Users Guide

When two neighbors, configured with different keepalive and holdtime values, negotiate for new
values, the resulting values are as follows:
● the lower of the holdtime value is the new holdtime value, and
● whichever is the lower value; one-third of the new holdtime value, or the configured keepalive
value, is the new keepalive value.
neighbor update-source
Enable the system to use Loopback interfaces for TCP connections for BGP sessions.
C9000 Series
Syntax
neighbor {ip-address | peer-group-name} update-source interface
To use the closest interface, use the no neighbor {ip-address | peer-group-name}
update-source interface command.
Parameters
ip-address Enter the IP address of the peer router in dotted decimal format.
peer-group-name Enter the name of the peer group to disable all routers within the peer group.
interface Enter the keyword loopback then a number of the Loopback interface. The range
is from 0 to 16383.
Defaults Not configured.
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 ont he 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.
Usage
Information
Loopback interfaces are up constantly and the BGP session may need one interface constantly up to
stabilize the session. The neighbor update-source command is not necessary for directly
connected internal BGP sessions.
neighbor weight
Assign a weight to the neighbor connection, which is used to determine the best path.
C9000 Series
Syntax
neighbor {ip-address | peer-group-name} weight weight
372 Border Gateway Protocol