- VISM Overview
- MPLS Overview
- RPM Overview
- VISM Voice Features
- Voice Connections
- Voice Over AAL2 Network
- VoIP Network
- Voice Over ATM Services on the VISM
- Digital Signal Processors
- VISM Clocking
- Commands for Adding, Configuring, and Displaying Voice Connections
- Commands for Verifying Voice Connections
- Introduction to Multiprotocol Label Switching
- The Problem of Persistent Loops Due to Protocol Conflicts
- Cisco WAN Switches with MPLS Support
- Setting Up MPLS on the MGX Switch
- MPLS and Virtual Private Networks Using the Route Processor Module
- RPM Memory Locations
- RPM Port Numbering
- Cisco IOS Command-Line Interface
- Commands for Configuring the RPM
- Commands for Setting Up the RPM ATM Switch Interface
- How to Set Up the RPM
- Configuring Subinterfaces
- PVCs on the RPM
- Commands for Configuring Subinterfaces
- Commands for Creating and Displaying PVCs on the RPM
- Creating Connections on the RPM
Commands for Adding, Configuring, and Displaying Voice Connections
This section describes the commands you use to add, configure, and display voice connections on the VISM:
dspvismparamDisplays the VISM configuration, including the voice mode (VoIP or VoAAL2).
cnfvismmodeChanges the VISM configuration, including the voice mode.
addportCreates a logical port on the VISM. This command must be used only once on the VISM.
delportRemoves the logical port from the VISM.
dspportLists the logical port on the VISM.
addrscprtnCreates a resource partition. This command must be used only once on the VISM.
delrscprtnRemoves a resource partition.
dsprscprtnDisplays the resource partition configuration.
cnflnsigChanges a line's signaling type.
dsplndspDisplays the line digital signal processor (DSP) configuration, including echo cancellation and voice activity detection (VAD).
cnfecanenableEnables or disables a line's echo cancellation.
cnfecanrecSets a line's residual echo control.
cnfecantailSets the maximum echo cancellation tail length between 24 and 128 milliseconds.
cnfcompvadEnables VAD on a line.
addendptCreates an endpoint on the VISM.
delendptRemoves an endpoint from the VISM.
addendptsAdds multiple, contiguous endpoints on the VISM.
delendptsRemoves multiple, contiguous endpoints from the VISM.
dspendptsLists all endpoints on the VISM.
dspendptLists detailed information for an endpoint.
addconCreates a new voice connection on the VISM.
delconRemoves a voice connection from the VISM.
dspconsLists summary status and configuration information for all connections on the VISM.
dspconLists detailed configuration information for a connection.
addcidCreates a new CID on the VISM that associates a connection with an endpoint.
delcidRemoves a CID from the VISM and disassociates a connection with an endpoint.
dspcidsLists configuration information for all CIDs on a connection.
dspcidLists configuration information for a CID.
Display VISM Parameter Command
The dspvismparam command shows the voice mode configuration for the VISM. Use this command to learn whether the VISM is configured for VoIP or VoAAL2 services. You can change the VISM's voice mode using the cnfvismmode command. Example 22-1 shows the dspvismparam output.
Example 22-1 dspvismparam Output
smoke.1.3.VISM8.a > dspvismparam VISM mode: aal2Trunking CAC flag: enable DS0s available: 240 Template number: 2 Percent of functional DSPs: 100 IP address: 0.0.0.0 Subnet mask 0.0.0.0 RTCP report interval: 1000 RTP receive timer: disable ControlPrecedence/Tos: 0x60 BearerPrecedence/Tos: 0xa0 Aal2 muxing status: disable Tftp Server Dn TFTPDOMIAN
The information shown in the dspvismparam output includes the following:
VISM modeEither AAL2 trunking or VoIP switching.
Connection Admission Control (CAC) flagSpecifies whether CAC is enabled or disabled on the VISM. This field applies only to VoIP mode.
DS0s availableThe number of channels available on the card. This number depends on the card type (T1 or E1) and the template in use. This field applies only to VoAAL2 mode.
Template numberSpecifies which template (1 or 2) is configured for the VISM. Template number 1 supports G.711u, G.711a, G.729a, G.729ab, G.726/32, and clear-channel codecs. Template 1 is not allowed in VoIP mode and reduces the number of channels supported on the card. Template number 2 supports G.711u, G.711a, and clear channel only. You can change the template using the cnfcodectmpl command.
Template number 1 in VISM Release 2.1 supports G.711u, G.711a, G.729a, G.729ab, G.726/32, and clear-channel codecs, plus G.726 16K, 24K, 32K, and 40K codecs.
