Using and Configuring Features Version 3.4

Configuring and Monitoring VCRM

Virtual Circuit Resource Manager (VCRM) is a feature that supports Resource ReSerVation Protocol (RSVP), which is described in "Using RSVP" and "Configuring and Monitoring RSVP" in the Protocol Configuration and Monitoring Reference Volume 1. Based upon the reservation request from RSVP, VCRM creates the connection for the data flow over the physical interface. To do this, VCRM must first determine whether enough bandwidth exists to accommodate the reservation.

Note:

If you are using WAN interfaces such as frame relay or X.25, you need to set the line speed so that VCRM knows how much bandwidth is available. The procedure for setting the line speed is described in the Frame Relay and X.25 interface configuration and monitoring chapters of the Nways Multiprotocol Access Services Software User's Guide.

If the interface is ATM SVC, VCRM maps RSVP QoS requests to SVC setup requests. The RSVP reservation request succeeds if the SVC setup succeeds. VCRM ensures that there is adequate buffer space for the QoS packets and that these packets are sent over the correct SVC for transmission.

If the interface is not ATM, such as PPP link, LAN, or WAN, VCRM uses software queuing of the QoS and best-effort packets to prioritize the packets on the outbound link.

This chapter includes the following sections:

"Accessing the VCRM Configuration Environment"
"Accessing the VCRM Monitoring Environment"
"VCRM Monitoring Commands"

Accessing the VCRM Configuration Environment

To access the VCRM configuration environment, enter the following command at the Config> prompt:

Config> feature vcrm
VC & Resource Management config console
  --Currently no configurable objects.
Config>

The purpose of the message displayed is to indicate that VCRM cannot be separately configured. Enabling RSVP enables VCRM, which obtains its parameters from the RSVP configuration.

Accessing the VCRM Monitoring Environment

To access the VCRM monitoring environment, type

   * t 5

Then, enter the following command at the + prompt:

   + feature VCRM
   VCRM console
   VCRM Console>

The VCRM Console> prompt appears.

VCRM Monitoring Commands

This section describes the VCRM monitoring commands. Enter these commands at the VCRM Console> prompt.

Table 68. VCRM Monitoring Commands

Command	Function
? (Help)	Displays all the commands available for this command level or lists the options for specific commands (if available). See "Getting Help".
Clear	Resets the queue statistics.
Queue	Shows non-ATM software queuing statistics.
Exit	Returns you to the previous command level. See "Exiting a Lower Level Environment".

Clear

Use the clear command to reset the software queue statistics.

Syntax:

clear

See the queue command for an example of the clear command.

Queue

Use the queue command to show the software queuing of the traffic flows that are not ATM.

Syntax:

queue

The following list defines the terms used in displaying the non-ATM software queues:

Quota: Amount of bandwidth reserved. Originally, best-effort (B.E.) has all the quotas. When a reservation is made, the reserved bandwidth (b/w) is shifted from the B.E. quota to the QoS quota.
Max-q: Maximum queue length, stated in packets.
Curr-q: Current queue length, stated in packets.
In quota: Packets or kilobytes sent within the allocated bandwidth.
Outside quota: Packets or kilobytes sent outside of the allocated bandwidth, when idle bandwidth was available.
Packets/bytes dropped: Packets or bytes dropped by software queueing.
DLC packets/bytes dropped: Packets or bytes dropped by DLC after the packets have gone through the software queue.

Example:

*t 5
 
+feature vcrm
VCRM console
VCRM Console>?
CLEAR
QUEUE
EXIT
VCRM Console>queue
Flow-control Queues at sys-clock 346781 Second:
---------
Intf    B.E. Quota:       10000 Kbps            QoS Quota:        0     Kbps
0/Eth   B.E. Max-q        0                     QoS Max-q         0       
        B.E. curr-q       0                     QoS curr-q        0          
        B.E. pkts/Kbytes sent:                  QoS pkts/Kbytes sent:
        in quota:        54169/   3926          in quota:            0/      0
        outside quota:       0/      0          outside quota:       0/      0
        B.E. pkts/bytes dropped: 0/0            QoS pkts/bytes dropped:  0/0
        DLC pkts/bytes dropped:  B.E.: 0/0      QoS: 0/0
Intf    B.E. Quota:       2048  Kbps            QoS Quota:        0     Kbps
2/PPP   B.E. Max-q        0                     QoS Max-q         0       
        B.E. curr-q       0                     QoS curr-q        0          
        B.E. pkts/Kbytes sent:                  QoS pkts/Kbytes sent:
        in quota:           62/      6          in quota:            0/      0
        outside quota:       0/      0          outside quota:       0/      0
        B.E. pkts/bytes dropped: 0/0            QoS pkts/bytes dropped:  0/0
        DLC pkts/bytes dropped:  B.E.: 0/0      QoS: 0/0
Intf    B.E. Quota:       2032  Kbps            QoS Quota:        16    Kbps
3/FR    B.E. Max-q        1                     QoS Max-q         1       
        B.E. curr-q       0                     QoS curr-q        0          
        B.E. pkts/Kbytes sent:                  QoS pkts/Kbytes sent:
        in quota:        53160/   4920          in quota:       346596/  31886
        outside quota:       0/      0          outside quota:       0/      0
        B.E. pkts/bytes dropped: 0/0            QoS pkts/bytes dropped:  0/0
        DLC pkts/bytes dropped:  B.E.: 0/0      QoS: 0/0
Intf    B.E. Quota:       2048  Kbps            QoS Quota:        0     Kbps
4/PPP   B.E. Max-q        1                     QoS Max-q         1       
        B.E. curr-q       0                     QoS curr-q        0          
        B.E. pkts/Kbytes sent:                  QoS pkts/Kbytes sent:
        in quota:           66/      6          in quota:          109/     1
        outside quota:       0/      0          outside quota:       0/      
        B.E. pkts/bytes dropped: 0/0            QoS pkts/bytes dropped:  0/0
        DLC pkts/bytes dropped:  B.E.: 0/0      QoS: 0/0
 
Max total queue length=1;  current total length=0
VCRM Console>clear
Flow-control Queues cleared at sys-clock 346786 Second:
-------
VCRM Console>

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