Layer 3 Routing Commands 1231User GuidelinesBGP tracks the reachability of each internal peer’s IP address. If a peerbecomes unreachable (that is, the RIB no longer has a non-default route tothe peer’s IP address), BGP drops the adjacency.Command HistoryIntroduced in version 6.2.0.1 firmware.Exampleconsole(config-router)# bgp fast-internal-falloverbgp listenUse the bgp listen command to create an IPv4 listen range and associates itwith the specified peer template. The bgp listen command also activates theIPv4 or IPv6 BGP dynamic neighbors feature. Use the no form of thecommand to remove an IPv4 or IPv6 listen range.Syntaxbgp listen { limit max-number | range network/length [ inherit peer peer-template-name ] }no bgp listen { limit | range network/length [ inherit peer peer-template-name ] }• limit max-number — Sets a maximum limit number of IPv4 BGPdynamic subnet range neighbors. The number is from 1 to 100. Default is20.• range network/length — Specifies a listen subnet range that is to becreated. The IP prefix representing a subnet is specified by network, andlength is the subnet mask in bits. The network argument can be valid IPv4prefix (BGP Router Configuration mode or IPv4 Address FamilyConfiguration mode) or an IPv6 prefix (IPv6 Address FamilyConfiguration mode).• inherit peer peer-template-name — (Optional) Specifies a BGP peertemplate name that is to be associated with the specified listen subnetrange and inherited with dynamically created neighbors.
