Troubleshooting Router Interfaces and Modules

Issues
Document ID: 71820

Contents
Introduction
Prerequisites
Requirements
Components Used
Conventions
Background Information
Basic Troubleshooting Steps
Modules Not Recognized
Routers and Supported Modules
Advanced Integration Modules
AIM Slots Clock Source Issues
AIMVPN/SSL Not Recognised
IMA Minimum Link Not Working
IMA Interface Flaps
Multiflex Trunk Voice and WAN Interface Cards
VWIC1MFTT1, VWIC2MFTT1 Hardware Installation
VWIC21MFTT1/E1, VWIC22MFTT1/E1 Hardware Installation
LCV and PCV Errors
Network Modules

NM1T3/E3 Installation Issues (DS3 Card)

Ethernet Switching Network Modules
Inline Power Issues
Troubleshooting Serial Interfaces
Related Information
Introduction
This document helps troubleshoot router interfaces and modules. The document also discusses the causes of
the problems, as well as basic procedures to troubleshoot, identify, and solve the problems.

Prerequisites
Requirements
There are no specific requirements for this document.

Components Used
The information in this document is based on the Cisco 2600, 2800, 3600, 3700, 3800, and 7200 Series
routers.

The information in this document was created from the devices in a specific lab environment. All the devices
used in this document started with a cleared (default) configuration. If your network is live, make sure that
you understand the potential impact of any command.

Conventions
Refer to Cisco Technical Tips Conventions for more information on document conventions.

Background Information
Most of the Cisco routers are modular access devices that contain a number of slots to connect the various
network modules. These are the common issues with the router modules:

The module is not recognized.

The router crashes.
The router does not boot.
The router hangs.

In this document, you can see basic steps to troubleshoot, identify, and isolate the module issues. You can also
see the most common issues and their solutions.

Basic Troubleshooting Steps

Modules Not Recognized
One of the common issues with the router interfaces and modules is that they are not recognized by the router.
These simple steps can help identify and resolve the module issues:

In order to verify hardware information for the network device, use the show diag command in EXEC
or privileged EXEC mode.

Router# show diag

3725 Backplane EEPROM:
PCB Serial Number : JAE0821JA9S
Processor type : 61
Top Assy. Part Number : 8001614702
Board Revision : D0
Fab Part Number : 28422606
Deviation Number : 6553565535
Manufacturing Test Data : FF FF FF FF FF FF FF FF
RMA Number : 255255255255
RMA Test History : FF
RMA History : FF
Chassis Serial Number : JMX0836L10L
Chassis MAC Address : 0011.218d.dd30
MAC Address block size : 48
Field Diagnostics Data : FF FF FF FF FF FF FF FF
Hardware Revision : 0.1
Number of Slots : 2
EEPROM format version 4
EEPROM contents (hex):
0x00: 04 FF C1 8B 4A 41 45 30 38 32 31 4A 41 39 53 09
0x10: 61 40 02 59 C0 46 03 20 00 3F 13 02 42 44 30 85
0x20: 1C 10 82 06 80 FF FF FF FF C4 08 FF FF FF FF FF
0x30: FF FF FF 81 FF FF FF FF 03 FF 04 FF C2 8B 4A 4D
0x40: 58 30 38 33 36 4C 31 30 4C C3 06 00 11 21 8D DD
0x50: 30 43 00 30 C5 08 FF FF FF FF FF FF FF FF 41 00
0x60: 01 01 02 FF FF FF FF FF FF FF FF FF FF FF FF FF
0x70: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
Slot 0:
 C3725 Mother board 2FE(TX)3W Port adapter, 4 ports
Port adapter is analyzed
Port adapter insertion time unknown
EEPROM contents at hardware discovery:
PCB Serial Number : JAE0821JA9S
Processor type : 61
Top Assy. Part Number : 8001614702
Board Revision : D0
Fab Part Number : 28422606
Deviation Number : 6553565535
Manufacturing Test Data : FF FF FF FF FF FF FF FF
RMA Number : 255255255255
RMA Test History : FF
RMA History : FF
Chassis Serial Number : JMX0836L10L
Chassis MAC Address : 0011.218d.dd30
MAC Address block size : 48
Field Diagnostics Data : FF FF FF FF FF FF FF FF
Hardware Revision : 0.1
Number of Slots : 2
Product (FRU) Number : C37252FE
EEPROM format version 4
EEPROM contents (hex):
0x00: 04 FF C1 8B 4A 41 45 30 38 32 31 4A 41 39 53 09
0x10: 61 40 02 59 C0 46 03 20 00 3F 13 02 42 44 30 85
0x20: 1C 10 82 06 80 FF FF FF FF C4 08 FF FF FF FF FF
0x30: FF FF FF 81 FF FF FF FF 03 FF 04 FF C2 8B 4A 4D
0x40: 58 30 38 33 36 4C 31 30 4C C3 06 00 11 21 8D DD
0x50: 30 43 00 30 C5 08 FF FF FF FF FF FF FF FF 41 00
0x60: 01 01 02 FF FF FF FF FF FF FF FF FF FF FF FF FF
0x70: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

