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

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Cisco Router Failover Configuration

I am a unix admin that has been stuck in the position of configuring a Cisco 1921 for one of our offices. In that particular site we have two connections, an AT&T eVPN and a Sprint MPLS. The MPLS ...
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14 views

Routing based on source ip + anycast bgp

Client A pings ip X > always server 1 Client B pings ip X > always server 2 Random client pings ip X > always nearest server (1 or 2) Anycast DNS Using BGP Tutorial explains the last ...
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10 views

Source ip based Anycast-BGP?

I'm just getting interested in networking so don't be too harsh on me :) Ideal: 2 servers with shared ip; ip X Client 1 pings ip X > always server A Client 2 pings ip X > always server B ...
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1answer
77 views

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 ...
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33 views

How do I automatically advertise a preferred route via BGP using keepalived?

I have a dual firewall setup with 2 active paths to the internet. These are independent and cannot be linked together on the WAN side. It's part of a deployment at a datacentre. Each firewall has ...
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1answer
65 views

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 ...
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91 views

Ping through a specific device or peer, BGP vyos

I am trying to figure out how I can compare latency to an end-point between two or more BGP peers. I am running VyOS 1.04 (community vyatta) and was using the linux ping command through command line ...
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2answers
431 views

BGP Multi-Homed Cisco Routers Configure For Resilience But Separate Inbound Weight

I've got 2 Cisco routers, each with a single Internet feed, providing BGP with default route only, which allows us to advertise certain routes out each feed. We're not using the full DFZ because ...
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1answer
96 views

BGP into OSPF and vice-versa - adding a 'weight' to a route?

This is probably more of a design question. I have two transit providers where I am receiving the full Internet routing table (via BGP) and am also participating in an IX where I am receiving routes ...
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79 views

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 ...
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2answers
57 views

Transparent proxy cache on BGP multihome

Provider A have transparent caching with squid . In the situation which a client has multihome BGP with provider A and provider B then client does not send its outgoing traffic (upload) to provider ...
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1answer
30 views

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 ...
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92 views

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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19 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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1answer
298 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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27 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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1answer
1k 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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74 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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114 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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1answer
553 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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2answers
181 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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1answer
629 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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47 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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295 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
87 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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161 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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1k 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
819 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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991 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
152 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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2answers
367 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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1answer
148 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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68 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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1answer
64 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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1answer
348 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
124 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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124 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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1answer
32 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
589 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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130 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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2answers
1k 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
3k 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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803 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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898 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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1answer
214 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
159 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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3k 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
201 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
205 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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2answers
124 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 ...