Enabling Lenient Behavior - Juniper BGP - CONFIGURATION GUIDE V 11.1.X Configuration Manual

JUNOSe 11.1.x BGP and MPLS Configuration Guide
neighbor activate
If you have configured some or all neighbors to be in the multicast or VPN-IPv4
address families, you can quickly configure all neighbors to be part of the IPv4 unicast
address family by issuing the bgp default ipv4-unicast command.

Enabling Lenient Behavior

You can use the neighbor lenient command to enable the BGP speaker to attempt
to recover from malformed packet errors and finite state machine errors generated
by a peer. If BGP can recover from the error, it logs a warning message and attempts
to maintain the session with the peer. The normal, nonlenient behavior is for the
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Configuring BGP Peer Groups
host1:vr1(config-router-af)#exit-address-family
There is no no version.
See exit-address-family.
Use to specify a peer or peer group with which routes of the current address
family are exchanged.
A peer or peer group can be activated in more than one address family. By
default, a peer is activated only for the IPv4 unicast address family.
The peer or peer group must be created in unicast IPv4 before you can activate
it in another address family.
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.
The address families that are actively exchanged over a BGP session are
negotiated when the session is established.
This command takes effect immediately. If dynamic capability negotiation was
not negotiated with the peer, the session is automatically bounced so that the
exchanged address families can be renegotiated in the open messages when the
session comes back up.
If dynamic capability negotiation was negotiated with the peer, BGP sends a
capability message to the peer to advertise or withdraw the multiprotocol
capability for the address family in which this command is issued. If a neighbor
is activated, BGP also sends the full contents of the BGP routing table of the newly
activated address family.
Example
host1:vr1(config-router-af)#neighbor 192.168.1.158 activate
Use the no version to indicate that routes of the current address family are not
to be exchanged with the peer. Use the default version to remove the explicit
configuration from the peer or peer group and reestablish inheritance of the
feature configuration.
See neighbor activate.