After the session is re-established between the BGP GR helper and its neighbor, original forwarding entries are deleted.
After the session is re-established between the BGP GR helper and its neighbor, original forwarding entries are deleted.
In BGP Graceful Restart (GR) mechanism, when a session is re-established between the BGP GR helper and its neighbor, the original forwarding entries are not deleted immediately. Instead, these entries are retained to ensure continuity of data flow and to prevent traffic loss during the restart process. The GR helper maintains these entries until it can update them based on new routing information received after the session is re-established.
BGP Configuration - IP Unicast Routing - Huaweisupport.huawei.com › ... › Configuration Guide Jan 16, 2019 - After establishing a BGP peer relationship with a neighbor, the BGP device follows ... First, original IBGP attributes are retained, including the Local_Pref ... the GR helper does not delete the routing information and forwarding entries ... time, the sessions between the device and its peers are reestablished.