WIC Slot 1:
Unknown WAN daughter card
WIC module not supported/disabled in this slot
Hardware Revision : 3.0
Part Number : 73579703
Board Revision : A0
Deviation Number : 00
Fab Version : 02
PCB Serial Number : FOC07160WZ2
RMA Test History : 00
RMA Number : 0000
RMA History : 00
Top Assy. Part Number : 8000931103
Connector Type : 01
Chassis MAC Address : 0004.dd0d.798c
MAC Address block size : 1
Product (FRU) Number : PAA24T1CT3ATM=
EEPROM format version 4
EEPROM contents (hex):
0x00: 04 FF 40 00 39 41 03 00 82 49 16 A5 03 42 41 30
0x10: 80 00 00 00 00 02 02 C1 8B 46 4F 43 30 37 31 36
0x20: 30 57 5A 32 03 00 81 00 00 00 00 04 00 C0 46 03
0x30: 20 00 24 5F 03 05 01 C3 06 00 04 DD 0D 79 8C 43
0x40: 00 01 FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x50: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x60: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x70: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

WIC Slot 2:
T1 (2 port) MultiFlex Trunk (Drop&Insert) WAN daughter card
Hardware revision 1.0 Board revision B0
Serial number 22688207 Part number 8000461402
FRU Part Number VWIC2MFTT1DI=
Test history 0x0 RMA number 000000
 Connector type PCI
EEPROM format version 1
EEPROM contents (hex):
0x20: 01 24 01 00 01 5A 31 CF 50 12 06 02 00 00 00 00
0x30: 58 00 00 00 01 01 18 00 FF FF FF FF FF FF FF FF

Slot 1:
High Density Voice Port adapter
Port adapter is disabled
Port adapter insertion time unknown
EEPROM contents at hardware discovery:
Hardware Revision : 1.1
Top Assy. Part Number : 8000356701
Board Revision : G0
Deviation Number : 031106
Fab Version : 02
PCB Serial Number : JAB0613089J
RMA Test History : 00
RMA Number : 0000
RMA History : 00
Product (FRU) Number : NMHDV=
EEPROM format version 4
EEPROM contents (hex):
0x00: 04 FF 40 00 CC 41 01 01 C0 46 03 20 00 0D EF 01
0x10: 42 47 30 80 00 00 79 82 02 02 C1 8B 4A 41 42 30
0x20: 36 31 33 30 38 39 4A 03 00 81 00 00 00 00 04 00
0x30: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x40: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x50: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x60: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x70: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

HDV SIMMs: Product (FRU) Number: PVDM12=

SIMM slot 0: Empty.
SIMM slot 1: Empty.
SIMM slot 2: Empty.
SIMM slot 3: Empty.
SIMM slot 4: Empty.

