BGP Routing Policies - Configuring BGP Policies
10 important questions on BGP Routing Policies - Configuring BGP Policies
What is the description and BGP PA type of PA Weight? 3
-Not advertised to peers
-Bigger is better
NO BGP PA type
What is the description and BGP PA type of PA LOCAL_PREF? 3
-Bigger is better
-Range 0 t/m 2 -32
BGP PA type Well-known discretionary
What is the default weight of a route locally injected into BGP?
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How does the feature Confedetarions the total number ASs in the AS_PATH length calculation?
How does the feature aggregate-address the total number ASs in the AS_PATH length calculation? 3
-If component have the same AS_PATHs, the summary route has the same AS_SEQ as the components
-IF AS-set command is set; it counts as one
What is the command to change the origin of a route?
match as-path 10
Set origin IGP/incomplete
What are the BGP rules for picking lowest router ID of advertising router? (step 10 of BGP process)
2. If only iBGP, lowest RID
1. Examine the eBGP routes only, picking the route advertised by the router with the lowest RID
2.If only iBGP routes exist, pick the router advertised by the router with lowest RID.
What does the command bgp bestpath compare-routerid and for what protocol is it used?
Only applies for eBGP routes
For an iBGP route, the decision is simply based on the lowest advertising router's RID
What are the rules when a router add multiple eBGP routes to the routing table for a single NLRI?
2. Maximum-paths number must be configured lager than 1 (maximum-path number)
3. Only eBGP routes whose adjacent ASNs are the same ASN as the best route are considered as candidates
4. If more candidates exist than called with maximum-paths, tiebreakers steps 10/11 determine the ones to use
What are the BGP maximum-paths command options
-maximum-paths ibgp number iBGP routes only
-maximum-paths eibgp number Both type, but mpls only
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