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BGP routers establish BGP sessions through the OPEN message
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OPEN message contains
optional parameters
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BGP session is terminated if OPEN parameters are not
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recognised
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New parameter: CAPABILITIES
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Multiprotocol
extension
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Multiple
routes for same destination
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Configures router to negotiate either or both NLRI
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If
neighbor configures both or subset, common NRLI is used in both
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directions
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If
there is no match, notification is sent and peering doesn’t come up
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If
neighbor doesn’t include the capability parameters in open, session
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backs
off and reopens with no capability parameters
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Peering
comes up in unicast-only mode
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