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Table Of Contents
Configuring Subnetwork Bandwidth Manager
Subnetwork Bandwidth Manager Configuration Task List
Configuring an Interface as a Designated SBM Candidate
Configuring the NonResvSendLimit Object
Verifying Configuration of SBM State
Subnetwork Bandwidth Manager Candidate Configuration Example
Configuring Subnetwork Bandwidth Manager
This chapter describes the tasks for configuring the Subnetwork Bandwidth Manager (SBM) feature, which is a signalling feature that enables Resource Reservation Protocol (RSVP)-based admission control over IEEE 802-styled networks.
For complete conceptual information, see the section "Subnetwork Bandwidth Manager" in the chapter "Signalling Overview" in this book.
For a complete description of the SBM commands in this chapter, refer to the Cisco IOS Quality of Service Solutions Command Reference. To locate documentation of other commands that appear in this chapter, use the command reference master index or search online.
To identify the hardware platform or software image information associated with a feature, use the Feature Navigator on Cisco.com to search for information about the feature or refer to the software release notes for a specific release. For more information, see the "Identifying Supported Platforms" section in the "Using Cisco IOS Software" chapter in this book.
Subnetwork Bandwidth Manager Configuration Task List
To configure SBM, perform the tasks described in the following sections. The task in the first section is required; the tasks in the remaining sections are optional.
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Configuring an Interface as a Designated SBM Candidate (Required)
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See the end of this chapter for the section "Subnetwork Bandwidth Manager Candidate Configuration Example."
Configuring an Interface as a Designated SBM Candidate
SBM is used in conjunction with RSVP. Therefore, before you configure an interface as a Designated SBM (DSBM) contender, ensure that RSVP is enabled on that interface.
To configure the interface as a DSBM candidate, use the following command in interface configuration mode:
Configuring the NonResvSendLimit Object
The NonResvSendLimit object specifies how much traffic can be sent onto a managed segment without a valid RSVP reservation.
To configure the NonResvSendLimit object parameters, use the following commands in interface configuration mode, as needed:
To configure the per-flow limit on the amount of traffic that can be sent without a valid RSVP reservation, configure the rate, burst, peak, min-unit, and max-unit keywords for finite values from 0 to infinity.
To allow all traffic to be sent without a valid RSVP reservation, configure the rate, burst, peak, min-unit, and max-unit keywords for unlimited. To configure the parameters for unlimited, you can either omit the command or enter the no version of the command (for example, no ip rsvp dsbm non-resv-send-limit rate). Unlimited is the default value.
The absence of the NonResvSendLimit object allows any amount of traffic to be sent without a valid RSVP reservation.
Verifying Configuration of SBM State
To display information that enables you to determine if an interface has been configured as a DSBM candidate and which of the contenders has been elected the DSBM, use the following command in EXEC mode:
The displayed output from the show ip rsvp sbm command identifies the interface by name and IP address, and it shows whether the interface has been configured as a DSBM contender. If the interface is a contender, the DSBM Priority field displays its priority. The DSBM election process is dynamic, addressing any new contenders configured as participants. Consequently, at any given time, an incumbent DSBM might be replaced by one configured with a higher priority. The following example shows sample output from the show ip rsvp sbm command:
Router# show ip rsvp sbmInterface DSBM Addr DSBM Priority DSBM Candidate My PriorityEt1 1.1.1.1 70 yes 70Et2 145.2.2.150 100 yes 100If you use the detail keyword, the output is shown in a different format. In the left column, the local DSBM candidate configuration is shown; in the right column, the corresponding information for the current DSBM is shown. In the following example, the local DSBM candidate won election and is the current DSBM:
Router# show ip rsvp sbm detailInterface:Ethernet2Local Configuration Current DSBMIP Address:10.2.2.150 IP Address:10.2.2.150DSBM candidate:yes I Am DSBM:yesPriority:100 Priority:100Non Resv Send Limit Non Resv Send LimitRate:500 Kbytes/sec Rate:500 Kbytes/secBurst:1000 Kbytes Burst:1000 KbytesPeak:500 Kbytes/sec Peak:500 Kbytes/secMin Unit:unlimited Min Unit:unlimitedMax Unit:unlimited Max Unit:unlimitedSubnetwork Bandwidth Manager Candidate Configuration Example
For information about configuring SBM, see the section "Subnetwork Bandwidth Manager Configuration Task List" in this chapter.
In the following example, RSVP and SBM are enabled on Ethernet interface 2. After RSVP is enabled, the interface is configured as a DSBM and SBM candidate with a priority of 100. The configured priority is high, making this interface a good contender for DSBM status. However, the maximum configurable priority value is 128, so another interface configured with a higher priority could win the election and become the DSBM.
interface Ethernet2ip address 145.2.2.150 255.255.255.0no ip directed-broadcastip pim sparse-dense-modeno ip mroute-cachemedia-type 10BaseTip rsvp bandwidth 7500 7500ip rsvp dsbm candidate 100ip rsvp dsbm non-resv-send-limit rate 500ip rsvp dsbm non-resv-send-limit burst 1000ip rsvp dsbm non-resv-send-limit peak 500end