Command:

show frame-relay pvc

Mode:

Router#


Syntax:

show frame-relay pvc [type number [dlci]]


Syntax Description:

type

(Optional) Interface type

number

(Optional) Interface number

dlci

(Optional) This represents one of the specific DLCI numbers used on the interface. Statistics for the specified PVC display when a DLCI is also specified.

 

Command Description:

To display statistics about PVCs for Frame Relay interfaces, use the show frame-relay pvc EXEC command.

Statistics Reporting

To obtain statistics about PVCs on all Frame Relay interfaces, use this command with no arguments.

Per VC counters are not incremented at all when either autonomous or SSE switching is configured. Therefore, PVC values will be inaccurate if either switching method is used.

DCE, DTE, and Logical Interfaces

When the interface is configured as a DCE and the DLCI usage is SWITCHED, the value displayed in the PVC STATUS field is determined by the status of outgoing interfaces (up or down) and the status of the outgoing PVC. The status of the outgoing PVC is updated in the Local Management Interface (LMI) message exchange. PVCs terminated on a DCE interface use the status of the interface to set the PVC STATUS.

In the case of a hybrid DTE switch, the PVC status on the DTE side is determined by the PVC status reported by the external Frame Relay network through the LMI.

If the outgoing interface is a tunnel, the PVC status is determined by what is learned from the tunnel.

Traffic Shaping

Congestion control mechanisms are currently not supported, but the switch passes forward explicit congestion notification (FECN) bits, backward explicit congestion notification (BECN) bits, and discard eligibility (DE) bits unchanged from entry to exit points in the network.

If an LMI status report indicates that a PVC is not active, then it is marked as inactive. A PVC is marked as deleted if it is not listed in a periodic LMI status message.


Example:

The following is a sample of output from the show frame-relay pvc command:

Router#show frame-relay pvc
    PVC Statistics for interface Serial (Frame Relay DCE)

DLCI = 22, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial3/1:1.1

input pkts 9   output pkts 300008   in bytes 2754
out bytes 161802283   dropped pkts 0   in FECN pkts 0
in BECN pkts 1   out FECN pkts 0   out BECN pkts 0
in DE pkts 0   out DE pkts 0
outbcast pkts 0   outbcast bytes 0
Shaping adapts to ForeSight   in ForeSight signals 1304
pvc create time 1d05h, last time pvc status changed 00:11:00
 

If the circuit is configured for shaping to adapt to BECN, it is indicated in the display:

  Shaping adapts to BECN
 

If traffic shaping on the circuit does not adapt to either BECN or ForeSight, nothing extra shows:

DLCI = 100, DLCI USAGE = SWITCHED, PVC STATUS = ACTIVE

input pkts 0   output pkts 0   in bytes 0
out bytes 0   dropped pkts 0   in FECN pkts 0
in BECN pkts 0   out FECN pkts 0   out BECN pkts 0
in DE pkts 0   out DE pkts 0
outbcast pkts 0   outbcast bytes 0
pvc create time 0:03:03 last time pvc status changed 0:03:03
Num Pkts Switched 0
 

The following is a sample of output from the show frame-relay pvc command for multipoint subinterfaces. The output displays both the subinterface number and the DLCI. This display is the same whether the PVC is configured for static or dynamic addressing:

DLCI = 300, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0.103

input pkts 10   output pkts 7   in bytes 6222
out bytes 6034   dropped pkts 0   in FECN pkts 0
in BECN pkts 0   out FECN pkts 0   out BECN pkts 0
in DE pkts 0   out DE pkts 0
outbcast pkts 0   outbcast bytes 0
pvc create time 0:13:11  last time pvc status changed 0:11:46

DLCI = 400, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0.104

input pkts 20   output pkts 8   in bytes 5624
out bytes 5222   dropped pkts 0   in FECN pkts 0
in BECN pkts 0   out FECN pkts 0   out BECN pkts 0
in DE pkts 0   out DE pkts 0
outbcast pkts 0   outbcast bytes 0
pvc create time 0:03:57  last time pvc status changed 0:03:48
 
The following table describes the additional fields shown in the display when traffic shaping is in effect:

Table: show frame-relay pvc
Field Descriptions

Field Description

DLCI

One of the data link connection identifier (DLCI) numbers for the PVC

DLCI USAGE

One of the following values:

