Administrator Guide

To disallow and disconnect connections, use the no neighbor {ipv6-address | peer-group-
name} ebgp-multihop [ttl] command.
Parameters
ipv6-address Enter the IPv6 address in the x:x:x:x::x format.
NOTE: The :: notation specifies successive hexadecimal fields of zeros.
peer-group-name Enter the name of the peer group.
ttl (OPTIONAL) Enter the number of hops as the time to live (ttl) value. The range is 1
to 255. The default is 255.
Defaults Disabled.
Command Modes ROUTER BGP
Command
History
Version Description
9.9(0.0) Introduced on the C9010.
9.2(1.0) Introduced on the Z9500.
8.2.1.0 Introduced on the E-Series ExaScale.
7.4.1.0 Introduced
Usage
Information
To prevent loops, the neighbor ebgp-multihop command does not install default routes of the
multihop peer. Networks not directly connected are not considered valid for best path selection.
neighbor fall-over
Enable or disable fast fall-over for BGP neighbors.
C9000 Series
Syntax
neighbor {ipv6-address | peer-group-name} fall-over
To disable, use the no neighbor {ipv6-address | peer-group-name} fall-over command.
Parameters
ipv6-address Enter the IPv6 address in the x:x:x:x::x format.
NOTE: The :: notation specifies successive hexadecimal fields of zeros.
peer-group-name Enter the name of the peer group.
Defaults Disabled.
Command Modes ROUTER BGP
Command
History
Version Description
9.9(0.0) Introduced on the C9010.
9.2(1.0) Introduced on the Z9500.
8.2.1.0 Introduced on the E-Series ExaScale.
7.4.1.0 Introduced
Usage
Information
When you enable fall-over, BGP keeps track of IP or IPv6 reachability to the peer remote address and the
peer local address. Whenever either address becomes unreachable (for example, 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
show ip bgp neighbors – displays information on the BGP neighbors.
468 Border Gateway Protocol