Command Line Reference Guide

IPv6 Border Gateway Protocol (IPv6 BGP) | 711
Related
Commands
Command
History
bgp fast-external-fallover
c e s
Enable the fast external fallover feature, which immediately resets the BGP session if a link to a
directly connected external peer fails.
Syntax
bgp fast-external-fallover
To disable fast external fallover, enter no bgp fast-external-fallover.
Defaults
Enabled
Command Modes
ROUTER BGP
Command
History
Usage
Information
The bgp fast-external-fallover command appears in the show config command output.
bgp four-octet-as-support
c e s
Enable 4-byte support for the BGP process
Syntax
bgp four-octet-as-support
To disable fast external fallover, enter no bgp four-octet-as-support.
Defaults
Disabled (supports 2-Byte format)
Command Modes
ROUTER BGP
Usage
Information
Routers supporting 4-Byte ASNs advertise that function in the OPEN message. The behavior of a
4-Byte router will be slightly different depending on whether it is speaking to a 2-Byte router or a
4-Byte router.
When creating Confederations, all the routers in the Confederation must be 4 or 2 byte identified
routers. You cannot mix them.
Where the 2-Byte format is 1-65535, the 4-Byte format is 1-4294967295. Both formats are accepted,
and the advertisements will reflect the entered format.
show ip bgp ipv6 unicast
neighbors
Display IPv6 routing information exchanged by BGP neighbors.
show ip protocols View Information on routing protocols.
Version 8.4.2.1 Introduced on C-Series and S-Series.
Version 8.2.1.0 Introduced on E-Series ExaScale
Version 7.4.1.0 Introduced on E-Series TeraScale
Version 8.4.2.1 Introduced on C-Series and S-Series.
Version 8.2.1.0 Introduced on E-Series ExaScale
Version 7.4.1.0 Introduced on E-Series TeraScale