Slot 2:
4 PORT Voice PM for MARs Port adapter
Port adapter is analyzed
Port adapter insertion time unknown
EEPROM contents at hardware discovery:
Hardware revision 1.1 Board revision B0
Serial number 10379472 Part number 8000249102
FRU Part Number NM2V=
Test history 0x0 RMA number 000000
EEPROM format version 1
EEPROM contents (hex):
0x00: 01 65 01 01 00 9E 60 D0 50 09 BB 02 00 00 00 00
0x10: 58 00 00 00 98 09 13 17 FF FF FF FF FF FF FF FF
0x20: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x30: FF FF FF FF FF FF FF FF FF FF FF FF

VIC Slot 0:
FXS Voice daughter card (2 port)
Hardware revision 1.1 Board revision F0
Serial number 16172601 Part number 8000249301
FRU Part Number VIC2FXS=
Test history 0x0 RMA number 000000
Connector type Wan Module
EEPROM format version 1
EEPROM contents (hex):
0x20: 01 0E 01 01 00 F6 C6 39 50 09 BD 01 00 00 00 00
0x30: 78 0E F2 00 99 10 11 01 FF FF FF FF FF FF FF FF
 VIC Slot 1:
FXO Voice daughter card (2 port)
Hardware revision 1.1 Board revision K0
Serial number 27584010 Part number 8000249501
FRU Part Number VIC2FXO=
Test history 0x0 RMA number 000000
Connector type Wan Module
EEPROM format version 1
EEPROM contents (hex):
0x20: 01 0D 01 01 01 A4 E6 0A 50 09 BF 01 00 00 00 00
0x30: A0 00 00 00 02 05 09 01 FF FF FF FF FF FF FF FF

If the module's hardware information is not shown in the show diag, reseat the hardware module. You
can also install the module in a different slot. Some modules are not hot swappable; reload the router
after you install the module.
If the module's hardware information is shown in the show diag but you are not able to see the
module interfaces in the show run or show IP interface brief output, check the hardware installation
documentation. Some modules need router configuration after the installation.
In the show diag output, note the error message under the WIC 0 in the Slot 0. It is displayed as
"Unknown WAN daughter card" "WIC module not supported/disabled in this slot." This could be an
incompatible hardware issue. Check the Routers and Supported Modules section to make sure that the
module is supported by the router; also check the supported IOS version for that module.

Note: When you cold reboot the router, Cisco recommends that you wait at least 20 seconds before you turn
on the device.

Routers and Supported Modules

These links show the relevant interfaces and modules that are supported by the routers. The supported IOS
versions are also mentioned in the data sheet of the relevant interfaces and modules.

Cisco 3800 Series Integrated Services Routers

Cisco 2800 Series Integrated Services Routers
Cisco 7200 Series Routers
Cisco 7600 Series Routers
Cisco 3700 Series Multiservice Access Routers
Cisco 3600 Series Multiservice Platforms
Cisco 2600 Series Multiservice Platforms
Cisco 1800 Series Integrated Services Routers

Advanced Integration Modules

Three different types of AIMs are available for Cisco Modular access routers. These AIM modules
supplement the broad portfolio of Cisco Voice & Security solutions and allow enterprises and service
providers to implement ATM, Security, and Voice solutions on the routers.

ATM AIM called AIMATM: The AIMATM provides asynchronous transfer mode (ATM) services
to the WAN.
Voice AIM called AIMVOICE30: The AIMVOICE30 provides digital signal processor (DSP)
services, which can support up to 30 mediumcomplexity or 16 highcomplexity voice channels.
Voice + ATM AIM called AIMATMVOICE30: The AIMATMVOICE30 combines the
features from the AIMATM and AIMVOICE30 modules onto a single AIM module
 Voice Mail AIM called AIMCUE: The AIMCUE provides the Cisco Unity Express Voice
Mailboxes for the users.
VPN and SSL AIM called AIMVPN/SSL2 or AIMVPN/SSL3: The AIMVPN/SSL optimizes
the Cisco Integrated Services Router platforms for virtual private networks in both IP Security (IPSec)
and Secure Sockets Layer (SSL) Web and VPN deployments.

