host1(config-router)#
default neighbor 10.19.7.8 soft-reconfiguration inbound
The
default
version returns the peer to inheriting the peer group configuration. Because
inbound soft-reconfiguration is still enabled for lisbon, it is now also enabled for peer
10.19.7.8.
host1(config-router)#
default neighbor lisbon soft-reconfiguration inbound
Finally, this last command returns the peer group configuration to the default value,
disabling inbound soft-reconfiguration. The peer 10.19.7.8 inherits this value.
Example 2
For category C and D commands, the behavior of the
no
version of the command is the
same as the behavior of the
default
version of the command. The following example
illustrates this behavior and the inheritance concept for the
neighbor timers
command.
By default, the BGP global keepalive timer is 30 seconds and the global hold-time timer
is 90 seconds.
host1(config-router)#
neighbor eastcoast peer-group
host1(config-router)#
neighbor 10.10.21.23 peer-group eastcoast
Peer group eastcoast and peer 10.10.21.23 both have the default timer values. The peer
group inherits the global timer values; the peer is a member of eastcoast and inherits the
timer values from the peer group.
host1(config-router)#
neighbor eastcoast timers 15 40
Now peer group eastcoast has a keepalive timer of 15 seconds and a hold-time timer of
40 seconds. Peer 10.10.21.23 inherits these values from the peer group.
host1(config-router)#
no neighbor 10.10.21.23 timers
Now peer 10.10.21.23 has its timers reset to the global values of 30 and 90 seconds. The
configuration of an individual peer takes precedence over the configuration of the peer
group to which the peer belongs, which in turn takes precedence over the global
configuration.
host1(config-router)#
default neighbor 10.10.21.23 timers
Nothing changes. For commands in categories C and D, the behavior of the
default
version
is the same as the
no
version. Peer 10.10.21.23 still has the global timer values.
host1(config-router)#
neighbor eastcoast timers 20 20
The eastcoast peer group now has timer values of 20 seconds. Peer 10.10.21.23 still has
the global timer values.
Limitations on Inheritance
All BGP peers that are members of the same peer group must send essentially the same
updates. Accordingly, all members of a peer group must be the same kind of peer; that
is, all must be internal peers, all must be external peers, or all must be confederation
peers.
Copyright © 2010, Juniper Networks, Inc.
24
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