Information Technology Reference
In-Depth Information
Table 9-10 outlines the problem that might cause this symptom and describes solutions to that problem.
Table9-10
ARA: Slow Performance from Dialin Connection
Possible Problems
Solution
Flow control is not enabled, is
enabled only on one device
(either DTE or DCE), or is
misconfigured
Configure hardware flow control on the line
using the
flowcontrol hardware
line
configuration command. Hardware flow control
is recommended for access server-to-modem
connections.
1.
Flow control is not enabled, is
enabled only on one device
(either DTE or DCE), or is
misconfigured
(continued)
For example, to configure hardware flow control on
line 2 of an access server, enter the following
commands:
C2500(config)#
line 2
C2500(config-line)#
flowcontrol hardware
Note:
If you cannot use flow control, limit the line
speed to 9600 bps. Faster speeds can result in lost
data.
2.
After enabling hardware flow control on the
access server or router line, initiate a reverse
Telnet session to the modem via that line.
For instructions on initiating a reverse Telnet
session, see the section “Establishing a Reverse
Telnet Session to a Modem” in Chapter 16,
“Troubleshooting Dialup Connections.”
3.
Use a modem command string that includes the
RTS/CTS flow command for your modem. This
command ensures that the modem is using the
same method of flow control (that is, hardware
flow control) as the Cisco access server or
router. See your modem documentation for
exact configuration command syntax.
For more information about troubleshooting access
server- to-modem connections, see Chapter 16,
“Troubleshooting Dialup Connections.” For
information on troubleshooting hardware problems,
see Chapter 3, “Troubleshooting Hardware and
Booting Problems.”