In this section, you will see some of the common issues related to the voice modules and interface cards. One
of the important steps in order to isolate the issue between the router modules and the line is to run the
Loopback test. Read the Loopback Tests for T1/56K Lines to test the circuit with the loopback test.

Note: The minimum IOS feature set required by AIMATM is IOS Plus. See the requirements and support in
the AIMATM, AIMVOICE30, and AIMATMVOICE30 modules.

Note: Compact flash can be installed only into an AIMVPN module and not into an AIMATM card.

AIM Slots Clock Source Issues

Cisco 2691, 3660, 3700, and 3800 routers have two AIM slots. When you create two IMA groups, you cannot
use two different clock sources because of the hardware limitation. Both of the AIM slots are in the same
clock domain as per the hardware design. This example shows that the ports 0/2/0 and 0/2/1 are configured in
IMA group 0, and the ports 0/3/0 and 0/3/1 are configured in IMA group 1. You can also see that the ports in
IMA group 0 (AIM slot 0) are configured to source the clock internally, and the ports in IMA group 1 (AIM
slot 1) are configured to source the clock from line. Because of the hardware limitation, the interface
ATM0/IMA1 will not come up.

Router# configure terminal

Router(config)# controller T1 0/2/0
Router(configcontroller)# mode atm aim 0
Router(configcontroller)# framing esf
Router(configcontroller)# linecode b8zs
Router(configcontroller)# clock source internal

Router(config)# controller T1 0/2/1

Router(configcontroller)# mode atm aim 0
Router(configcontroller)# framing esf
Router(configcontroller)# linecode b8zs
Router(configcontroller)# clock source internal

Router(config)# controller T1 0/3/0

Router(configcontroller)# mode atm aim 1
Router(configcontroller)# framing esf
Router(configcontroller)# linecode b8zs
Router(configcontroller)# clock source line primary

Router(config)# controller T1 0/3/1

Router(configcontroller)# mode atm aim 1
Router(configcontroller)# framing esf
Router(configcontroller)# linecode b8zs
Router(configcontroller)# clock source line primary

Router# show ima int br

Interface ATM0/IMA1 is down
Group index is 11
Ne state is insufficientLinks, failure status is insufficientLinksNe
IMA Group Current Configuration:
Tx/Rx minimum required links 1/1
Maximum allowed diff delay is 25ms, Tx frame length 128
Ne Tx clock mode CTC, configured timing reference link ATM0/0
Test pattern procedure is disabled
IMA Group Total Counters (time elapsed 0 seconds):
 0 Tx cells, 0 Rx cells
4 Ne Failures, 6 Fe Failures, 1735406 Unavail Secs
IMA link Information:
Link Physical Status NearEnd Rx Status

ATM0/3/0 up active
ATM0/3/1 up active

In order to resolve this issue, configure the router to derive the clock from one source. If the service provider
furnishes the clocking, configure all the ports to source the clock from the line. In the case of ATM
pointtopoint, the service provider will not furnish the clocking. In this case, configure one end to source the
clock internally, and configure the other end to source the clock from line.

Router(config)# controller T1 0/2/0

Router(configcontroller)# mode atm aim 0
Router(configcontroller)# framing esf
Router(configcontroller)# linecode b8zs
Router(configcontroller)# clock source internal
!
Router(config)# controller T1 0/2/1
Router(configcontroller)# mode atm aim 0
Router(configcontroller)# framing esf
Router(configcontroller)# linecode b8zs
Router(configcontroller)# clock source internal
!
Router(config)# controller T1 0/3/0
Router(configcontroller)# mode atm aim 1
Router(configcontroller)# framing esf
Router(configcontroller)# linecode b8zs
Router(configcontroller)# clock source internal
!
Router(config)# controller T1 0/3/1
Router(configcontroller)# mode atm aim 1
Router(configcontroller)# framing esf
Router(configcontroller)# linecode b8zs
Router(configcontroller)# clock source internal

AIMVPN/SSL Not Recognised

On Cisco series routers with an installed AIMVPN/SSL module, encryption can still be performed by the
main processor instead of the AIM. It could lead to a high CPU utilization on the routers. The reason for this
can be a hardware and software incompatibility issue, badly seated AIM, faulty AIM, or hardware failure on
the backplane.

