Administrator Guide

Version Description
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
7.8.1.0 Introduced on the S-Series.
7.7.1.0 Introduced on the C-Series.
Usage
Information
To prevent loops, the neighbor ebgp-multihop command does not install the 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 {ipv4-address | peer-group-name} fall-over
To disable, use the no neighbor {ipv4-address | peer-group-name} fall-over command.
Parameters
ipv4-address Enter the IP address of the neighbor in dotted decimal format.
peer-group-name Enter the name of the peer group.
Defaults Disabled.
Command Modes ROUTER BGP
Command
History
This guide is platform-specific. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.9(0.0) Introduced on the C9010.
9.2(1.0) Introduced on the Z9500.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
7.8.1.0 Introduced on the S-Series.
7.7.1.0 Introduced on the C-Series.
7.4.1.0 Introduced
Usage
Information
When you enable failover, BGP keeps track of IP or IPv6 ability to reach 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 the 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.
368 Border Gateway Protocol