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

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Benefits of peering with Transit Providers at exchange points

Whilst investigating choices of IXPs and browsing through member lists, I realised that Hurricane Electric publicly peered on AMS-IX and other popular IXs. I also came across their peering policy that ...
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17 views

Is it possible to run IPv6 only BGP sessions?

We wish to peer with some members of an IXP that all support IPv6 peering. We do not wish to publicly peer on the IXP. Is it possible to save ourselves the trouble of getting a /24 block of v4's and ...
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25 views

Will iBGP fix this routing scenario?

I have to firewalls running for a cloud service in a data centre providing HA internet for currently around 40 machines. Each machine is a Linux based router and has it's own 10Gbit feed from ...
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142 views

Where do local ISPs' core networks connect to? [closed]

Where do local ISPs' core networks connect to? Do they connect to the Internet Backbone owned by AT&T and Sprint (among others) or do they connect to an IXP (Internet eXchange Point)?
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19 views

Restarted BGP routers have no routing updates?

I configured 3 cisco c3725 Routers in GNS3 and I setup BGP and it was working fine at first. All 3 routers are connected to each other and each router has some loopback interfaces wich are the ...
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172 views

Simple Vyatta configuration / BGP routes not injecting into routing table

I have a exceptionally simple setup I'm playing with however I'm banging my head against the wall as to why it's not working. Right now I have two Vyatta routers (R1, R2) connected locally. Both are ...
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37 views

bgp and incomming requests

I have IP pool, 2 providers and BGP on RouterBoard. First provider is default. Second is backup. If first provider falls - outgoing connections works on second. But incoming still routed to broken ...
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66 views

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 ...
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160 views

Internet Routing with BIRD

I am testing BIRD to put into production to replace several VPN appliances I am using to route to my AWS site. I've never used BIRD before so please forgive ignorance/ If I put a test windows ...
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60 views

split ospf domain in two ospf domains interconnected with bgp (BIRD)

I have created a line topology consisting of 4 ospf routers (VMs running debian with the BIRD routing daemon): R1 (10.0.1.1) <-> (10.0.1.2) R2 (10.0.2.1) <-> (10.0.2.2) R3 (10.0.3.1) <-> ...
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122 views

Understanding traceroute-result / the connections between ISP-networks

I was playing with traceroute and discovered that I have a gap in my knowledge on how the Internet works. So, in order to get a better feeling for what happens when I connect to a host, I think I ...
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296 views

Linux “traceroute -A” (AS path lookup) equivalent for Win XP?

Can anyone recommend a Win XP command-line traceroute implementation providing a function equivalent to the Linux "traceroute -A" option, which includes in its output the BGP AS number (Autonomous ...
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40 views

Is it possible to use a LAN in a VRF to administrate MPLS backbone?

In this topology, the customer connections and Internet access are working for everyone. The problem is that I need the LAN in VRF3(SITIO3) to have access to the ISP MPLS backbone (4 PE routers, 2 P ...
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38 views

Cisco - redistribute prefix [closed]

I had 2 C class IP's: xx.xx.xx.0/23. I must advertise it on BGP protocol. My config is: ip route xx.xx.xx.0 255.255.254.0 Null0 ! access-list 50 permit xx.xx.xx.0 0.0.1.255 ! route-map ...
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138 views

JunOS Regular Expressions for AS Path

I want to write a regex in Juniper MX960 router for BGP including 3 AS paths with first element is constant, second and third are wildcard. I found that we can put as numbers manually like this: ...
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1answer
66 views

Cisco 7200 VXR - BGP Cache Corruption?

We are running an old Cisco 7200 VXR router as our border router and lately have had issues with sites failing to resolve. A manual BGP reset on this router resolves all of our problems. I'm fearing ...
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128 views

quagga 0.9.22 does not throw the routes to OS routing table on FreeBSD 9.0 RELEASE

I have FreeBSD 9.0-RELEASE-p6 amd64 on board with quagga 0.9.22 (previously it was 0.9.21). I have 2 peers as my ISP. One provides the traffic to country-based endpoints, the other - to the rest of ...
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87 views

BGP can I specify using the backup link for some network

assuming I connect to two diff ISP and set them up as redundant connections, one with heavier weight than the other. Is it possible for me to say, any route to some guy in Spain should use the slower ...
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619 views

Juniper EX BGP with Default Routes

I'm new to BGP - so this is certainly a learning exercise. I'm moving away from PA space provided on 2 routed uplinks to having my own IP space and multi-homing my transit. To begin with, there will ...
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1answer
439 views

Dual Cisco Router Stateful Firewall

At my company we have a single Cisco 3925sec/k9 router running BGP with 2 ISPs. Now we want to purchase a redundant router of the same model to eliminate a single point of failure. I can set up BGP ...
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3answers
646 views

Practical Anycast

I've read How can I send visitors to the closest server using DNS? post, but there's still some thing, on a practical level that I don't understand. Say I have two servers. One in NY another in ...
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1answer
100 views

How can I multipath BGP prefixes of equal AS-path length?