The output of the show crypto engine config command is useful to determine the cause of the problem.

This is an example of the show crypto engine config command output with the incorrect Cisco IOS
Software installed:

Router#show crypto engine config

crypto engine name: unknown

crypto engine type: software
serial number: 59E1C9F9
crypto engine state: installed
crypto engine in slot: N/A

This is an example of a poorly seated AIM (all configuration hex values show 0):

Router#show crypto engine config

 crypto engine name: Virtual Private Network (VPN) Module
crypto engine type: hardware

Configuration: 0x000000000000000000000000
: 0x000000000000000000000000
: 0x000000000000000000000000
: 0x000000000000000000000000
CryptIC Version: 000.000
CGX Version: 000.000
CGX Reserved: 0x0000
PCDB info: 0x0000 0x0000 0x0000
Serial Number: 0x0000000000
: 0x0000000000
DSP firmware version: 000.000
DSP Bootstrap Version: 000.000
DSP Bootstrap Info: 0x0000

Compression: No
3 DES: Yes
Privileged Mode: 0x0000
Maximum buffer length: 4096
Maximum DH index: 0470
Maximum SA index: 0940
Maximum Flow index: 1880
Maximum RSA key size: 0000

This stepbystep procedure can help to resolve the issue:

Refer to the Software Support for Hardware (registered customers only) section of the Software
Advisor (registered customers only) to ensure that the Cisco IOS Software version is compatible
with the AIM. Also check whether a Data Encryption Standard (DES) or a Triple Data Encryption
Standard (3DES) image is loaded. The image name will include either "56i" for DES or "k9" for
3DES. This is an example of a DES image; c2600js56imz.1215.T9.bin is a DES image.
Try to reseat the AIM. For complete installation instructions, refer to AIM Installation Quick Start
Guide: Cisco 2600, 3600, and 3700 Series.
In order to verify that the card is now correctly detected, issue the show crypto engine config
command. The crypto engine type line will read hardware, and the configuration field will contain
valid hexadecimal numbers. This is a sample command output for an AIM:

router#show crypto engine config

crypto engine name: Virtual Private Network (VPN) Module

crypto engine type
: hardware

Configuration: 0x000109010F00F00784000000
: 0xA2112AB1AB68BA9C3992D377
: 0x295801AF4A12EFD108000300
: 0x00000000D78312B12546464B
CryptIC Version: 001.000
CGX Version: 001.009
CGX Reserved: 0x000F
PCDB info: 0x07F0 0x0084 0x0000
Serial Number: 0x11A2B12A68AB9CBA9239
: 0x77D35829AF01124AD1EF
DSP firmware version: 000.008
DSP Bootstrap Version: 000.003
DSP Bootstrap Info: 0x0000
Compression: No
3 DES: Yes
Privileged Mode: 0x0000
Maximum buffer length: 4096
Maximum DH index: 0470
 Maximum SA index: 0940
Maximum Flow index: 1880
Maximum RSA key size: 0000

Crypto Adjacency Counts:

Lock Count: 0
Unlock Count: 0
If the values in the Configuration field still show 0s, either the AIM module or the motherboard
is faulty and needs to be replaced.

IMA Minimum Link Not Working

After you group the T1 ports into an IMA group, the entire ATM0/IMA0 interface will go down if any one of
the ports is down. You can also configure the router with the command ima activeminimumlinks X,
where X is the number of T1 ports, such that the ATM0/IMA0 interface goes down only when X number of
links are down. For example, when you configure ima activeminimumlinks 3, the ATM0/IMA0 interface
will go down if three T1 ports are down. A Cisco router that runs 12.3 mainline software can experience
interoperability issues with some thirdparty ATM switches. In these cases, even though you configure ima
activeminimumlinks 3, the ATM0/IMA0 interface will go down if one of the three T1 ports goes down.
This issue is documented in the bug CSCeg09359 (registered customers only) and can be resolved if you
upgrade the Cisco IOS to the release mentioned in the bug.

