BGP Listen Range Command
BGP Dynamic Neighbors are a way to bring up BGP neighbors without specifically defining the neighbors remote IP address. Using the BGP Listen Range command you specify a range of IP addresses …
BGP Routing Explained
BGP Weight Attribute Configuration Tutorial
BGP Weight Attribute Explained The BGP weight attribute is the first on the list in the BGP best path algorithm Prefer the path with the highest WEIGHT. Note: BGP Weight is a Cisco-specific …
Peering with Route Servers
As your network grows bigger and your internet traffic grows, it starts to make sense to peer directly with other networks rather than simply pay an ISP to deliver all that traffic. Peering is one of …
BGP VPNv4 Troubleshooting Commands
When working with MPLs Layer 3 VPN a lot of people get stuck with the verification, simply because they don’t know the bgp vpnv4 troubleshooting commands. This post will step through some of the …
BGP Peer in wrong AS
When configuring BGP with a remote peer you might get the error message BGP peer in wrong AS *Apr 18 08:39:15.455: %BGP-3-NOTIFICATION: received from neighbor 10.0.12.2 passive 2/2 (peer in wrong AS) …
BGP Local Preference
BGP Local Preference Explained Local preference is the second BGP attribute and is used to choose the exit path for an autonomous system. The BGP preference has to be set inbound on routes …
BGP Confederation vs Route Reflector
To achieve a full mesh of iBGP peerings between more than a few devices becomes quite an administrative challenge. To overcome this you have two tools at your disposal. BGP Confederation and Route …
What is BGP Synchronization?
A BGP router with synchronization enabled does not install iBGP learned routes into its routing table if it is not able to validate those routes in its IGP. The BGP syncronization rule states that if …
BGP Update Source
If you have started to look at BGP you will very soon come across the BGP update-source command. This command tells BGP which interface to source the BGP packets out of. The short demo below will …
Where is the BGP Best Path Selection Algorithm
If you are trying to find the BGP best path selection algorithm on the DOC CD it has been removed from the 12.4 documentation for some crazy reason! You will need to go to this link …