Troubleshooting Switch Router ATM Network Connections

This chapter describes troubleshooting information about connectivity and performance problems in ATM switching network connections, and contains the following sections:

Checking Network Connections

Before you begin, make sure that all physical port connections are working correctly. See "Troubleshooting Switch Router ATM Interface Connections." Confirm the following:

Proper cable insertion. Be sure that transmit and receive cable pairs match.
Proper cable types. Connector fit does not ensure that the cables are the proper types or are cross-connected correctly.
Reliable cables.
No-shutdown mode on all interfaces on both ends of the cable.
Proper interface configuration (for example, framing and line coding).
Proper interface types on both ends of the cable.

Troubleshooting PVP and PVC Connections

This section describes how to troubleshoot permanent virtual paths (PVPs) and permanent virtual channels (PVCs). PVP and PVC connections are used primarily between buildings as the backbone connection and between frequently accessed hosts, such as the Domain Name System (DNS) server.

In the example network in Figure 6-1, the primary PVC configured as the backbone connection between the switch router on Floor 1 in the administration building and the switch router on Floor 1 in the manufacturing building has the following virtual path identifier (VPI) and virtual channel identifier (VCI) numbers:

AdminFl1Ls1, ATM interface 3/1/0, VPI 50, and VCI 100
ManuFl1Ls1, ATM interface 0/1/0, VPI 75, and VCI 150

Figure 6-1 PVC VPI and VCI Test in the Example Network

This section contains the following procedures:

For detailed configuration information, refer to the "Configuring Virtual Connections" chapter in the ATM Switch Router Software Configuration Guide. For detailed information about configuring PVCs and traffic shaping on the Catalyst 5000 and 6000 ATM modules, refer to the ATM Configuration Guide and Command Reference: Catalyst 5000 and 6000 ATM Modules.

Checking the PVC Interface Status

Use the following command to confirm that the configured PVC interface status is up:

Command	Purpose
show atm status	Confirms the interface status.

Follow these steps to check the interface status:

Step 1 Use the show atm status command to check the status of the interface PVP.

 
Switch# show atm status

 
NUMBER OF INSTALLED CONNECTIONS: (P2P=Point to Point, P2MP=Point to MultiPoint)

 
Type     PVCs SoftPVCs     SVCs     TVCs     PVPs SoftPVPs     SVPs      Total

 
P2P        26        0        1        0        0        0        0         27

 
P2MP        0        0        0        0        0        0        0          0

 
                                      TOTAL INSTALLED CONNECTIONS =         27

 
PER-INTERFACE STATUS SUMMARY AT 16:02:57 UTC Mon May 11 1998:

 
   Interface      IF         Admin  Auto-Cfg    ILMI Addr     SSCOP    Hello

 
     Name       Status      Status    Status    Reg State     State    State

 
------------- -------- ------------ -------- ------------ --------- --------

 
ATM10/0/0           UP           up     done  UpAndNormal    Active  LoopErr

 
ATM10/0/1           UP           up     done  UpAndNormal    Active      n/a

 
ATM10/0/2         DOWN         down  waiting          n/a      Idle      n/a

 
ATM10/0/3           UP           up     done  UpAndNormal    Active  LoopErr

 
  
ATM10/0/3.80        UP           up     done  UpAndNormal    Active  LoopErr

 
ATM10/1/0         DOWN         down  waiting          n/a      Idle      n/a

 
ATM10/1/1           UP           up     done  UpAndNormal    Active      n/a

 
ATM10/1/2           UP           up     done  UpAndNormal    Active  LoopErr

 
ATM10/1/3           UP           up     done  UpAndNormal    Active  LoopErr

 
  
ATM10/1/3.80        UP           up     done  UpAndNormal    Active  LoopErr

 
ATM13/0/0           UP           up      n/a  UpAndNormal      Idle      n/a

 
Switch# 

Step 2 Check the IF (Interface) Status field to confirm that the interface is up. If it is not, see "Troubleshooting Switch Router ATM Interface Connections."

Step 3 Check the Admin (Administration) Status field to confirm that the interface is up. If it is not, see "Troubleshooting Switch Router ATM Interface Connections."

Checking the VPI and VCI Numbers

Use the following command to confirm the configured PVC interface VPI and VCI numbers:

Command	Purpose
show atm vc interface atm card/subcard/port vpi vci	Confirms the interface status.

