Operation Manual – Routing ProtocolH3C S5600 Series Ethernet Switches Chapter 5 BGP Configuration5-315.7 Configuring a Large-Scale BGP NetworkIn large-scale network, there are large quantities of peers. Configuring andmaintaining the peer becomes a big problem. Using peer group can ease themanagement and improve the routes sending efficiency. According to the differentASs where peers reside, the peer groups fall into IBGP peer groups and EBGP peergroups. For the EBGP peer group, it can also be divided into pure EBGP peer groupand hybrid EBGP peer group according to whether the peers in the EBGP groupbelong to the same exterior AS or not.Community can also be used to ease the routing policy management. And itsmanagement range is much wider than that of the peer group. It is AS-independent. Itcontrols the routing policy of multiple BGP routers.In an AS, to ensure the connectivity among IBGP peers, you need to set up fullconnection among them. When there are too many IBGP peers, it will cost a lot inestablishing a full connection network. Using RR or confederation can solve theproblem. In a large AS, RR and confederation can be used simultaneously.5.7.1 Configuration PrerequisitesBefore configuring a large-scale BGP network, ensure network layer connectivitybetween adjacent nodes.Before configuring a large-scale BGP network, you need to prepare the followingdata:z Peer group type, name, and the peers included.z If you want to use community, the name of the applied routing policy is needed.z If you want to use RR, you need to determine the roles (client, non-client) ofrouters.z If you want to use confederation, you need to determine the confederation ID andthe sub-AS number.5.7.2 Configuring BGP Peer GroupFollow these steps to configure a BGP peer group:To do... Use the command... RemarksEnter system view system-view —Enter BGP view bgp as-number —