Say I have two routes of 10.0.0.0/8. One has an AS-path of 100 200 300, the other has 400 500 300. How can I make BGP install both routes into the FIB on a Cisco router?
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230 views

BGP/ASN: Network without own backbone?

I'm trying to understand the principles of routing in the internet, especially regarding (E)BGP. So far, I understand the situation of a "typical" ISP (e.g. with the ASN 2) that has its own backbone, ...
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111 views

Redistribution of iBGP learned routes to all routers?

I am trying to accommodate for a link failure between LB1 (a Linux machine running Quagga) and either PAT1 or PAT2 (Juniper MX80 routers). The following diagram is a canonical version of my network ...
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56 views

BGP Dual-As support, any RFC?

Generally most of routers like cisco and junos allow a router to have dual-As to be configured via a "local-as" command which overrides the global as-number configured in "router bgp ". Also local-as ...
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51 views

BGPmon login: 'Password: incorrect access password'

I have installed BGPmon following the manual. When I try to login by typing the address "http://127.0.0.1:50000/" on address bar, It shows "Password: incorrect access password" message. thank you
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251 views

Nagios check_bgp_neighbors plugin showing critical status

I am trying to configure nagios check_bgp_neighbors plug-in on Ubuntu and followed README file of check_bgp_neighbors plug-in. I have made following changes: define command{ command_name ...
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2answers
83 views

How long BGP reconnect happens?

when the bgp peer is down or during initial startup if the bgp speaker is not able to reach the peer, how long will the reconnect tries happen? will the bgp speaker try reconnecting infinitely ?
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90 views

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 ...
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29 views

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 ?
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1answer
368 views

BGP path prepended route not listed anywhere

We have a simple multi-homed setup with two routers that advertise our AS to two ISP. The second ISP (ISP B) is only used for backup when ISP A goes down, so we prepended our AS 3 times on this route. ...
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109 views

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 ...
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889 views

Can DDoS be stopped with BGP? [duplicate]

When I am experiencing DDoS @10Gbps, if I have BGP router with 10M table entries in it, can I perform search on the offensive network? I would do this the way, that first I would remove routing to me ...
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1answer
2k views

Quagga vs XORP vs BIRD - linux BGP router recommendation

For a small multihomed network (/21) I am researching possible bgp router software for linux. I found Quagga, XORP and BIRD and was wondering if I have missed other recommendable bgp software ...
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578 views

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 ...
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652 views

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 ...
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184 views

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 ...
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1answer
118 views

32-bit AS number. Where can it be tricky?

Can 32-bit ASN be dangerous/tricky in any way? We are currently implanting BGP in our network. One of the uplinks has emphasized that their ASN is 32-bit. Ours is 32-bits as well. What is it I should ...
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3answers
2k views

How to prevent asymmetric routing with multiple eBGP routers?

I have 2 routers announcing a /22 subnet to different providers (one providers connects to each of the 2 routers). I have split the /22 in two /23 to announce one /23 on each of the routers plus the ...
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1answer
187 views

Which routers support bgp and would work well for simple dual office redundancy [closed]

We have two sites that each have an internet connection and have a dedicated dark fibre between them. Each site has it's own IP space and we have an AS number. We're looking to be resilient to failure ...
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1answer
195 views

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 ...
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119 views

Border Gateway Protocol [closed]

I'm moving our company out of managed hosting into our own colocation. I have a variety of high quality options for bandwidth and my network consultant suggests we run BGP with multiple providers in ...
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1answer
137 views

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 ...
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3answers
514 views

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 ...
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268 views

Will anycast helps me in my case and how to implement it?

I have several servers with different IPs, deployed in different datacenters (mostly geographically close to our users). Let's imagine that this is simple web servers. What I'd like to have is a ...
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210 views

Is it just me or is my node down?

I find the www.doj.me very useful. I am looking for something like that but specifically for BGP Nodes. I want to write a script that tells the users if our Internet backbone is down, if if yes which ...
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1answer
226 views

How to prevent default route from propagating into iBGP?

I have 2 Foundry FESX448 switches which have external BGP connections. Each of them receive a default route. These 2 switches also have a BGP session configured between themselves and advertise routes ...
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3answers
406 views

2 BGP Upstreams, One sending default route, another Full Table

We have 2 upstreams ISP A and ISP B. ISP A (10Mb/s) is our main upstream with good bandwidth. It sends us default route over bgp. ISP B (2Mb/s) is our backup upstream with a small bandwidth, but it ...
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166 views

BGP network command route announcement

I have defined 3 AS (1000 <---> 2000 <---> 3000). Every AS has one router with 2 fa interfaces and one loopback. After starting bgp on all interfaces and announcing networks with commands: ...
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214 views

Choosing Transit Providers

My organisation is in a position where we are paying quite excessive charges for single homed IP transit form our primary data centre provider. We're at the position now where we're ready to start ...