Follow these steps to check the VPI and VCI numbers configured for the PVC connection:

Step 1 Use the show atm vc interface atm command to confirm the numbers at both ends of the connection between the administration building and the manufacturing building:

 
AdminFl1Ls1# show atm vc interface atm 3/1/0 50 100

 
Interface: ATM3/1/0, Type: oc12suni

 
  
VPI = 50 VCI = 100

 
Status: UP

 
Time-since-last-status-change: 5w1d

 
Connection-type: PVC

 
Cast-type: point-to-point

 
Packet-discard-option: disabled

 
Usage-Parameter-Control (UPC): pass

 
Wrr weight: 32

 
Number of OAM-configured connections: 0

 
OAM-configuration: disabled

 
OAM-states:  Not-applicable

 
  
Cross-connect-interface: ATM0/1/0, Type: oc12suni

 
  
Cross-connect-VPI = 75

 
  
Cross-connect-VCI = 150

 
Cross-connect-UPC: pass

 
Cross-connect OAM-configuration: disabled

 
Cross-connect OAM-state:  Not-applicable

 
Threshold Group: 5, Cells queued: 0

 
Rx cells: 0, Tx cells: 0

 
Tx Clp0:0,  Tx Clp1: 0

 
Rx Clp0:0,  Rx Clp1: 0

 
Rx Upc Violations:0, Rx cell drops:0

 
Rx Clp0 q full drops:0, Rx Clp1 qthresh drops:0

 
Rx connection-traffic-table-index: 1

 
Rx service-category: UBR (Unspecified Bit Rate)

 
Rx pcr-clp01: 7113539

 
Rx scr-clp01: none

 
Rx mcr-clp01: none

 
Rx      cdvt: 1024 (from default for interface)

 
Rx       mbs: none

 
Tx connection-traffic-table-index: 1

 
Tx service-category: UBR (Unspecified Bit Rate)

 
Tx pcr-clp01: 7113539

 
Tx scr-clp01: none

 
Tx mcr-clp01: none

 
Tx      cdvt: none

 
Tx       mbs: none

 
AdminFl1Ls1# 

Step 2 Check the VPI and VCI fields. They show the VPI and VCI of the PVC connection at the administration building.

Step 3 Check the Cross-connect-interface and Cross-connect-VPI and Cross-connect-VCI fields. They indicate the VPI and VCI of the PVC connection at the manufacturing building.

Checking the VPI and VCI Ranges

Use the following commands to check the VPI and VCI ranges of the PVC connection:

Command	Purpose
show atm ilmi-status atm card/subcard/port	Confirms the range configuration of the PVC and its VPI and VCI numbers.

Follow these steps to check the VPI and VCI ranges of the PVC connection at the administration building:

Step 1 Use the show atm ilmi-status atm command to confirm the ranges of the connection at the administration building.

 
AdminFl1Ls1# show atm ilmi-status atm 3/1/0

 
Interface : ATM3/1/0 Interface Type : Private NNI

 
ILMI VCC : (50, 100) ILMI Keepalive : Disabled

 
ILMI State:       UpAndNormal

 
Peer IP Addr:     172.20.41.93    Peer IF Name:     ATM0/1/1

 
Peer MaxVPIbits:  8               Peer MaxVCIbits:  14

 
  
Peer MaxVPCs:     255             Peer MaxVCCs:     16383

 
Peer MaxSvccVpi:  255             Peer MinSvccVci:  33

 
Peer MaxSvpcVpi:  255

 
Configured Prefix(s) :

 
47.0091.8100.0000.0040.0b0a.2a81

 
AdminFl1Ls1#

Step 2 Check the Peer MaxVPCs and Peer MaxVCCs fields. They indicate the VPI and VCI ranges of the PVC connection at the manufacturing building.

Step 3 Use the show atm ilmi-status atm command to confirm VPI and VCI ranges of the PVC connection at the manufacturing building.

 
ManuFl1Ls1# show atm ilmi-status atm 0/1/0

 
Interface : ATM0/1/0 Interface Type : Private NNI

 
ILMI VCC : (75, 150) ILMI Keepalive : Disabled

 
ILMI State:       UpAndNormal

 
Peer IP Addr:     172.20.41.93    Peer IF Name:     ATM0/1/0

 
Peer MaxVPIbits:  8               Peer MaxVCIbits:  14

 
  
Peer MaxVPCs:     255             Peer MaxVCCs:     16383

 
Peer MaxSvccVpi:  255             Peer MinSvccVci:  33

 
Peer MaxSvpcVpi:  255

 
Configured Prefix(s) :

 
47.0091.8100.0000.0040.0b0a.2a81

 
ManuFl1Ls1#

Step 4 Check the Peer MaxVPCs and Peer MaxVCCs fields. They indicate the VPI and VCI ranges of the PVC connection at the administration building.

