Juniper JUNOSE, Configuration Manual

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Use to associate a textual description of up to 80 characters with a BGP neighbor
or peer group.
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If you specify a BGP peer group by using the peerGroupName argument, all the
members of the peer group inherit the characteristic configured with this
command unless it is overridden for a specific peer.
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This command takes effect immediately.
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Example
host1(config-router)# neighbor 10.11.0.5 description bostonmetropeer
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Use the no version to remove the description.
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See neighbor description
Logging Neighbor State Changes
You can force BGP to log a message whenever a peer enters or leaves the Established
state.
bgp log-neighbor-changes
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Use to log a notice message to the bgpNeighborChanges log when a neighbor
enters or leaves the Established state for any reason.
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The severity of the log message is notice by default.
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Issue the log destination console severity notice command to display the
messages on the console.
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This command takes effect immediately.
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Example
host1:3(config)# bgp log destination console severity notice
host1:3(config)# router bgp 100
host1:3(config-router)# bgp log-neighbor-changes
NOTICE 04/30/2001 21:06:22 bgpNeighborChanges (3,4.4.4.4): peer 4.4.4.4
in core leaves established state
NOTICE 04/30/2001 21:06:22 bgpNeighborChanges (3,5.5.5.5): peer 5.5.5.5
in core leaves established state
NOTICE 04/30/2001 21:06:22 bgpNeighborChanges (3,6.6.6.6): peer 6.6.6.6
in core leaves established state
NOTICE 04/30/2001 21:06:22 bgpNeighborChanges (3,13.13.13.1): peer
13.13.13.1 in core leaves established state
NOTICE 04/30/2001 21:06:31 bgpNeighborChanges (3,4.4.4.4): peer 4.4.4.4
in core enters established state
NOTICE 04/30/2001 21:06:31 bgpNeighborChanges (3,5.5.5.5): peer 5.5.5.5
in core enters established state
NOTICE 04/30/2001 21:06:31 bgpNeighborChanges (3,6.6.6.6): peer 6.6.6.6
in core enters established state
NOTICE 04/30/2001 21:06:31 bgpNeighborChanges (3,13.13.13.1): peer
13.13.13.1 in core enters established state
Configuring BGP Peer Groups
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Chapter 1: Configuring BGP Routing