The flashcards below were created by user
weisunc
on FreezingBlue Flashcards.
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Step 0
- Next hop: is it reachable?
- If no route to reach Next_Hop, router cannot use this route.
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Step 1
- Weight
- Bigger is better; Cisco proprietary
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Step 2
- LOCAL_PREF
- Bigger is better
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Step 3
- Locally injected routes;
- Locally injected is better than iBGP/eBGP learned
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Step 4
AS_PATH length; Smaller
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Step 5
Origin; Favor internal over external, external over ?
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Step 7
- Neighbor Type
- Prefer eBGP over iBGP
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Step 8
- IGP metric to Next_Hop;
- Smaller
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Step 9
Oldest (longest-known) eBGP route
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Step 10
Lowest neighbor BGP RID
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Step 11
Lowest neighbor IP address
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Idle
The BGP process is either administratively down or awaiting the next retry at-tempt.
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Connect
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.
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Active
The TCP connection has been completed, but no BGP messages have beensent to the peer yet.
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Opensent
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.
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Openconfirm
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).
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Established
All neighbor parameters match, the neighbor relationship works, and the peerscan now exchange Update messages.
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