IMA Interface Flaps

ATM Advanced Integration Module (AIM) modules installed in 2600/3600/3700 routers require some unique
clocking configuration to allow them to function properly. Failure to configure them properly results in errors
on the T1/E1 controller and Inverse Multiplexing (IMA) links, as well as in groups that flap continuously.

Typically, you see log messages which indicate that the interface and Permanent Virtual Circuit (PVC) has
flapped, as shown.

%ATM5UPDOWN: Interface ATM0/IMA0.1, Changing autovc 1/90 to PVC deactivated.

%ATM5UPDOWN: Interface ATM0/IMA0.1, Changing autovc 1/90 to PVC activated.

Errors that report Slip Secs can be seen if you issue the show controllers T1 or show controllers E1
command.

This is a sample output from the show controllers E1 command:

E1 0/1 is up.
Applique type is Channelized E1 balanced
No alarms detected.
alarmtrigger is not set
Version info Firmware: 20020812, FPGA: 11
Framing is CRC4, Line Code is HDB3, Clock Source is Line.
Data in current interval (363 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
85 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
85 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 88 15 minute intervals):
1 Line Code Violations, 2536 Path Code Violations,
18319 Slip Secs, 86 Fr Loss Secs, 1 Line Err Secs, 0 Degraded Mins,
18319 Errored Secs, 1 Bursty Err Secs, 0 Severely Err Secs, 87 Unavail Secs

In order to resolve this issue, configure a network clock source and participation for each WIC and AIM
module that is installed. Packet voice and video are sensitive to time delays. In order to prevent mismatches
and data slips, synchronize data flows to a single clock source, known as the network clock. When a network
clock is configured on a gateway, the router externally clocks one T1 or E1 port, and then passes that clock
signal across the backplane to another T1 or E1 port on another WIC or network module slot. Use of a
network clock on a gateway is configured if you name the network modules and interface cards that
participate in network clocking, and then select a controller to act as the source of timing for the network
clock.

The network clock provides timing from the source through the controller to the AIM, and then out to all the
router slots that participate. The Cisco 2600 series routers support one internal AIM slot, and the Cisco 3660
routers support two internal AIM slots. An AIM slot connects to both the main system bus and a secondary
timedivision multiplexing (TDM) bus that runs between the network module slots and, on the Cisco 2600
series, to the WAN interface card (WIC) slots.

For example, on a 2600 series switch with an AIMATM module and two VWICs used for IMA, configure
this way:

networkclockparticipate wic 0
networkclockparticipate wic 1
networkclockselect 1 T1 0/0

On the 2611, 2621, and 2651, the networkclockparticipate aim 0 is not required or supported because these
routers have only one AIM slot. On the 2691, 3600, or 3700, you must also include the
networkclockparticipate aim X command for each installed AIMATM module. For more information,
refer to AIMATM, AIMVOICE30, and AIMATMVOICE30 for the Cisco 2600 Series and Cisco
3660.

Multiflex Trunk Voice and WAN Interface Cards

VWIC1MFTT1, VWIC2MFTT1 Hardware Installation
The Cisco 1 and 2port T1/E1 Multiflex Voice/WAN Interface Cards ("Multiflex VWICs") support voice
and data applications in Cisco 2600, 2800, 3600, 3700, and 3800 multiservice routers. The common issue is
that you cannot see the router interfaces, such as ATMx/y or Serial 0/0:0 in the show runningconfiguration
or in the show interfaces output. This is normal behavior. After you install this card on the router, you can see
the Controller T0, T1, etc. interfaces in the router configuration file. These interface cards can be used for
different purposes. Configure these cards for their specific usage. VWIC cards can be used in the same way as
this configuration example:

It can be used as a standard WAN interface card like other Serial interface cards.

