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Advanced Configuration and Management Guide
Table 10.6: BGP4 Neighbor Information (Continued)
EBGP/IBGP Whether the neighbor session is an IBGP session, an EBGP session,
or a confederation EBGP session.
• EBGP – The neighbor is in another AS.
• EBGP_Confed – The neighbor is a member of another sub-AS in
the same confederation.
• IBGP – The neighbor is in the same AS.
RouterID The neighbor’s router ID.
PeerGroup The name of the peer group the neighbor is in, if applicable.
State The state of the router’s session with the neighbor. The states are
from this router’s perspective of the session, not the neighbor’s
perspective. The 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
messages 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.
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