BigIron RX Series Configuration Guide 73753-1001986-01Configuring BGP4 26As a guideline, BigIron RX switches with a 2 GB Management 4 module can accommodate 150 –200 neighbors, with the assumption that the BigIron RX receives about one million routes totalfrom all neighbors and sends about eight million routes total to neighbors. For each additional onemillion incoming routes, the capacity for outgoing routes decreases by around two million.Configuring BGP4Once you activate BGP, you can configure the BGP options. On a BigIron RX there are twoconfiguration levels: global and address family.At the global level, all BGP configurations apply to IPv4 and IPv6. You enter this layer using therouter bgp command.Under the global level, you specify an address family. Address families separate the IPv4 and IPv6BGP configuration. You enter this level by entering the address-family command at the router bgplevel. The command requires you to specify the IPv4 or IPv6 network protocol.The address family command also requires you to select a sub-address family, which is the type ofroutes for the configuration. You specify multicast or unicast routes.FIGURE 112 BGP configuration levelsTable 26.1 shows what commands are available at the various BGP configuration levels.TABLE 118 IPv4 BGP commands at different configuration levelsCommand Global(iPv4 andIPv6)IPv4 addressfamily unicastIPv4 addressfamilymulticastSeeaddress-family x x x “Entering and exiting the address familyconfiguration level” on page 741address-filter x “Filtering specific IP addresses” on page 742aggregate-address x x “Aggregating routes advertised to BGP4neighbors” on page 749always-compare-med x “Configuring the device to always compareMEDs” on page 749as-path-filter xrouter bgp Global commands for BGPand all address familiesaddress-familyIPv4address-familyIPv6 unicastCommands for IPv6BGP unicast routesunicastCommands for IPv4MBGP routesmulticastCommands for IPv4BGP unicast routes
