Deployment Guide

362 | Border Gateway Protocol IPv4 (BGPv4)
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neighbor fall-over
e c s
Enable or disable fast fall-over for BGP neighbors.
Syntax
neighbor {ipv4-address | peer-group-name} fall-over
To disable, use the no neighbor {ipv4-address | peer-group-name} fall-over command.
Parameters
Defaults
Disabled
Command Modes
ROUTER BGP
Usage
Information
When fall-over is enabled, BGP keeps track of IP or IPv6 reachability to the peer remote address and
the peer local address. Whenever either address becomes unreachable (i.e, no active route exists in the
routing table for peer IP or IPv6 destination/local address), BGP brings down the session with the peer.
Related
Commands
Command
History
neighbor filter-list
c e s
Configure a BGP filter based on the AS-PATH attribute.
Syntax
neighbor {ip-address | peer-group-name} filter-list as-path-name {in | out}
To delete a BGP filter, use the no neighbor {ip-address | peer-group-name} filter-list
as-path-name {in | out} command.
Parameters
Defaults
Not configured.
Command Modes
ROUTER BGP
ipv4-address
Enter the IP address of the neighbor in dotted decimal format.
peer-group-name
Enter the name of the peer group.
show ip bgp neighbors Display information on the BGP neighbors
Version 7.8.1.0 Introduced support on S-Series
Version 7.7.1.0 Introduced support on C-Series
Version 7.4.1.0 Introduced
ip-address
Enter the IP address of the neighbor in dotted decimal format.
peer-group-name
Enter the name of the peer group to apply the filter to all routers in the
peer group.
as-path-name
Enter the name of an established AS-PATH access list (up to 140
characters).
If the AS-PATH access list is not configured, the default is permit (allow
routes).
in Enter the keyword in to filter inbound BGP routes.
out Enter the keyword out to filter outbound BGP routes.