364 CHAPTER 33: BGP CONFIGURATIONSwitch 8800 Family series provide various MBGP extended applications, includingextension of multicast, VPN, and so on. Different extended applications should beconfigured in their own address family views.For more information about the commands executed in MBGP address familyview, see "Multicast Protocol" and "MPLS Configuration" of this manual.BGP Peer and PeerGroupDefinition of peer and peer groupAs described in Section “BGP Routing Mechanism” “BGP Routing Mechanism”,BGP speakers among which messages are exchanged are peers to one another.Multiple related peers compose a peer group, and multiple related peers composea peer group.Relationship between peer configuration and peer group configurationIn Switch 8800 Family series, a BGP peer must belong to a peer group. If you wantto configure a BGP peer, you need first to create a peer group and then add a peerinto the group.BGP peer group feature can simplify user configuration and improve routeadvertisement efficiency. When added into a peer group, a peer inherits all theconfiguration of the group.If the configuration of a peer group changes, the configuration of its memberpeers also alters. Some attributes can be configured to a particular member peerby specifying its IP address. The attributes configured in this way is with higherpriority than those by configuring for peer group. It should be noted that allmember peers must use the same update policy as its group, but may use differentingress policy.Configuring BGP These categories are involved in BGP configuration:1 Basic BGP configuration■ “Enabling BGP”■ “Configuring Basic Features for BGP Peer”2 BGP peer configuration■ “Configuring application features of a BGP peer (group)”■ “Configuring Route Filtering of a Peer (group)”3 BGP route configuration■ “Configuring Network Routes for BGP Distribution”■ “Configuring the Interaction between BGP and IGP (Importing IGP Routes)”■ “Configuring to Permit BGP to Import Default Routes of Other Protocols”■ “Configuring BGP Route Aggregation”■ “Configuring BGP Route Filtering”■ “Configuring BGP Route Dampening”4 BGP protocol configuration■ “Configuring BGP Preference”
