Deployment Guide

IPv6 Border Gateway Protocol (IPv6 BGP) | 787
neighbor fall-over
c e
Enable or disable fast fall-over for BGP neighbors.
Syntax
neighbor {ipv6-address | peer-group-name} fall-over
To disable, use the no neighbor {ipv6-address | peer-group-name} fall-over command.
Parameters
Defaults
Disabled
Command Modes
ROUTER BGP
Command
History
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
neighbor filter-list
c e
Configure a BGP filter based on the AS-PATH attribute.
Syntax
neighbor {ipv6-address | peer-group-name} filter-list as-path-name {in | out}
To delete a BGP filter, use the no neighbor {ipv6-address | peer-group-name} filter-list
as-path-name {in | out} command.
Parameters
Defaults
Not configured.
ipv6-address Enter the IPv6 address in the x:x:x:x::x format.
The
:: notation specifies successive hexadecimal fields of zeros.
peer-group-name
Enter the name of the peer group.
Version 8.4.2.1 Introduced on C-Series and S4810.
Version 8.2.1.0 Introduced on E-Series ExaScale
Version 7.4.1.0 Introduced on E-Series TeraScale
show ip bgp ipv6 unicast
neighbors
Display IPv6 routing information exchanged by BGP neighbors.
ipv6-address Enter the IPv6 address in the x:x:x:x::x format.
The
:: notation specifies successive hexadecimal fields of zeros.
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.
If the AS-PATH access list is not configured, the default is permit (to
allow routes). (16 characters maximum)
in Enter the keyword in to filter inbound BGP routes.
out Enter the keyword out to filter outbound BGP routes.