Router# configure terminal

Router(config)#controller T1 0/0
Router(configcontroller)# channelgroup 0 timeslots 124 speed 64 [64 | 56]

*Oct 20 13:11:45.230: %LINK3UPDOWN: Interface Serial0/0:0, changed state to do

wn
*Oct 20 13:11:46.230: %LINEPROTO5UPDOWN: Line protocol on Interface Serial0/0:
0, changed state to down

Router(configcontroller)# framing esf {sf | esf}

Router(configcontroller)# linecode b8sz {ami | b8zs}
Router(configcontroller)# clock source {line | internal}
Router(configcontroller)# no shutdown
Router(configcontroller)# end
Router# write

Router# configure terminal

Router(config)# interface Serial0/0:0
Router(configif)# ip address 192.168.1.2 255.255.255.0
Router(configif)# encapsulation hdlc [ppp | framerelay]
 Router(configif)# no shutdown
Router(configif)# end
Router# write
It can be used as part of the ATM IMA group. In this case, VWIC cards work with the AIMATM
hardware module.

Router(config)# controller T1 0/0

Router(configcontroller)# mode atm aim 0
Router(configcontroller)# framing esf
Router(configcontroller)# linecode b8zs
!
Router(config)# controller T1 0/1
Router(configcontroller)# mode atm aim 0
Router(configcontroller)# framing esf
Router(configcontroller)# linecode b8zs
!
Router(config)# interface ATM0/0
Router(configif)# imagroup 1
!
Router(config)#interface ATM0/1
Router(configif)# imagroup 1
!
Router(config)# interface ATM0/IMA1
Router(configif)# bandwidth 4500
Router(configif)# no ip address
Router(configif)# atm vcpervp 1024
Router(configif)# no atm ilmikeepalive
!
Router(config)# interface ATM0/IMA1.100 pointtopoint
Router(configif)# bandwidth 4500
Router(configif)# ip address 172.19.18.26 255.255.255.252
It can be used as a Voice interface card. In this case, VWIC cards work with the High Density Voice
Network Modules (NMHDV). Note the configuration example in the IP Communications
HighDensity Digital Voice/Fax Network Module.

VWIC21MFTT1/E1, VWIC22MFTT1/E1 Hardware Installation

Once you install the second generation 1 and 2Port T1/E1 Multiflex Trunk Voice/WAN Interface cards, the
hardware information of the module is displayed in the output of the show diag command. The interfaces of
the module do not display in the output of the show runningconfig or show ip interface brief commands.
These modules need extra configuration after their installation. You need to issue the card type {t1 | e1}
command to configure the router in order to recognize the card. Refer to the configuration examples for
SecondGeneration 1 and 2Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards for more information.

LCV and PCV Errors

When you use VWIC2MFT and VWIC1MFT, you can see massive line and path code violation error
messages in the controller interface.

Router# show controllers t1

T1 0/0/0 is up.
Applique type is Channelized T1
Cablelength is long gain36 0db
Description:
No alarms detected.
alarmtrigger is not set
Version info Firmware: 20041023, FPGA: 16, spm_count = 0
Framing is ESF, Line Code is B8ZS, Clock Source is Line.
CRC Threshold is 320. Reported from firmware is 320.
Data in current interval (571 seconds elapsed):
46797 Line Code Violations, 9926 Path Code Violations
 0 Slip Secs, 0 Fr Loss Secs, 228 Line Err Secs, 8 Degraded Mins
136 Errored Secs, 108 Bursty Err Secs, 105 Severely Err Secs, 0 Unavail Secs

These steps can help you resolve the issue:

1. Run the Loopback Test to isolate the issue between the router module and the line.
2. Have the service provider test the line.
3. Verify that your IOS version does not hit the current bug CSCsb00129 (registered customers only) .

Network Modules
NM1T3/E3 Installation Issues (DS3 Card)
By default, the T3 controller does not show up in the show runningconfig output. Use show version or
show diag in order to see the card, which does not show up in the show run or show interfaces output.

