1-35policies (if any), to filter updates to the BGP speaker, thus reducing the number of exchanged Updatemessages and saving network resources.After you enable the BGP ORF capability, the local BGP router negotiates the ORF capability with theBGP peer through Open messages (that is, determine whether to carry ORF information in messages;if yes, whether to carry non-standard ORF information in the packets). After completing the negotiationprocess and establishing the neighboring relationship, the BGP router and its BGP peer can exchangeORF information through specific Route-refresh messages.For the parameters configured on both sides for ORF capability negotiation, refer to Table 1-2.Follow these steps to enable the BGP ORF capability:To do… Use the command… RemarksEnter system view system-view —Enter BGP view bgp as-number —Enable BGP route refresh for apeer/peer grouppeer { group-name |ip-address }capability-advertiseroute-refreshRequiredEnabled by default.Enable the non-standard ORFcapability for a BGP peer/peergrouppeer { group-name |ip-address }capability-advertise orfnon-standardOptionalBy default, standard BGP ORFcapability defined in RFC 5291and RFC 5292 is supported.If the peer supports onlynon-standard ORF, you need toconfigure this command.Enable the ORF capability for aBGP peer/peer grouppeer { group-name |ip-address }capability-advertise orfip-prefix { both | receive |send }RequiredDisabled by default.Table 1-2 Description of the both, send, and receive parameters and the negotiation resultLocal parameter Peer parameter Negotiation resultreceivesendbothThe ORF sending capability is enabled locally andthe ORF receiving capability is enabled on the peer.sendreceivebothThe ORF receiving capability is enabled locally andthe ORF sending capability is enabled on the peer.both both Both the ORF sending and receiving capabilities areenabled locally and on the peer, respectively.Enabling Quick eBGP Session ReestablishmentIf the router receives no keepalive messages from a BGP peer within the holdtime, it disconnects fromthe peer.With quick eBGP connection reestablishment enabled, the router, when the link to a directly connectedeBGP peer is down, will reestablish a session to the eBGP peer immediately.