Step 5 If either the VPI or VCI of the PVC are configured incorrectly, refer to Chapter 6, "Configuring Virtual Connections," of the ATM Switch Router Software Configuration Guide .

Checking the UBR Resources

Use the following commands to confirm unspecified bit rate (UBR) for the PVP and PVC best-effort connection limit configuration:

Command	Purpose
show atm interface resource atm card/subcard/port	For UBR connections, confirms connection admission control (CAC) best-effort limit configuration.
show atm resource	For VBR and CBR connections, confirms that the resources requested are available.

Follow these steps to confirm UBR for the PVC and PVP best-effort connection limit configuration on the interface.

Step 1 Use the show atm interface resource atm card/subcard/port command to confirm the maximum number best-effort connection limit configuration number.

 
Switch# show atm interface resource atm 10/0/0

 
Resource Management configuration:

 
    Output queues:

 
        Max sizes(explicit cfg): none cbr, none vbr-rt, none vbr-nrt, none abr-ubr

 
        Max sizes(installed): 256 cbr, 256 vbr-rt, 4096 vbr-nrt, 12032 abr-ubr

 
        Efci threshold: 25% cbr, 25% vbr-rt, 25% vbr-nrt, 25% abr, 25% ubr

 
        Discard threshold: 87% cbr, 87% vbr-rt, 87% vbr-nrt, 87% abr, 87% ubr

 
        Abr-relative-rate threshold: 25% abr

 
    Pacing: disabled   0 Kbps rate configured, 0 Kbps rate installed

 
    Service Categories supported: cbr,vbr-rt,vbr-nrt,abr,ubr

 
    Link Distance: 0 kilometers

 
    Controlled Link sharing:

 
        Max aggregate guaranteed services: none RX,  none TX

 
        Max bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX,

 
                       none abr RX, none abr TX, none ubr RX, none ubr TX

 
        Min bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX,

 
                       none abr RX, none abr TX, none ubr RX, none ubr TX

 
  
    Best effort connection limit: 10 max connections

 
    Max traffic parameters by service (rate in Kbps, tolerance in cell-times):

 
        Peak-cell-rate RX: none cbr, none vbr, none abr, none ubr

 
        Peak-cell-rate TX: none cbr, none vbr, none abr, none ubr

 
        Sustained-cell-rate: none vbr RX, none vbr TX

 
        Minimum-cell-rate RX: none abr, none ubr

 
        Minimum-cell-rate TX: none abr, none ubr

 
        CDVT RX: none cbr, none vbr, none abr, none ubr

 
        CDVT TX: none cbr, none vbr, none abr, none ubr

 
        MBS: none vbr RX, none vbr TX

 
Resource Management state:

 
    Cell-counts: 0 cbr, 0 vbr-rt, 0 vbr-nrt, 0 abr-ubr

 
    Available bit rates (in Kbps):

 
        147743 cbr RX, 147743 cbr TX, 147743 vbr RX, 147743 vbr TX,

 
        0 abr RX, 0 abr TX, 0 ubr RX, 0 ubr TX

 
    Allocated bit rates:

 
        0 cbr RX, 0 cbr TX, 0 vbr RX, 0 vbr TX,

 
 0 abr RX, 0 abr TX, 0 ubr RX, 0 ubr TX

 
  
    Best effort connections: 1 pvcs,  0 svcs

 
Switch# 

Step 2 Check the Best effort connection limit field max (maximum) connections number. If the number is too low, increase it using the atm cac best-effort-limit interface command.

Step 3 Check the Best effort connection field to determine the number of established connections. If no connections are available, the connection fails.

To modify the best-effort connection limit, refer to the "Configuring Resource Management" chapter in the ATM Switch Router Software Configuration Guide .

Checking the VBR and CBR Resources

Use the following commands to confirm the VBR and CBR resources of the configured PVP:

Command	Purpose
show atm interface resource atm card/subcard/port	For UBR connections, confirms CAC best-effort-limit configuration.
show atm resource	For VBR and CBR connections, confirms that the resources requested are available.

The Catalyst 5000 and 6000 ATM modules do not support the show atm interface resource atm command. To check the status of a virtual connection on a Catalyst 5000 or 6000 ATM module, use the show atm vc command. For detailed information about configuring traffic shaping on the Catalyst 5000 and 6000 ATM modules, refer to the ATM Configuration Guide and Command Reference: Catalyst 5000 and 6000 ATM Modules.

