This section provides a brief overview of the tasks that must be performed to configure BGP and provides the CLI commands. To enable BGP, one AS must be configured and at least one group must be configured which includes neighbor (system or IP address) and peering information ASN.
Configure BGP hierarchically, the global level (applies to all peers), the group level (applies to all peers in peer-group), or the neighbor level (only applies to specified peer). By default, group members inherit the group’s configuration parameters although a parameter can be modified on a per-member basis without affecting the group-level parameters.
Many of the hierarchical BGP commands can be used on different levels. The most specific value is used. That is, a BGP group-specific command takes precedence over a global BGP command. A neighbor-specific statement takes precedence over a global BGP or group-specific command.
All BGP instances must be explicitly created on each node. When created, BGP is administratively enabled.
Configuration planning is essential to organize ASs and the 7210 SAS nodes within the ASs, and determine the internal and external BGP peering.
To configure a basic autonomous system, perform the following tasks: