bgp 1.0 Flashcards
Q
A
What is criterion 0 for the start of the best path selection for an NLRI?
The Next hop needs to be reachable
BGP Attributes
Weight, Local Pref, Locally originated, AS Path, Origin, MED, External over internal, Lowest IGP Cost, Tie Breakers
What is the tie break for external routes?
The oldest route wins
What is the tie break for internal routes?
The smallest BGP router ID wins
Is it possible for two BGP routers to have the same router ID?
True
If a prefix is originated from a router with the same router ID but from different cluster lists, which route should be chosen as the best? If the cluster list is the same?
Prefers the smallest cluster list, Prefers the smallest neighbor IP address
What are the points of application for BGP policies?
Global, Neighbor, Prefix
What is the weight value for locally injected and remotely injected routes?
Local 32768, Remote 0
Is it not possible to apply weight per neighbor?
False, it is possible
What is the default value of the local preference attribute?
100
Does LP also affect subASes?
True
How is the origin attribute evaluated?
i > e > ?, IGP better than EGP better than incomplete
What is the default MED value?
There is no default value, IOS considers 0 as the best metric
Is it possible to change the MED to consider a prefix without MED as having the worst possible metric instead of the best?
True