The following example shows the status for all configured VCs on a Catalyst 5000 or 6000 ATM module:

 
ATM-5500# show atm vc

 
                                     AAL /         Peak   Avg.  Burst

 
Interface     VCD   VPI   VCI Type  Encapsulation  Kbps   Kbps  Cells Status

 
0.1             1     0     1  PVC  AAL5-SNAP     155000 100000     0 ACTIVE

 
0               2     0    16  PVC  AAL5-ILMI          0      0     0 ACTIVE

 
ATM-5500#

The following example shows how to display the status for a specific VCD on a Catalyst 5000 or 6000 ATM module:

 
ATM-5500# show atm vc 1

 
ATM0.1: VCD: 1, VPI: 0, VCI: 1, etype:0x0, AAL5 - LLC/SNAP, Flags: 0x830

 
PeakRate: 155000, Average Rate: 100000, Burst Cells: 0, VCmode: 0x0

 
OAM frequency: 60 second(s), InARP DISABLED

 
InPkts: 20972, OutPkts: 6924, InBytes: 6778670, OutBytes: 6210607

 
InPRoc: 20972, OutPRoc: 0, Broadcasts: 0

 
InFast: 0, OutFast: 0, InAS: 0, OutAS: 0

 
OAM F5 cells sent: 6924, OAM cells received: 0

ATM-5500#

Debugging the PVC Connection Management

Use the following commands to debug the PVC connection management:

Command	Purpose
debug atm conn errors	Enables connection management error debugging.
debug atm conn events	Enables connection management event debugging.
no debug all	Disables all debugging.

Troubleshooting Soft PVC Connections

This section describes how to troubleshoot a soft PVC configuration. Soft PVCs are used primarily to connect hosts that do not support signalling and cannot use SVCs.

In the example network in Figure 6-2, the connection between the switch router on Floor 1 in the administration building and the e-mail server has the following VPI and VCI numbers and ATM address:

AdminFl1Ls1, ATM interface 4/0/0, VPI 150, and VCI 250
E-mail server, ATM interface VPI 100, VCI 200, with an ATM address 11.1111.1111.00.1111.1111.1111.1111.1111.1111.00

Figure 6-2 Soft PVC Test in the Example Network

This section contains the following procedures:

For detailed information, refer to the "Configuring Virtual Connections" chapter in the
ATM Switch Router Software Configuration Guide .

Checking the Interface Status

Use the following command to check soft PVC connection interface status:

Command	Purpose
show atm status	Confirms the interface status is up.

Follow these steps to confirm the soft PVC interface is up:

Step 1 Use the show atm status command to check the interface status.

 
Switch# show atm status

 
NUMBER OF INSTALLED CONNECTIONS: (P2P=Point to Point, P2MP=Point to MultiPoint)

 
Type     PVCs SoftPVCs     SVCs     TVCs     PVPs SoftPVPs     SVPs      Total

 
P2P        17        0        0        0        0        0        0         17

 
P2MP        0        0        0        0        0        0        0          0

 
                                      TOTAL INSTALLED CONNECTIONS =         17

 
PER-INTERFACE STATUS SUMMARY AT 13:41:00 UTC Tue May 12 1998:

 
   Interface      IF         Admin  Auto-Cfg    ILMI Addr     SSCOP    Hello

 
     Name       Status      Status    Status    Reg State     State    State

 
------------- -------- ------------ -------- ------------ --------- --------

 
ATM-P0/0/3          UP           up  waiting          n/a      none      n/a

 
ATM0/1/0          DOWN         down  waiting          n/a      Idle      n/a

 
ATM0/1/1          DOWN         down  waiting          n/a      Idle      n/a

 
ATM0/1/2          DOWN         down  waiting          n/a      Idle      n/a

 
ATM0/1/3          DOWN         down  waiting          n/a      Idle      n/a

 
ATM1/0/0            UP           up      n/a  UpAndNormal    Active      n/a

 
ATM1/0/0.80         UP           up  waiting  WaitDevType      Idle      n/a

 
ATM1/0/1          DOWN         down  waiting          n/a      Idle      n/a

 
ATM1/0/2          DOWN         down  waiting          n/a      Idle      n/a

 
ATM1/0/3            UP           up     done  UpAndNormal    Active      n/a

 
ATM1/1/0            UP           up      n/a  UpAndNormal    Active      n/a

 
ATM1/1/1          DOWN         down  waiting          n/a      Idle      n/a

 
ATM1/1/2          DOWN         down  waiting          n/a      Idle      n/a

 
ATM1/1/3            UP           up     done  UpAndNormal    Active      n/a

 
  
