BGP Decision Process
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- Next hop: is it reachable?
- If no route to reach Next_Hop, router cannot use this route.
- Bigger is better; Cisco proprietary
- Bigger is better
- Locally injected routes;
- Locally injected is better than iBGP/eBGP learned
AS_PATH length; Smaller
Origin; Favor internal over external, external over ?
- Neighbor Type
- Prefer eBGP over iBGP
- IGP metric to Next_Hop;
Oldest (longest-known) eBGP route
Lowest neighbor BGP RID
Lowest neighbor IP address
The BGP process is either administratively down or awaiting the next retry at-tempt.
The BGP process is waiting for the TCP connection to be completed. You can-not determine from this state information whether the TCP connection cancomplete.
The TCP connection has been completed, but no BGP messages have beensent to the peer yet.
The TCP connection exists, and a BGP Open message has been sent to thepeer, but the matching Open message has not yet been received from theother router.
An Open message has been both sent to and received from the other router.The next step is to receive a BGP Keepalive message (to confirm all neighbor-related parameters matched) or BGP Notification message (to learn there issome mismatch in neighbor parameters).
All neighbor parameters match, the neighbor relationship works, and the peerscan now exchange Update messages.
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