Percent of functional DSPsThe percentage of DSPs that are fully functional on the VISM.
IP addressThe IP address of the VISM used in VoIP mode.
Subnet maskThe subnet mask that the VISM uses in VoIP mode.
Real-time Transport Control Protocol (RTCP) report intervalThe amount of time between RTCP messages for VoIP.
Real-time Transport Protocol (RTP) receive timerThe amount of time between expected RTP messages.
Control precedenceControl precedence for IP packets is a type of service (ToS) that conforms to RFC 1349. It determines which IP packets have higher priority as defined by the bearer precedence.
Bearer precedenceBearer precedence for IP packets conforms to RFC 791. It can be in the priority range of 0 to 7. You can adjust the precedence of the bearer IP packets as follows: 0 = low priority, 7 = high priority. The priority levels help ensure timely delivery of all traffic in a heterogeneous network.
AAL2 multiplexing statusSpecifies whether multiple voice streams can be multiplexed onto the same AAL2 connection. You can change this field using the cnfaal2subcellmuxing command.
TFTP server domain nameThe domain name of the TFTP server.
Configure VISM Mode Command
The cnfvismmode command changes the VISM card's voice mode. Use this command if you need to change the VISM to or from VoIP or VoAAL2.
Here is the cnfvismmode command syntax:
mode is either 1 for VoIP or 2 for VoAAL2.
For example, type cnfvismmode 2 to change the mode from VoIP to VoAAL2.
Add Port Command
The addport command creates a logical interface between the VISM and the PXM1. You must type this command before you add any endpoints, connections, or CIDs on the VISM. This command has no required or optional parameters.
Display Port Command
The dspport command shows the VISM port status. Use this command to verify that the port was added. You can delete the port using the delport command.
Example 22-2 shows the dspport output.
Example 22-2 dspport Output
smoke.1.3.VISM8.a > dspport vismPortNum: 1 vismPortRowStatus: add vismPortSpeed: 60000 vismPortState: active
The information shown in the dspport output includes the following:
Port numberAlways 1.
Port row statusThe row status is add unless the port is modified. In that case, the status is mod.
Port speedIndicates the amount of voice traffic that the VISM can send to the PXM1.
Port stateIn most cases, the port state is active.
Add Resource Partition Command
The addrscprtn command creates resource partitions on the VISM port. You must issue this command after adding the port and before you add any endpoints, connections, or CIDs to the VISM. You can remove the resource partition using the delrscprtn command.
Here is the addrscprtn command syntax:
addrscprtn <controller ID>
controller ID is 1 for Portable AutoRoute (PAR).
For example, type addrscprtn 1 to add the PAR resource partition to the VISM port.
Display Resource Partition Command
The dsprscprtn command shows the resource partition configuration. Note that the resource partition cannot be configured. Example 22-3 shows the dsprscprtn output.
Example 22-3 dsprscprtn Output
smoke.1.1.VISM8.a > dsprscprtn vismResPartPortNum: 1 vismResPartCtrlrNum: par vismResPartRowStatus: add vismResPartNumOfLcnAvail: 72 vismResPartLcnLow: 131 vismResPartLcnHigh: 510 vismResPartIngrPctBW: 100 vismResPartEgrPctBW: 100 vismResPartCtrlrID: 1
The information shown in the dsprscprtn output includes the following:
Port numberAlways 1.
Controller numberAlways par.
Row statusAlways add.
Number of logical connection numbers (LCNs) availableThe number of channels that you can add on the VISM.
LCN lowThe minimum LCN or channel number allowed.
LCN highThe maximum LCN or channel number allowed.
Ingress percent bandwidthThe percentage of the ingress port bandwidth allocated to this resource partition.
Egress percent bandwidthThe percentage of the egress port bandwidth allocated to this resource partition.
Controller IDAlways 1 for PAR.
Configure Line Signaling Command
The cnflnsig command sets the signaling method of a T1 or E1 line. Use this command to enable CAS or CCS signaling on the line. Even if the physical line is set for CCS using the cnfln command, you must use the cnflnsig command to set up the signaling method. Use the dspln command to learn the line-signaling configuration.
Here is the cnflnsig command syntax:
cnflnsig <line number> <signaling type>
The parameter options are as follows:
line numberThe T1 or E1 line number. 1 to 8.
signaling typeThe voice signaling type. 1 = CAS, 2 = CCS, 3 = no signaling.
For example, type cnflnsig 2 1 to enable CAS signaling on line number 2.