ATM1/1/3.80         UP           up  waiting  WaitDevType      Idle      n/a

 
ATM2/0/0            UP           up      n/a  UpAndNormal      Idle      n/a

 
ATM4/1/0          DOWN         down  waiting          n/a      Idle      n/a

 
ATM4/1/1          DOWN         down  waiting          n/a      Idle      n/a

 
ATM4/1/2          DOWN         down  waiting          n/a      Idle      n/a

 
ATM4/1/3          DOWN         down  waiting          n/a      Idle      n/a

 
Switch#

Step 2 Confirm that the IF Status field corresponding to the soft PVC interface is up. If it is down, see "Troubleshooting Switch Router ATM Interface Connections."

Step 3 Confirm that the Admin Status field is up. If it is down, see "Troubleshooting Switch Router ATM Interface Connections."

Step 4 If both fields are up, continue with the following troubleshooting sections.

Checking the VPI Number, VCI Number, and ATM Address

Use the following command to confirm the VPI, VCI, and ATM address of the configured soft PVC:

Command	Purpose
show atm vc interface atm card/subcard/port	Confirms the configuration of VPI, VCI, and ATM address numbers of a soft PVC.

Follow these steps to confirm the VPI, VCI, and ATM address of the configured soft PVC:

Step 1 Use the show atm vc interface atm command to confirm the numbers at both ends of the connection between the administration building switch router and the e-mail server that does not support signalling:

 
AdminFl1Ls1# show atm vc interface atm 4/0/0 150 250

 
Interface: ATM4/0/0, Type: oc3suni

 
  
VPI = 150 VCI = 250

 
Status: NOT CONNECTED

 
Time-since-last-status-change: 00:00:45

 
Connection-type: SoftVC

 
Cast-type: point-to-point

 
Soft vc location: Source

 
  
Remote ATM address: 11.1111.1111.00.1111.1111.1111.1111.1111.1111.00

 
  
Remote VPI: 100

 
  
Remote VCI: 200

 
  
Soft vc call state: Active

 
  
Number of soft vc re-try attempts: 4

 
Slow-retry-interval: 60 seconds

 
Next retry in: 29 seconds

 
Aggregate admin weight: 0

 
Packet-discard-option: disabled

 
Usage-Parameter-Control (UPC): pass

 
Wrr weight: 32

 
Number of OAM-configured connections: 0

 
OAM-configuration: disabled

 
OAM-states:  Not-applicable

 
Threshold Group: 5, Cells queued: 0

 
Rx cells: 0, Tx cells: 0

 
Tx Clp0:0,  Tx Clp1: 0

 
Rx Clp0:0,  Rx Clp1: 0

 
Rx Upc Violations:0, Rx cell drops:0

 
Rx Clp0 q full drops:0, Rx Clp1 qthresh drops:0

 
Rx connection-traffic-table-index: 1

 
Rx service-category: UBR (Unspecified Bit Rate)

 
Rx pcr-clp01: 7113539

 
Rx scr-clp01: none

 
Rx mcr-clp01: none

 
Rx tolerance: 1024 (from default for interface)

 
Tx connection-traffic-table-index: 1

 
Tx service-category: UBR (Unspecified Bit Rate)

 
Tx pcr-clp01: 7113539

 
Tx scr-clp01: none

 
Tx mcr-clp01: none

 
Tx tolerance: none

 
AdminFl1Ls1#

Step 2 Check the Remote ATM address. This address should match the ATM address at the other end of the soft PVC connection.

Step 3 Check the VPI and VCI fields. They indicate the VPI and VCI configuration of this interface.

Step 4 Check the Remote VPI and Remote VCI fields. They indicate the VPI and VCI configuration of the interface in the e-mail server.

If you determine that the VPI and VCI configurations are incorrect, refer to the "Configuring Virtual Connections," of the ATM Switch Router Software Configuration Guide .

Step 5 Check the Soft vc call state field. This field should be Active.

Step 6 Check the Number of soft vc re-try attempts field. The number should be 0.

Checking the Connection Management

Use the following command to check soft PVC connection management:

Command	Purpose
show atm interface atm card/subcard/port	Confirms the interface status and configuration.

Debugging the Connection Management

Use the following commands to debug the PVC connection management:

Command	Purpose
debug atm conn errors	Enables connection management error debugging.
debug atm co

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