing

I'm trying to program a simplified version of a eBGP speaker. For the import policy, I want to make sure that any new route that I import doesn't have any loops. The routing table that I build looks something like this. 10.0.0.0/8 3 8 11 10.8.0.0/8…
adityagnet
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Configuring BGP using Azure portal

Does Azure web portal support configuration of BGP on VPN gateways? All online documentation seems to contain steps using powershell. But powershell doesn't work with linux machine. Am I correct? So, does only way to conifgure BGP on VPN gateways…
user2085218
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Replay BGP Updates to Quagga

I have a small setup where there are 3 connected ASes running Quagga, and I want to test this setup by replaying historical BGP data. How can I do this? I'd appreciate any thoughts and guidance.
Azzam
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In what possible situations an ip 0.0.0.0 mapped to several domains would show up in passive DNS data?

I am studying a sample of A records of passive DNS data (mapping between ips and domains) and I see that a lot of domains are mapped to 0.0.0.0 as an IP.…
UserYmY
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Computer Networking - BGP

Consider the network shown above. Suppose all ASs are running OSPF for their intra-AS routing protocol, with the cost of each link equal to 1. Suppose eBGP and iBGP are used for the inter-AS routing protocol. Initially suppose there is no physical…
Layla
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BGP control plane information in MPLS VPN

I am learning about MPLS VPN networks. From my understanding an IGP runs on all core routers (P and PE), while BGP runs on all PE routers. Once the IGP has conveyed reachability information to all routers, and all routers have converged, the exact…
Hashken
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How to specify invalid Path Attributes in BGP Packets [Scapy]

I am using Scapy to capture packets and modify one of the BGP packets and replay it to the routers. We are testing a vulnerability in our routers. For this, I need to set the Path Attributes to an invalid value and malform the packet to see how the…
JOKER
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Trouble Configuring BGP on Cisco IOS-XE using Terraform

so I am struggling to do a PUT so I can configure a bgp asn on my Cisco catalyst 8000v deployed on AWS provider "iosxe" { username = "ec2-user" password = "password" url = "https://${aws_instance.Workload.public_ip}" } resource…
charles uneze
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Issue with Juniper vMX14 route reflector not transmitting VRF

I am working on a project implementing Seamless MPLS on a Juniper vMX14 router. I have configured all the necessary configurations for MPLS routing, but I am having an issue with the route reflector. The route reflector doesn't seem to be working…
Manseur Dounia
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Configuring BGP between 3 routers in GNS3 throws an error

For a school assignment we have use GNS3 to set up 3 routers in a circle to communicate with BGP and hook up a PC to each of them. We then have to try pinging one PC from the other and suspending a connection between two routers and see how it takes…
blazspaca
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How would we manually find the ASN of a network?

When it comes to ASN and lookups I always wondered how these sites obtain these lists. I see it's not always real-time as numbers change and assume it's scanned. Is there any links, write-ups or information on this?
BGPHiJACK
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Can routing entries in EVPN VxLAN be shared between different VRFs?

When I built the EVPN VxLAN simulation environment in GNS3, I found that the learned overlay routing entries and underlay routing entries are as follows for SW-1: Test TOPO SW-1# show ip route Codes: K - kernel route, C - connected, S - static, B…
Yongxin Cao
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No Display BGP information Napalm

I'm studying about Python scripting and testing a couple of scripts with Napalm. In my scenario, I'm access the Sandbox Router from Cisco and create the config based on file "NapalmBGP-R1.cfg. Works fine, but I try to after the user run this…
Pedro Ferreira
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AWS direct connection - multiple subnets from datacenter

I'm having trouble trying to figure out how to get the datacenter subnets to talk to aws via direct connect using BGP. Below is the setup. Datacenter Router - Cisco ASR 1001-hx Datacenter subnets VLAN 10 - 10.100.0.0/24 VLAN 20 - 10.200.0.0/24 AWS…
Bhargav
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