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Questions tagged [bgp]

BGP (Border Gateway Protocol) is one of the core routing protocols of the internet.

BGP (Border Gateway Protocol) is a protocol for exchanging routing information between gateway hosts (each with its own router) in a network of autonomous systems.

BGP is known as a path-vector protocol, the routing table contains a list of known routers, the addresses they can reach, and a cost metric associated with the path to each router so that the best available route is chosen.

Resources

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What are the advantages of OSPF vs nexthop self with iBGP?

Assuming I have a fairly small network internally, but I have 4 routers each connected out to a different network. The routers are all sat next to each other connected via a switch. Each router uses BGP to speak to the outside networks. There is an…
Matt Hamilton
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IP Level Failover for Web Servers With BGP (Am I Insane?)

I've considered using Round-robin DNS failover, but due to various levels of DNS caching, you run the risk of old records pointing to a down site. If I own my own address space and AS number, in data centre 1, I can announce my 1.1.1.x/x network to…
jwbensley
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BGP preferred outbound peer for given prefix when none of my peers directly announce the prefix (it's handled by the Default route)

I'm connected to 2 BGP peers; They both give me a filtered table that includes a default + about 30K prefixes each (not a full table). For prefixes that I do receive, I simply let BGP use it's prefix-length algorithm to select the best route. For…
Cosmin Prund
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Multihomed multi-router setup with Quagga BGP

I'm doing some labs with Quagga on Ubuntu 10.04 LTS as a BGP router in a multihomed and multi router setup. Currently I have setup a fake "ISP" router in my lab and have my two Quagga routers behind it sharing routes with iBGP and I have ran into…
Andreas Falck
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BGP/Multi Homing

We currently have an ASA5505 and are getting a 2nd ISP (both ISPs will have 20 up/down dedicated fiber). We need to be able to setup BGP/Multi-homing but I have found that the ASA's do not support this. This is due to the fact that they are more…
Lbaker101
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Cisco BGP clustering and route reflection configuration example

I am trying to make sure that I have this correct in my own mind how the Cisco configuration would be given the following example of route reflection and clustering with BGP. If you have three AS 1, 2 & 3 with one router in AS1 (Router A), four…
aHunter
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using bgp without owning ASN

Is it possible to use BGP to announce serving IP addresses without owning an AS number? Aim is to adding another WAN provider and increase redundancy with the ability to announce IP addreess from to healthy link. If not, what can you suggest me for…
seaquest
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What kind of internet connection and network setup do I need for hosting a web app

I am starting a web app company that will be hosting a social application on our own servers. We will be getting a fiber connection with a static IP address but I was wondering if there is anything specific I should look out for when hosting a site…
RayQuang
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Cisco BGP question about advertising routes

I have the following config and understand what's happening pretty well with everything except the routes I'm advertising. In other words it's INBOUND traffic I have a question about. What I 'want' to happen is for all traffic to be routed to me…
Domino
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How to connect two loopback interfaces on seperate cisco routers?

In order to get my iBGP session working I want to configure a static route from the loopback interface on router A (198.18.1.1/30) to the loopback interface on router B (198.18.1.2/30) and vice versa. How do I do this?
bleomycin
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What information do I need for initial setup of BGP?

I will be installing a MikroTik BGP capable router into a datacentre tomorrow, I have almost no idea how to do this but luckily there is an identical mikrotik router that has already been setup and is sitting next to it on a different connection…
SuperDuperAirVent
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IPv6 Forwarding working 1 way externally

Originally Asked on Network Engineering but told to ask on here instead. I'm having a problem with routing my own ipv6 prefix for anycast. I got my ASN and IPV6/48 sponsored with RIPE and I am struggling to get it to work properly. Any pointers of…
Entrepreneur AJ
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About MPLS label range

In most routers or switches that support MPLS, if transit label and uhp LSP label need to have a different label range? when protocol(LDP or BGP) assign labels, I know that VPN label and LSP tunnel label have different range, but I'm not very clear…
FLYFLY
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Why does bgp OPEN message get Connect Socket: Connection reset by peer when node is on a different subnet/gateway

My network setup: Kubernetes network setup With this setup, only nodes on same subnet can establish bgp connection. Other nodes (that do a full 3 way tcp handshake), responds to hte OPEN message with [FIN, ACK] then a [RST] hence the Connection…
tFlolo
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High usage IRQ/CPU on Centos 8 router BGP

PRC | sys 0.34s | user 0.10s | | #proc 124 | #trun 2 | #tslpi 93 | | #tslpu 0 | #zombie 0 | clones 0 | | #exit 0 | CPU | sys 1% | user 1% | irq 110% | idle …
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