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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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HP 5820 Switch in BGP routing

I planning to build an isp network with 2 redundant BGP routers. After a bit of research I found strange that even switches can do BGP, at least that's what it says in their manual. Considering how cheap they are compared to a modular HP switch or…
oraculum
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BIRD iBGP - Route not reachable

i have two machines participating in the DN42 network, a darknet driven by the Chaos Computer Club and others to play around with advanced routing techniques like BGP and stuff. The machines are connected via an OpenVPN connection and can ping each…
simonszu
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Redundant Debian Gateway

I have to configure a redundant gateway with Debian boxes and I would like to get some recommendation what's the best solution in my case. There are certain limitations in my setup and I have to go for sure (100% working). I read this…
icighia
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Use of loopback Interface in iBGP

As I understand that the loopback interface(127.0.0.1) is used to route packets back to the source. How is it then used to talk to iBGP neighbors? I understand that the goal is to ensure that the interface doesn't go down, so using an…
Jack
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Why an anycast server is so far away / slow? How does BGP anycast work?

I've tried doing a couple of traceroute tests to the DNS servers of Rage4, which are anycasted from many parts of the world (supposedly, from 30 different locations). What I've experienced is that very often the traceroute shows that the server…
cnst
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Influencing outbound routes on multi homed BGP setup

I have a multi-homed network setup. I'm using a Cisco 7200 to do BGP advertising to both provider A and B. For each provider, I have a separate /24 that I'm using. I am AS prepending to influence the block A to provider A, and block B to provider…
ctennis
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If route-refresh is negotiated BGP hard reset never happens?

When route-refresh capability is negotiated between two BGP peers , "clear ip bgp *" will not trigger a hard-reset at all. Is it right to say that hard reset never happens with router with route-refresh capabilities ?
Hemanth
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BGP behaviour if both soft-reconf and routerefresh available

Which behavior will take effect if both "soft-reconfiguration" is configured and route-refresh capability is negotiated ?
Hemanth
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Advertise iBGP learned routes to sub-AS confederation peer

I am having a difficult time figuring out one of the fundamental rules of iBGP, eBGP, and confederations. Consider the following routers which are all in the same Autonomous System (AS) r1 == r2 == r3 r1 is in sub-AS(confederation) 65100 r2 and…
jl3128
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openbgpd: announcing our prefix

i use quagga as active for bgp4 but i am searching openbgpd. I installed openbgpd on freebsd. i am new at openbgpd. I have an AS and also my customer's AS. I have 2 IPSs for internet. how can i restrict sending all our prefixes towards my isps by…
Bulend Mali
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linux routing or natting with ip on loopback interface as alias

Ive got eth0:0 192.168.2.10 (for bgp network announce, no vlan, alias on eth0) eth0.1 192.168.3.20 (for bgp session 1,vlan3 transport to bgp router) eth0.2 192.168.4.30 (for bgp session 2,vlan4 transport to bgp router) default route is given by…
MealstroM
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Looking Glass script

Can you recommend good and secure looking glass scripts with traceroute,ping and bgp? I want to install it to my website, and connect to Cisco routers.
TiFFolk
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BGP Multipath & return routes

I'm probably a complete n00b concerning serverfault related questions, but our IT department makes a bold statement I wish to verify. I've searched the internet, but can find nothing related to my question, so I come here. We have Threat Management…
Dennis van der Stelt
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High latency due to non-presence of a transit provider in my country

My ISP, a state owned incumbent, buys bandwidth from different transit providers. Whenever it buys transits it announces only a specific prefix (in most cases a hitherto unused) through the new transit AS. For e.g. if it runs out of bandwidth, it…
nixnotwin
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Are ASNs tied to one location/router/physical point?

I am trying to understand how BGP works, and is looking at ways to identify if my ISP is having bottlenecks/slowdowns/dos attacks at thier upstream ISPS. I have a bunch of ASN numbers that I can check, but I was wonder if these ASN numbers are tied…
Craig
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