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Dell SmartFabric OS10 User Guide Release 10.5.3

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Link-local-only-nexthop command at the BGP neighbor or template level

The link-local-only-nexthop command is also supported at the BGP neighbor and template level with the disable option.

Use this command to enable or disable link-local addresses that are entered in both fields of Next Hop for a particular unnumbered peer or unnumbered peers belonging to a peer-group. By default, this feature is not enabled for the unnumbered neighbor.

When you enable this feature globally and disabled it Neighbor level, precedence is given to the neighbor configuration. As a result, this feature is disabled for that unnumbered peer. Between neighbor and template configurations for this feature, precedence is given to the neighbor configuration.

When the neighbor configuration is in Default state , configuration at the template level, if any, applies. When both neighbor and template configurations are at the default state for this feature, the global configuration of the BGP unnumbered feature applies for all unnumbered peers present in all VRF instances.

The following table describes the BGP unnumbered configuration and its use cases:

Table 1. BGP unnumbered configurationBGP unnumbered configuration
Steps Feature configuration System behavior Use case
1 Globally enabled and not configured at the neighbor or template level. The link-local-only-nexthop command is enabled for all unnumbered peers in all VRFs. Use scenarios where all unnumbered sessions are with FRR-based implementations.
2 Globally enabled and disabled at the neighbor or template level. The link-local-only-nexthop command is enabled for all unnumbered peers in all VRFs except the unnumbered neighbors in a disabled configuration. Use where a few of the unnumbered sessions are with legacy SmartFabric OS10 implementation and this feature is not supported.
3 Globally disabled and enabled at neighbor or the template level. The feature is enabled only for unnumbered neighbors with enabled configuration. Use where only few unnumbered sessions are formed with the FRR implementation and other unnumbered sessions follow a legacy SmartFabric OS10 implementation.
4 Enabled at both the global and neighbor or template level. The link-local-only-nexthop command is enabled for all unnumbered peers in all VRFs. Use where all unnumbered sessions are with a FRR-based implementation.

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