Users Guide

Table Of Contents
BGP 1351
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| Global Administrator (cont.) | Local Administrator |
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The value of the high-order octet of this extended type is either 0x01 or 0x41.
The low-order octet of this extended type is used to indicate sub-types.
The Value field consists of two sub-fields:
Global Administrator sub-field: 4 octets
This sub-field contains an IPv4 unicast address assigned by one of the
Internet registries.
Local Administrator sub-field: 2 octets
The organization that has been assigned the IPv4 address in the Global
Administrator sub-field can encode any information in this sub-field. The
format and meaning of this value encoded in this sub-field should be
defined by the sub-type of the community.
Types of Extended Communities
Dell EMC Networking BGP recognizes and honors the following well-known
extended community attributes from RFC 4360:
Route target community
Route origin community
Route Target Community
The Route Target Community identifies one or more routers that may receive
a set of routes (attached with this community) carried by BGP. This
community is transitive across the Autonomous System boundary.
The value of the high-order octet of the Type field for the Route Target
Community can be 0x00, 0x01 or 0x02. The value of the low-order octet
(Sub-type) of the Type field for this community is 0x02 (if represented in
Two-octet AS specific format) and 0x102 (if represented in IPv4 address
specific format).
Possible uses of the Route Target Community attribute are described in the
following sections.