Router3745#show version
Cisco Internetwork Operating System Software
IOS (tm) 3700 Software (C3745IK9SM), Version 12.3(12b), RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 19862005 by cisco Systems, Inc.
Compiled Thu 31Mar05 18:07 by jfeldhou
Image textbase: 0x60008AF4, database: 0x61E20000

ROM: System Bootstrap, Version 12.2(8r)T2, RELEASE SOFTWARE (fc1)

ROM: 3700 Software (C3745IK9SM), Version 12.3(12b), RELEASE SOFTWARE (fc2)

DR47459A uptime is 18 minutes

System returned to ROM by reload
System image file is "flash:c3745ik9smz.12312b.bin"

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
thirdparty authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to

export@cisco.com.

cisco 3745 (R7000) processor (revision 0.0) with 249856K/12288K bytes of memory.
Processor board ID
R7000 CPU at 350MHz, Implementation 39, Rev 3.3, 256KB L2, 2048KB L3 Cache
Bridging software.
X.25 software, Version 3.0.0.
SuperLAT software (copyright 1990 by Meridian Technology Corp).
2 FastEthernet/IEEE 802.3 interface(s)
1 Subrate T3/E3 ports(s)
DRAM configuration is 64 bits wide with parity disabled.
151K bytes of nonvolatile configuration memory.
62592K bytes of ATA System CompactFlash (Read/Write)

Configuration register is 0x2102

Router3745#show ip interface brief

 Interface IPAddress OK? Method Status Prot
ocol
FastEthernet0/0 10.10.50.25 YES NVRAM up up

FastEthernet0/1 unassigned YES NVRAM administratively down down

You need to configure the router in order to recognize the card. This configuration example shows you how to
configure the NM1T3/E3 card. Refer to the hardware installation guide Configure the Card Type and
Controller for T3 for detailed configuration information.

Router3745(config)# card type t3 1

Router3745(config)# exit
*Mar 1 00:24:20.031: %LINK3UPDOWN: Interface Serial1/0, changed state to down
*Mar 1 00:24:21.031: %LINEPROTO5UPDOWN: Line protocol on Interface Serial1/0,
changed state to down

Router3745# show ip interface brief

Interface IPAddress OK? Method Status Prot
ocol
FastEthernet0/0 10.10.50.25 YES NVRAM up up

FastEthernet0/1 unassigned YES NVRAM administratively down down

Serial1/0 unassigned YES unset down down

Ethernet Switching Network Modules

Inline Power Issues
The new Cisco EtherSwitch service modules (NME16ES1GP, NMEX23ES1GP,
NMEXD24ES1SP, and NMEXD48ES2SP only) provide both Cisco prestandard and IEEE
802.3af Power over Ethernet (PoE) support when inserted in Cisco 2800 Series or 3800 Series Integrated
Services Routers. (It requires an upgrade to an ACIP power supply.) The 802.3af is the IEEE standard in the
delivery of power to Ethernet ports. After the 802.3af Etherswitch modules have been added, you cannot
configure PoE.

This occurs because the Inline Power Supply is required to provide PoE capabilities in these routers. The
external power supply option cannot be used with the Cisco 2800 or 3800 Series. The internal router power
supply can be swapped out for a new power supply with PoE capabilities if PoE is required. Examples of PoE
enabled power supplies include PWR2811ACIP=, PWR282151ACIP=, PWR3825ACIP=, and
PWR3845ACIP=. For detailed explanations and requirements, read the Cisco EtherSwitch Network
Modules.

The Hardware Installation guide shows how to replace the power supply in the Cisco 2800 and 3800 Series
Routers.

Installing and Upgrading Internal Modules in Cisco 2800 Series Routers Replacing the Power
Supply
Installing a Power Supply in a Cisco 3825 Router
Installing a Power Supply in a Cisco 3845 Router

Troubleshooting Serial Interfaces

This is a list of references to help troubleshoot serial interfaces:

T1 Troubleshooting
 Troubleshooting Serial Line Problems
Loopback Tests for T1/56K Lines

Related Information
Hardware Troubleshooting Index Page
Troubleshooting Bus Error Crashes
Troubleshooting Router Crashes
Troubleshooting Router Hangs
Cisco Interfaces and Modules Product Support
Technical Support & Documentation Cisco Systems

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Updated: Dec 07, 2006 Document ID: 71820