Users Guide

Usage
Information
Timer values configured with the neighbor timers command override the timer values configured
with any other command.
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 E-Series software to use Loopback interfaces for TCP connections for BGP sessions.
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, see the relevant Dell
Networking OS Command Line Reference Guide.
Version Description
9.8(2.0) Introduced on the S3100 series.
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000–ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
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.
Neighbors are sorted according to the source and destination ip addresses. If an update-source ip address
exists, then the source ip address determines the order in which the neighbors are displayed.
Border Gateway Protocol 375