Display Line DSP Command
The dsplndsp command shows the DSP configuration for a line. Use this command to learn the echo cancellation and VAD settings. Example 22-4 shows the dsplndsp output.
Example 22-4 dsplndsp Output
smoke.1.1.VISM8.a > dsplndsp 8 VismLineNum: 8 ECANEnable: enable MaximumTail: 32 milliseconds ResidualEcho: SuppressResidual VoiceDetection: Enable
The information shown in the dsplndsp output includes the following:
VismLineNumRepresents the VISM card line number.
Echo cancel enableEnabled or disabled. Use the cnfecanenable command to change this field.
Maximum tailThe maximum tail length (delay) for the echo canceller. Choices include 24, 32, 48, 64, 80, 96, 112, and 128 milliseconds. Use the cnfecantail command to change this field.
Residual echoThe echo canceller's action for residual echo. Residual echo is what is left over after the echo is cancelled due to the echo model's being imperfect. Choices include cancel only, suppress residual, or inject comfort noise. Use the cnfecanrec command to change this field.
Voice detectionSpecifies whether VAD is enabled or disabled. Use the cnfcompvad command to change this field.
Add Endpoint and Add Endpoints Commands
The addendpt and addendpts commands are used to add new endpoints on the VISM. The addendpt command creates one endpoint, and the addendpts command creates multiple contiguous endpoints. It is recommended that you use the addendpts command to create endpoints on all available channels when you start configuring your VISM. You must add endpoints before adding connections and CIDs to the VISM. Use the delendpt and delendpts commands to delete endpoints on the VISM.
Here is the addendpt command syntax:
addendpt <endpoint number> <DS1 number> <DS0 number>
Here is the addendpts command syntax:
addendpts <endpoint number> <DS1 number> <DS0 number> <number of endpoints>
The parameter options are as follows:
endpoint numberUsed when you add a CID. 1 to 192 for T1, 1 to 240 for E1.
DS1 numberThe T1 or E1 line number. 1 to 8.
DS0 numberThe DS0 or (starting) timeslot number. 1 to 24 for T1, 1 to 31 for non-CAS E1, 1 to 15 and 17 to 31 for CAS E1.
number of endpoints (addendpts only)The number of contiguous endpoints you want to add. 1 to 192 for T1, 1 to 240 for E1.
For example, type addendpt 1 4 8 to add endpoint 1 to timeslot 8 on line 4; type addendpts 2 4 9 10 to add 10 endpoints starting with endpoint number 2 on timeslot 9 on line 4.
Display Endpoints Command
The dspendpts command lists all the endpoints configured on the VISM. Use this command to learn which endpoints exist. Example 22-5 shows the dspendpts output.
Example 22-5 dspendpts Output
smoke.1.3.VISM8.a > dspendpts EndptNum Ena/Speed -------- --- ----- 1 act/ 64k 2 act/ 64k 3 act/ 64k 4 act/ 64k 5 act/ 64k 6 act/ 64k 7 act/ 64k 8 act/ 64k 9 act/ 64k 10 act/ 64k 11 act/ 64k 12 act/ 64k 13 act/ 64k 14 act/ 64k 15 act/ 64k 16 act/ 64k 17 act/ 64k 18 act/ 64k 19 act/ 64k 20 act/ 64k Type <CR> to continue, Q<CR> to stop:
Display Endpoint Command
The dspendpt command shows detailed information about an endpoint. Use this command to learn which line and timeslot an endpoint is associated with. Example 22-6 shows the dspendpt output.
Example 22-6 dspendpt Output
smoke.1.1.VISM8.a > dspendpt 1 EndptNum: 1 EndptLineNum: 8 EndptName: E1email@example.com EndptSpeed: 64 kbps EndptState: active EndptChannelMap: 2 EndptEnable: active EndptLoopback: disabled
The dspendpt output includes the following information:
EndptNumThe endpoint number.
EndptLineNumThe line an endpoint is associated with.
EndptNameThe endpoint name in the form line type-line number/endpoint number@domain name. line type is T1 or E1, and domain name is the VISM domain name that is used for VoIP signaling messages. The default domain name is cisco.com. In Example 22-6, E1firstname.lastname@example.org is endpoint 1 on E1 line 8.
EndptSpeedThe endpoint speed. Either 56 or 64 kbps.
EndptStateThe endpoint state, usually active.
EndptChannel MapA hexadecimal number representing the timeslot assigned to the endpoint. If you convert this number into a binary number, each bit represents a timeslot. The least-significant digit (on the right) is timeslot 1; the most-significant digit (on the left) is the highest timeslot number. Notice that leading zeros are not shown. In Example 22-6, the channel map is 2, which is a binary 10. This means that timeslot 1 is assigned to this endpoint. (Because this is an E1, timeslot 0, the least-significant bit is reserved for framing.)
