BGP Routing Policies - BGP Communities - Filtering NLRIs Using Special COMMUNITY Values
7 important questions on BGP Routing Policies - BGP Communities - Filtering NLRIs Using Special COMMUNITY Values
What are the COMMUNITY Values Used especially for NLRI Filtering?
NO_ADVERT FFFF:FF02
LOCAL_AS/NO_EXPORT_SUBCONFED(RFC 1997) FFFF:FF03
What does the COMMUNITY Value NO_EXPORT mean and what is the value?
-Do not advertise outside this AS
-Can be advertised to other confederation autonomous systems
AS 1 could advertise eBGP route into AS 2 only
AS2 will only advertise route inside AS 2
What does the COMMUNITY Value NO_ADVERT mean and what is the value?
-Do not advertise to any iBGP peer
Router 1 can advertise a route to Router 2
Router 2 will not advertise to any other router
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What does the COMMUNITY Value LOCAL_AS mean and what is the value?
-Do not advertise outside the local confederation sub-AS
When can the COMMUNITY LOCAL_AS be used?
When can the COMMUNITY NO_ADVERT be used?
What is the command to check the routes with NO_EXPORT/NO_ADVERT/LOCAL_AS
show ip bgp community no-advertise
show ip bgp community local-as
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