IPv6 Essentials by Silvia Hagen

Author:Silvia Hagen
Language: eng
Format: mobi, epub, pdf
Tags: COMPUTERS / Networking / Network Protocols
Publisher: O'Reilly Media
Published: 2009-02-09T00:00:00+00:00

Because the NLRIs are IPv4 prefixes, this field can never be used to advertise IPv6 routes. See "BGP Multiprotocol Extension for IPv6" for further details.

BGP Attributes

Path attributes provide additional information about the advertised NLRI. Each path attribute has a 2-byte attribute header, as depicted in Figure 8-40.

Figure 8-40. The BGP path attributes

The following list explains the Path Attribute in detail:

O bit (Optional bit)

Defines whether the attribute is optional (set to 1) or well-known (set to 0). A well-known attribute must be recognized and supported by each BGP router. Optional attributes may not be recognized by some routers.

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