Restrictions on BGP NSR Support for iBGP Peers
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This feature applies to iBGP peers configured under IPv4 unicast or IPv4 + label address families.
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When you configure BGP with graceful restart and remove the BGP configuration using no router bgp command, the graceful restart timer starts. As a result, the stale entry is present in the BGP routing table and it is only removed after the BGP graceful restart timer is over.
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With BGP PIC edge enabled with additional paths on the system, the ha-mode sso prefer CLI command is not supported for the BGP neighbor and the opposite way.