Cisco 675 - 675 Router, Инструкция по установке и эксплуатации

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6-7
Cisco 600 Series Installation and Operation Guide
78-11190-01
Chapter 6 Troubleshooting
Frequently Asked Questions about the WAN LNK LED
•
If the WAN LNK LED turns off after the CPE has successfully been
transferring data end-to-end for some time, this means that the CPE or the
service provider's equipment might have a timeout set. Use the
show errors
command to see if the error log shows that timeouts caused the drop. There
are two timeouts that could affect the WAN LNK LED:
–
IDLE timeout—This timeout can be set on the CPE or the service
provider's equipment. If the IDLE timeout is set to some value, then the
CPE WAN LNK LED will turn off if the CPE becomes idle for that
specified period of time. The
show timeout
command will display the
current timeout status and settings.
–
SESSION timeout—This timeout can be set on the CPE or the service
provider's equipment. If the SESSION timeout is set to some value, then
the CPE WAN LNK LED will turn off after that certain period of set time
whether it is idle or not. The
show timeout command will display the
current timeout status and settings.
•
If the WAN LNK LED goes solid for approximately four seconds and then
turns off, this primarily points to a RADIUS problem. After the CPE trains
and the service provider's equipment that is being used to authenticate its PPP
session is using RADIUS, then this could point to a failed RADIUS
authentication. Possible reasons for a failed RADIUS authentication include:
–
Service provider's equipment has the wrong IP address for the RADIUS
server.
–
Username and password on the CPE do not match the username and
password running on the RADIUS server's user list.
–
RADIUS server is not running.
Disabling RADIUS on the service provider's equipment would be a simple
test to see if it is a RADIUS problem.
The show interface wan0 command provides feedback on the wan0 configuration
as well as the actual configuration negotiated with the central office equipment as
shown here:
cbos# show interface wan0
wan0 ADSL Physical Port
Line Trained
Actual Configuration:
Overhead Framing: 3
Trellis Coding: Disabled
Standard Compliance: T1.413
Downstream Data Rate: 8032 Kbps