This command prevents the router from ever trying to open a BGP connection with the specified peer.
| ip-address | Specifies the BGP peer as a valid IPv4 address in dotted-quad format or as a valid IPv6 address in colon-separated format . |
None.
BGP Router Configuration.
The neighbor passive command prevents the S- and 7100-Series router from trying to initiate a BGP connection with the specified peer. Instead, the router will wait for the peer to initiate a connection.
This command was introduced to handle a problem in BGP3 and earlier, in which two peers might both attempt to initiate a connection at the same time. This problem has been corrected in the BGP4 protocol, and, thus, this command is not needed with BGP 4 sessions.
Note
If the neighbor passive command is applied to both sides of a peering session, the session will never be established. For this reason, and because it is generally not needed for a BGP 4 session, the use of neighbor passive is discouraged.In the following example, BGP will never initiate a connection with peer 1.2.3.4:
System(su-config)->router bgp 65151 System(su-config-bgp)->bgp router-id 159.1.1.9 System(su-config-bgp)->neighbor 1.2.3.4 remote-as 5 System(su-config-bgp)->neighbor 1.2.3.4 passive
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