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Advanced Configuration and Management Guide
Table 10.4: BGP4 Summary Information (Continued)
State The state of this router’s neighbor session with each neighbor. The
states are from this router’s perspective of the session, not the
neighbor’s perspective. he state values are based on the BGP4
state machine values described in RFC 1771 and can be one of the
following for each router:
• IDLE – The BGP4 process is waiting to be started. sually,
enabling BGP4 or establishing a neighbor session starts the
BGP4 process.
• A minus sign (-) indicates that the session has gone down
and the software is clearing or removing routes.
• ADMND – The neighbor has been administratively shut down.
See “Administratively Shutting Down a Session with a BGP4
Neighbor” on page 10-22.
• A minus sign (-) indicates that the session has gone down
and the software is clearing or removing routes.
• CONNECT – BGP4 is waiting for the connection process for the
TCP neighbor session to be completed.
• ACTIVE – BGP4 is waiting for a TCP connection from the
neighbor.
Note: If the state frequently changes between CONNECT and
ACTIVE, there may be a problem with the TCP connection.
• OPEN SENT – BGP4 is waiting for an Open message from the
neighbor.
• OPEN CONFIRM – BGP4 has received an OPEN message from
the neighbor and is now waiting for either a KEEPALIVE or
NOTIFICATION message. f the router receives a KEEPALIVE
message from the neighbor, the state changes to Established.
the message is a NOTIFICATION, the state changes to Idle.
• ESTABLISHED – BGP4 is ready to exchange UPDATE packets
with the neighbor.
• If there is more BGP data in the TCP receiver queue, a plus
sign (+) is also displayed.
Note: If you display information for the neighbor using the
show ip bgp neighbor <ip-addr> command, the TCP
receiver queue value will be greater than 0.
Time The time that has passed since the state last changed.
RtRecv The total number or routes received in UPDATE messages from the
neighbor since the session was first established.
RtAcpt The number of routes received from the neighbor that this router
actually installed in the BGP4 route table. Usually, this number is
lower than the RoutesRcvd number. The difference indicates that this
router filtered out some of the routes received in the UPDATE
messages.
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