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16 Cards in this Set
- Front
- Back
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Name at least three reasons why a path might be ignored by BGP. |
1. The NEXT_HOP is inaccessible 2. Paths that are marked as not synchronized 3. Paths from EBGP with our AS in the AS Path 4. You use bgp enforce-first-as 5. Paths that are marked as received-only |
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Name at least two factors that are analyzed before the AS_PATH length. |
1. Weight 2. LOCAL_PREF 3. Prefer the locally originated path |
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What is the first attribute examined by the BGP Best Path Selection Algorithm? |
Weight |
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With the Cisco attribute of weight, is a higher value preferred, or a lower value? |
The higher weight is more preferred. |
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With the LOCAL_PREF attribute, is a higher or lower value preferred? |
A higher LOCAL_PREF is preferred |
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What is the default LOCAL_PREF value? |
100 is the default LOCAL_PREF value |
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Is a longer or shorter AS_PATH preferred? |
A shorter AS_PATH is preferred |
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What decision immediately follows the AS_PATH length analysis? |
The lowest ORIGIN type |
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What ORIGIN type is the most preferred? |
IGP is the most preferred ORIGIN type; INCOMPLETE is the least preferred |
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Is a lower MED or higher MED preferred? |
A lower MED is preferred |
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Step 7 of the BGP Best Path Selection Algorithm examines EBGP versus IBGP paths. Which is preferred? |
EBGP paths are preferred over IBGP paths |
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In step 10 of the BGP Best Path Selection Algorithm, all paths are EBGP paths. What is the basis for the best path decision at this point? |
Prefer the oldest path |
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In step 11, the router ID of the sender is analyzed. What value of the router ID is preferred? |
The lower router ID is preferred |
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What is the final step of the BGP Best Path Selection Algorithm? (Step 13) |
Prefer the path that comes from the lowest neighbor address. |
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What is the first step in the BGP Best Path Selection Algorithm? |
Prefer the path with the highest weight |
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Name two path attributes that are considered before the AS_PATH length. |
WEIGHT and LOCAL_PREF |
