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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.

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Filter OSPF routes redistributed by BGP

I am redistributing OSPF routes inside a network, through BGP. However I don't want to redistribute all the advertised routes from OSPF (specificaly the private networks) to the outside of the AS. How can I prevent some routes from being…
João Rodrigues
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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 from peers within that IX (also via BGP). I then…
cpjones44
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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 skip straight to a block of v6s to peer with these…
jduncanator
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Where do local ISPs' core networks connect to?

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)?
chris
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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 connected via a cross connect. I've setup a BGP…
WinkyWolly
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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 provider. How to made higher available server?
eri
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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 first need to understand what happened when I…
scrrr
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Cisco - redistribute prefix

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 RIPE permit 10 match ip address 50 set origin igp …
Moon
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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: "9121+ (one|two|three|...) (one|two|three|...)". This…
h0m3r
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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 memory corruption is the cause but I'm not…
Ryan
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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 link instead of the primary? Thanks W
Billy K
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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, and peering/transit/customer interconnections at…
lxgr
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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 layout: BGP setup: PAT1 and PAT2 each have a eBGP…
Andy Shinn
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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 prepending may or may not happen based on…
Hemanth
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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
user141610
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