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Dell SmartFabric OS10 User Guide Release 10.5.3

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Constructing the Next Hop field

A BGP speaker advertises to its peers the global IPv6 address of the Next Hop present in the network address of the Next Hop field.

This global IPv6 address is followed by the link-local IPv6 address of the Next Hop.

The length of the Next Hop network address field on a MP_REACH_NLRI attribute is set to 16 when only a global address is present. The length of this field is set to 32 if a link-local address is also included in the Next Hop field.

The link-local address is included in the Next Hop field only if the BGP speaker shares a common subnet with the entity that is identified by the global IPv6 address that is carried in the network address of the Next Hop field and also the peer to which the route is being advertised to.


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