EndptLoopbackThe endpoint loopback state, either enabled or disabled. You can loop the endpoint using the addendptloop command and remove an endpoint using the delendptloop command.
Add Connection Command
The addcon command is used to create a new voice connection on the VISM. You can use the delcon command to remove the connection.
Here is the addcon command syntax:
addcon <local VCI> <preference> <PVC type> <application> <PCR> <mastership> [remote connection ID]
The parameter options are as follows:
local VCIThe LCN number. You use this number when you configure a CID. 131 to 510.
preferenceSpecifies a primary or secondary channel for redundancy purposes. 1 = primary, 2 = secondary.
PVC type1 = AAL5 used for VoIP and signaling channels, 2 = AAL2 for VoAAL2 channels, 3 = AAL1 (not supported).
applicationSpecifies how the connection is used. 1 = control for VoIP when a separate control channel is used, 2 = bearer for voice traffic, 3 = signaling for VoAAL2.
PCRThe connection's Peak Cell Rate (PCR). For connections in which multiple voice circuits are multiplexed onto one connection, you need to calculate the PCR based on the aggregate rate of the supported voice calls. 1 to 75,600 cells per second (cps) for AAL5 bearer PVC, 1 to 24,400 cps for AAL5 control PVC, 1 to 50,000 cps for T1 AAL2 bearer PVC, 1 to 60,000 cps for E1 AAL2 bearer PVC, 1 to 400 cps for signaling PVC in AAL2 trunking mode.
mastership1 = master, 2 = slave. If you are adding a slave connection, you do not need to specify the mastership or the remote connection ID.
remote connection IDThe destination connection ID for master connections in the form node name.card slot.port.VPI.VCI. If you are adding a feeder connection to the PXM1, card slot must be 0. If you are adding a local connection to another VISM, port is always 1, VPI is always 0, and VCI is the remote LCN. If you are adding a local connection to an ATM interface, you must specify the port, VPI, and VCI on the ATM side.
Display Connections Command
The dspcons command lists summary status information for all connections on the VISM. Example 22-7 shows the dspcons output.
Example 22-7 dspcons Output
smoke.1.3.VISM8.a > dspcons ConnId ChanNum Status Preference Protection Active Locking ------- ------- ------ ---------- ---------- ------- -------- smoke.22.214.171.124 131 Mod 1 unprotected unknown unlock smoke.126.96.36.199 132 Add 1 unprotected unknown unlock smoke.188.8.131.52 133 Add 1 unprotected unknown unlock
The dspcons output includes the following information:
Connection IDThe local connection ID in the form node name.card slot.1.0.LCN
Channel numberThe local VCI or LCN
StatusAdd or Mod (modify)
PreferenceSpecifies a primary (1) or secondary (2) channel
ProtectionThe redundancy protection type
ActiveThe redundancy state
LockingThe redundancy locking
Display Connection Command
The dspcon command shows detailed configuration information for a connection. Example 22-8 shows the dspcon output. There are two pages to the dspcon output; the second page is shown in Example 22-9.
Example 22-8 dspcon Output, Page 1
smoke.1.3.VISM8.a > dspcon 131 ChanNum: 131 ChanRowStatus: Mod ChanLocalRemoteLpbkState: Disabled ChanTestType: TestOff ChanTestState: NotInProgress ChanRTDresult: 65535 ms ChanPortNum: 1 ChanPvcType: AAL2 ChanConnectionType: PVC ChanLocalVpi: 0 ChanLocalVci: 131 ChanLocalNSAP: 736d6f6b65000000000000000000000003000100 ChanRemoteVpi: 0 ChanRemoteVci: 131 ChanRemoteNSAP: 736d6f6b65000000000000000000000001000100 ChanMastership: Master ChanVpcFlag: Vcc ChanConnServiceType: CBR ChanRoutingPriority: 1 ChanMaxCost: 4294967295 ChanRestrictTrunkType: No Restriction Type <CR> to continue, Q<CR> to stop:
Many of the fields listed in the dspcon output can be modified using a number of configuration commands discussed in this section. Other information in the dspcon output includes the following:
RTD resultThe result of the most recent round-trip delay test (use the tstdelay command). If the test has never been run, it reports 65,535 milliseconds.
Channel local NSAPThe network service access point (NSAP) address uniquely identifies this interface (port) in the network. The 20-byte hexadecimal address has the following fields:
The most-significant 8 bytes (16 digits) spell out the node name in ASCII. The connection in Example 22-8 is on node smoke.
