Server Fault Stack Exchange
Server Fault Stack Exchange

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

176 questions
4
votes
2 answers

When using traceroute -A, where does the ASN come from?

I haven't cracked open the source code yet, but I was curious which whois service the traceroute program uses to look up ASNs for a given IP.
Noah Campbell
  • 619
  • 2
  • 9
  • 15
4
votes
3 answers

Is Internet routing (BGP) fully automated?

If all the routing tables on the Internet would be erased simultaneously, will the routers be able to rediscover them automatically? I'm having an argument with a colleague who says that the RIPE routing tables are essential, but I remember reading…
Meh
  • 373
  • 2
  • 7
  • 10
4
votes
1 answer

Quagga keeps announcing down routes

I have set up BGP on two routers using qugga. When I down the interface that holds the IP block that I am advertising zerba removes the route from its table but bgpd keeps advertising it. I can see that it is still advertised via the neighboring…
Kyle Brandt
  • 83,619
  • 74
  • 305
  • 448
4
votes
5 answers

ASA 5505, is BGP supported?

I need to configure BGP on an ASA 5505, according to certain sources it isn't supported, yet I can find resources on the internet giving information on how to configure BGP. I'd really like an expert to answer some queries for me. Can you…
sorrrydoctorforlove
3
votes
0 answers

ping between ipv6 and ipv4 networks

I have 2 networks (one ipv4 and one ipv6) , I used ospf as routing protocol for both networks. I activate bgp between this 2 networks(R6 and R1) and now R6 can ping the full ipv6 network and R1 can ping the full ipv4 network. Now I want r7 to ping…
sara
  • 31
  • 3
3
votes
1 answer

How do I enforce preferential routes with BGP & Quagga?

I have two routers that I'm setting up currently and they will be feeding my network of servers with a private AS number provided by the datacentre. What I want to do is provide both a VRRP failover default route for servers on the network, and also…
hookenz
  • 14,472
  • 23
  • 88
  • 143
3
votes
0 answers

Solving an asymetric HA Firewall/router

I have an old Linux HA firewall/router setup that never quite worked. As it was never quite put into true production (just testing and demo's), I always had to have one firewall shutdown to make it route. Now we're planning on putting this into…
hookenz
  • 14,472
  • 23
  • 88
  • 143
3
votes
2 answers

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 only be a single transit provider - and they have…
choco-loo
  • 509
  • 1
  • 4
  • 14
3
votes
1 answer

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 between routers and ISPs no problems. We plan to…
Alec T
  • 463
  • 1
  • 9
  • 21
3
votes
1 answer

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 be paying attention to when dealing with 32-bit…
facha
  • 1,368
  • 2
  • 18
  • 26
3
votes
2 answers

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 backbone routes we are using. If I know the AS…
Craig
  • 43
  • 2
3
votes
3 answers

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 sends us Full Routing Table. I am new to BGP so…
Alec T
  • 463
  • 1
  • 9
  • 21
3
votes
2 answers

How any routing protocol packet reaches(flows of operations) from NIC card (physical layer) to any Routing (OSPF/RIP/BGP) daemon?

The problem is rearding the routing protocol packet flow in any linux/unix device where multiple routing protocol daemons are running. How any routing protocol packet reaches(flows of operations) from NIC card (physical layer) to any Routing…
mav_2k
  • 141
  • 1
  • 3
  • 8
3
votes
2 answers

What happens if one BGP peer only gives me a default while the second peer gives me the full table

Summry question: If ISP A only gives a BGP Default and ISP B gives me the full table, can my router use the information it receives from ISB B to know what IP's are easier accessed through ISP A? Details: I'm trying to set up BGP sessions with two…
Cosmin Prund
  • 252
  • 2
  • 7
3
votes
1 answer

Where can I get fresh routing registry data for IP:ASN and AS lookups?

I'm interested in maintaining a copy of the type of data available at ftp://ftp.arin.net/pub/rr/arin.db however the arin.db file seems to be missing quite a few resources which are available via the ARIN Whois-RWS search. While it isn't out of the…
danlefree
  • 2,923
  • 1
  • 19
  • 20
1 2
3
…
11 12