  •  

  • SWITCHED�the router or access server is used as a switch
  • LOCAL�the router or access server is used as a DTE
  • UNUSED�the DLCI is not referenced by any user-entered configuration commands on the router

     

PVC STATUS

Status of the PVC: ACTIVE, INACTIVE, or DELETED

INTERFACE = Serial0.103

Specific subinterface associated with this DLCI

input pkts

Number of packets received on this PVC

output pkts

Number of packets sent on this PVC

in bytes

Number of bytes received

out bytes

Number of bytes sent

dropped pkts

Number of packets dropped by the router at Frame Relay level because an active outbound DLCI was not found

in FECN pkts

Number of packets received with the FECN bit set

in BECN pkts

Number of packets received with the BECN bit set

out FECN pkts

Number of packets sent with the FECN bit set

out BECN pkts

Number of packets sent with the BECN bit set

in DE pkts

Number of DE packets received

out DE pkts

Number of DE packets sent

outbcast pkts

Number of output broadcast packets

outbcast bytes

Number of output broadcast bytes

pvc create time

Time the PVC was created

last time pvc status changed

Time the PVC changed status (active to inactive)

Num Pkts Switched

Number of packets switched within the router or access server, this PVC is the source PVC

The following is a sample of output from the show frame-relay pvc command with no traffic shaping configured on the interface:

Router#show frame-relay pvc


PVC Statistics for interface Serial1 (Frame Relay DTE)

DLCI = 100, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial1

  input pkts 0             output pkts 0            in bytes 0
  out bytes 0              dropped pkts 0           in FECN pkts 0
  in BECN pkts 0           out FECN pkts 0          out BECN pkts 0
  in DE pkts 0             out DE pkts 0
  out bcast pkts 0          out bcast bytes 0

The following is a sample of output from the show frame-relay pvc command when traffic shaping is in effect:

Router#show frame-relay pvc


PVC Statistics for interface Serial1 (Frame Relay DTE)

DLCI = 101, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial1
input pkts 14046    output pkts 4339    in bytes 960362
  out bytes 675566    dropped pkts 0           in FECN pkts 0
  in BECN pkts 148    out FECN pkts 0          out BECN pkts 0
  in DE pkts 44       out DE pkts 0
  out bcast pkts 4034          out bcast bytes 427346

pvc create time 11:59:29, last time pvc status changed 11:59:29
CIR 64000         BC 8000         BE 1600     limit 2000      interval 125
mincir 32000      byte incremen 500           BECN response yes
pkts 9776         bytes 838676     pkts delayed 0         bytes delayed 0
shaping inactive

List   Queue  Args
1      4      byte-count 100
  Output queues: (queue #: size/max/drops)
     0: 0/20/0 1: 0/20/0 2: 0/20/0 3: 0/20/0 4: 0/20/0
     5: 0/20/0 6: 0/20/0 7: 0/20/0 8: 0/20/0 9: 0/20/0
     10: 0/20/0 11: 0/20/0 12: 0/20/0 13: 0/20/0 14: 0/20/0
     15: 0/20/0 16: 0/20/0
 

Table: show frame-relay pvc
Field Descriptions with Traffic Shaping in Effect

Field Description

CIR

Current committed information rate (CIR), in bits per second

BC

Current committed burst size, in bits

BE

Current excess burst size, in bits

limit

Maximum number of bytes transmitted per internal interval (excess plus
sustained)

interval

Interval being used internally interval being used internally (may be smaller than the interval derived from Bc/CIR, this happens when the router determines that traffic flow will be more stable with a smaller configured interval)

mincir

Minimum committed information rate (CIR) for the PVC

incremen

Number of bytes that will be sustained per internal interval

BECN response

Frame Relay has BECN Adaptation configured

List Queue Args

Identifier and parameter values for a custom queue list defined for the PVC (These identifiers and values correspond to the command queue-list 1
queue 4 byte-count 100
)

Output queues

Output queues used for the PVC, with the current size, the maximum size, and the number of dropped frames shown for each queue

The packet and byte values are counts for the number of packets and bytes that have gone through the traffic shaping system.

 


Misconceptions:
None

Related commands:
None

� Cisco Systems, Inc. 2001, 2002, 2003
World Wide Education

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