The card slot number is the fourth byte from the right. The connection in Example 22-8 is on card 3.
The port number is the second byte from the right. All VISM connections are on port 1.
Example 22-9 shows the second page of the dspcon output.
Example 22-9 dspcon Output, Page 2
ChanConnPCR: 100 ChanConnPercentUtil: 100 ChanPreference: 1 ChanRemotePCR: 100 ChanRemotePercentUtil: 100 ChanProtection: unprotected ChanActivityState: unknown ChanLockingState: unlock ChanApplication: bearerf ChanServiceType: cbr ChanScrIngress: 100 ChanMbsIngress: 100 ChanNumNextAvailable: 132
Add CID Command
The addcid command creates a new CID that associates a connection with an endpoint. You can add multiple CIDs to a connection, but each must have a different endpoint and CID. Use the delcid command to delete a CID from the VISM.
Here is the addcid command syntax:
addcid <endpoint number> <LCN> <CID number> <codec type> [profile type] [profile number] [VAD] [VAD initialization timer] [echo cancellation] [triple redundancy protection] [CAS transport] [DTMF transport] [ICS] [packet period]
The parameter options are as follows:
endpoint numberThe endpoint associated with this CID. Only one CID can be associated with an endpoint. 1 to 192 for T1 cards, 1 to 240 for E1 cards.
LCNThe logical connection number. 131 to 510.
CID numberThe CID must be unique per connection (LCN). 9 to 255.
codec typeThe voice compression type. 1 = G.711u, 2 = G.711a, 3 = G.726/32, 4 = G.729a, 5 = G.729ab, 6 = clear channel. (VAD must be off when the codec is clear-channel.)
profile type1 = ITU, 3 = custom. This parameter is required if codec type is G.729a/ab.
profile number1, 2, or 7 for ITU. 100 or 101 for custom. Use the dspaal2profile command to see the profile characteristics. Be sure to use a profile that supports the compression type (codec type) you are using. This parameter is required if codec type is G.729a/ab.
VADEnables or disables VAD. 1 = VAD on, 2 = VAD off (the default).
VAD initialization timerDetermines how long to wait after a speech burst before starting VAD. If this time is too short, you might experience clipping. If it is too long, you might not get the bandwidth savings you require. 250 to 65,535 milliseconds.
echo cancellationEnables or disables echo cancellation. 1 = on (default), 2 = off.
triple redundancy protectionEnables or disables triple redundancy protection. 1 = on, 2 = off.
CAS transportEnables or disables the transport of CAS signaling bits in the AAL2 traffic stream. 1 = on (default), 2 = off.
DTMF transportEnables or disables the transport of DTMF tones in the AAL2 traffic stream (inband). 1 = on (default), 2 = off.
Integrated Communications System (ICS)1 = enable, 2 = disable.
packet periodThe amount of time between G.729a packets. 10, 20, 30, or 40 milliseconds.
For example, type 1131 9 1 1 1 1 300 1 2 1 1 1 to create CID number 9 associated with endpoint 1 and LCN 131. This CID is set for G.711u and uses ITU profile number 1.
Display CIDs Command
The dspcids command lists all the CIDs on a specified LCN. Use this command to learn which CIDs are on a connection and how they are configured. Example 22-10 shows the dspcids command output.
Example 22-10 dspcids Output
smoke.1.1.VISM8.a > dspcids 132 LCN CID Endpt Cid Type3 VAD Prof Prof Codec Cas DTMF ICS Pkt Num Num Num Status Redun VAD Timer Type Num Type Tran Tran Ecan Enable Per. --- --- ----- ------ ----- --- ----- ----- ---- ------ ---- ---- ---- ------ ---- 132 10 2 active ena ena 250 ITU 1 G.711u ena ena ena Dis 5 132 22 3 active ena ena 250 ITU 1 g.711u ena ena ena Dis 5
The dspcids output shows all the characteristics you set using the addcid command.
Display CID Command
The dspcid command shows the same information as the dspcids output, but for a specific CID. Example 22-11 shows the dspcid output.
Example 22-11 dspcid Output
smoke.1.3.VISM8.a > dspcid 131 9 LCN number : 131 CID number: 9 Endpoint number : 50 CidRowStatus: active Type3redundancy: enabled VAD: disabled VADInitTimer: 200 Profile type: Custom Profile number: 100 Codec type: clr chan Cas transport: enabled DTMF transport: enabled Ecan on/off: enabled ICS enable: Disabled pkt period: 5