BGP的Community对于选择最优路径有什么作用？
正确答案:
BGP communitiy can be used to as tag of a set of routes. Those tags can be used for applying specific routing policy. Standard community does not affect best path selection of the local router.
The extended community ， which is called cost community，influences the BGP best path selection process at the point of insertion（POI）.By default，the POI follows the IGP metric comparison.Cost community is configured with a cost community ID and cost number.Path with the lowest cost community number will be prefered.If the cost community number is the same，path with the lowest cost community ID is prefered.
The extended community ， which is called cost community，influences the BGP best path selection process at the point of insertion（POI）.By default，the POI follows the IGP metric comparison.Cost community is configured with a cost community ID and cost number.Path with the lowest cost community number will be prefered.If the cost community number is the same，path with the lowest cost community ID is prefered.
答案解析:有
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