Juniper J-Series Administration Manual page 140

J-series Services Router Administration Guide
Table 53: Summary of Key BGP Routing Output Fields (continued)
Field Values
Down Number of unavailable BGP peers.
Peers
Peer Address of each BGP peer.
InPkt Number of packets received from the peer,
OutPkt Number of packets sent to the peer.
Flaps Number of times a BGP session has changed state from
Down to Up .
Last Last time that a session became available or
Up/Down unavailable, since the neighbor transitioned to or from
the established state.
State A multipurpose field that displays information about
BGP peer sessions. The contents of this field depend
upon whether a session is established.
If a peer is not established, the field shows the
state of the peer session:
If a BGP session is established, the field shows the
number of active, received, and damped routes
that are received from a neighbor. For example,
indicates two active routes, four received
2/4/0
routes, and no damped routes.
BGP Neighbors
Peer Address of the BGP neighbor.
AS AS number of the peer.
Type Type of peer:
State Current state of the BGP session:
Active —BGP is initiating a TCP connection in an
attempt to connect to a peer. If the connection is
successful, BGP sends an open message.
Connect —BGP is waiting for the TCP connection
to become complete.
Established
established, and the peers are exchanging BGP
update messages.
Idle —This is the first stage of a connection. BGP
is waiting for a Start event.
OpenConfirm
an open message from the peer and is waiting to
receive a keepalive or notification message.
OpenSent
waiting to receive an open message from the peer.
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Using the Monitoring Tools
Active , Connect
or .
Internal External
—The BGP session has been
—BGP has acknowledged receipt of
—BGP has sent an open message and is
Additional Information
A high number of flaps might indicate a problem with
the interface on which the BGP session is enabled.
If the BGP session is unavailable, this time might be
useful in determining when the problem occurred.
, or Idle .
Generally, the most common states are
indicates a problem establishing the BGP conenction,
and Established , which indicates a successful session
setup. The other states are transition states, and BGP
sessions normally do not stay in those states for
extended periods of time.
, which
Active