Juniper Networks J-Series - Manual (Page 140)

Table 53: Summary of Key BGP Routing Output Fields (continued)
Additional Information Values Field
Number of unavailable BGP peers. Down
Peers
Address of each BGP peer. Peer
Number of packets received from the peer, InPkt
Number of packets sent to the peer. OutPkt
A high number of flaps might indicate a problem with
the interface on which the BGP session is enabled. Number of times a BGP session has changed state from
Down to Up .
Flaps
If the BGP session is unavailable, this time might be
useful in determining when the problem occurred. Last time that a session became available or
unavailable, since the neighbor transitioned to or from
the established state. Last
Up/Down
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:
Active , Connect , or Idle .
■ 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,
2/4/0 indicates two active routes, four received
routes, and no damped routes.
State
BGP Neighbors
Address of the BGP neighbor. Peer
AS number of the peer. AS
Type of peer: Internal or External . Type
Generally, the most common states are Active , which
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.
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 —The BGP session has been
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 —BGP has acknowledged receipt of
an open message from the peer and is waiting to
receive a keepalive or notification message.
■ OpenSent —BGP has sent an open message and is
waiting to receive an open message from the peer.
State
118 ■ Using the Monitoring Tools
J-series™ Services Router Administration Guide