Configuring the Trunk and Subtended Interfaces

Table Of Contents

Configuring the Trunk and Subtended Interfaces

NI-2 Card and DSLAM Compatibility

NI-2 Subtending Support

Configuring 155 Mbps OC-3 SM and MM Interfaces

Default 155 Mbps ATM Interface Configuration Without Autoconfiguration

Manual 155 Mbps Interface Configuration

Configuring DS3 and E3 Interfaces

Default DS3 ATM Interface Configuration Without Autoconfiguration

Manual DS3 and E3 Interface Configuration

Interface Configuration Troubleshooting

Configuring the Trunk and Subtended Interfaces

This chapter describes the steps required to configure the trunk and subtended interfaces on the Cisco DSLAM NI-2 card and includes these sections:

• NI-2 Card and DSLAM Compatibility

• NI-2 Subtending Support

• Configuring 155 Mbps OC-3 SM and MM Interfaces

• Configuring DS3 and E3 Interfaces

• Interface Configuration Troubleshooting

NI-2 Card and DSLAM Compatibility

The following shows the NI-2 card and DSLAM chassis compatibility with regard to both trunk and subtending connections.

NI-2 Card

Cisco 6015

Cisco 6100 / Cisco 6130

Cisco 6160

Cisco 6260

DS3+T1/E1 IMA¹

•DS3 trunk

•T1/E1 trunk and subtending

•T1/E1 IMA trunk and subtending

Yes

No

Yes²

No

DS3/2DS3

•DS3 trunk

•two DS3 subtending ports

No

Yes

Yes

Yes³

OC-3c/OC-3c single-mode fiber (SMF)

•OC-3c trunk

•one OC-3c subending port

No

Yes

Yes

Yes^⁴

OC-3c/OC-3c multimode fiber (MMF)

•OC-3c trunk

•one OC-3c subending port

No

Yes

Yes

Yes⁴

OC-3c/2DS3 single-mode fiber (SMF)

•OC-3c trunk

•two DS3 subtending ports

No

No

Yes

No

OC-3c/2DS3 multimode fiber (MMF)

•OC-3c trunk

•two DS3subending ports

No

No

Yes

No

¹inverse multiplexing over ATM.

²Use only with the DS3/2DS3+8xT1 system I/O card.

³When the E3 1/0 module is installed, the system assumes E3 funtionality.

⁴When the OC-3c I/O module is installed, the system assumes OC-3c functionality.

NI-2 Subtending Support

NI-2 cards offer the same level of service and traffic fairness in subtending Cisco 6015, Cisco 6100, Cisco 6130, Cisco 6160, and Cisco 6260 nodes. The level of service remains the same for both NI-1 and NI-2 based subtended nodes. (That is, you can mix NI-1 and NI-2 cards in the same subtending network for the Cisco 6100 and Cisco 6130 chassis.)

The following guidelines apply to subtending on an NI-2 supported DSLAM:

•For the Cisco 6100 and Cisco 6130, the NI-2 accepts the same virtual path (VP) and virtual circuit (VC) constraints that exist on the NI-1.

•The NI-2 allows subtending for up to 1664 ports per system.

–The Cisco 6015 has one subtend host chassis and up to six subtended node chassis.

–The other chassis have one subtend host chassis and up to twelve subtended node chassis.

•The NI-2 supports tree and daisy chain subtending.

Configuring 155 Mbps OC-3 SM and MM Interfaces

You can configure the NI-2 ports as redundant links using the switch routing protocols. The NI-2 card supports system controller-type connectors.

Each port can be configured to support these clocking options:

•Self-timing based on a Stratum three-level clock

•Loop timing from the received data stream—Ideal for public network connections

•Timing synchronized to a selected master clock port—Required to distribute a single clock across a network

Traffic pacing allows you to set the aggregate output traffic rate on any port to a rate below the line rate. This feature is useful when communicating with a slow receiver or when connected to public networks with peak-rate tariffs.

The plug-and-play mechanisms of the DSLAM allow the interface to launch automatically. You can save all configuration information between hot swaps and reboots, while interface types are automatically discovered by the DSLAM, eliminating the need for mandatory manual configuration.

Default 155 Mbps ATM Interface Configuration Without Autoconfiguration

If Interim Local Management Interface (ILMI) has been disabled or if the connecting end node does not support ILMI, these defaults are assigned to all 155 Mbps (OC-3c) interfaces:

•ATM interface type = user network interface (UNI)

•UNI Version = 3.1

•Maximum virtual path identifier (VPI) bits = 8

•Maximum virtual channel identifier (VCI) bits = 14

•ATM interface side = network

•ATM UNI type = private

•Framing = sts-3c

•Clock source = network-derived

•Synchronous Transfer Signal (STS) stream scrambling = enabled

•Cell payload scrambling = enabled

The default subtend ID for each NI-2 DSLAM is 0 (zero).

Manual 155 Mbps Interface Configuration

To manually change any of the default configuration values, perform these tasks, beginning in global configuration mode.

Step

Command

Task

1.

DSLAM#configure terminal

Go to global configuration mode.

2.

DSLAM(config)#subtend-id 0-12

Assign to this node a subtend ID that is unique in the subtend tree. The node attached to the trunk must have subtend ID 0.

3.

DSLAM(config)#interface atm slot/port

Specify an ATM interface and enter interface configuration mode.

4.

DSLAM(config-if)#atm uni [side {network | user} type {private | public} version {3.0 | 3.1 | 4.0}]

Modify the ATM interface side, type, or version.

5.

DSLAM(config-if)#atm maxvpi-bits 0-8

Modify the maximum VPI bits configuration.

6.

DSLAM(config-if)#atm maxvci-bits 0-14

Modify the maximum VCI bits configuration.

7.

DSLAM(config-if)#sonet {stm-1 | sts-3c}

Modify the framing mode.

8.

DSLAM(config-if)#clock source {free-running | loop-timed | network-derived}

Modify the clock source.

9.

DSLAM(config-if)#scrambling {cell-payload | sts-stream}

Modify the scrambling mode.

10.

DSLAM(config-if)#exit

Return to global configuration mode.

11.

DSLAM(config)#subtend-id 0-12

Assign to this interface a subtend ID that is unique in the subtend tree. (This subtend ID identifies the subtended node attached to the interface, in the case where the attached node does not support the subtend ID feature.)

Note Note that Steps 1 and 9 are alternatives; do not perform both steps.

Examples

This example shows how to change the default ATM interface type to private using the atm uni type private command.

DSLAM#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
DSLAM(config)#interface atm 0/0
DSLAM(config-if)#atm uni type private
This example shows how to change the clock source using the clock source network-derived command.

DSLAM#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
DSLAM(config)#interface atm 0/0
DSLAM(config-if)#clock source network-derived

Note Refer to the "Interface Configuration Troubleshooting" section, to confirm your interface configuration.

Configuring DS3 and E3 Interfaces

Use the 45-Mbps DS3 to:

•Set up wide-area connections

•Link multiple campuses

•Connect to public networks

The ports can be set up as redundant links for use by sophisticated switch routing protocols.

You can configure each port to support these clocking options:

•Self-timing based on a Stratum 4 level clock

•Loop timing from the received data stream—Ideal for public network connections

•Timing synchronized to a selected master clock port—Required to distribute a single clock across a network

Note Network clocking configuration options are applicable only to DS3 quad interfaces.

Traffic pacing allows you to set the aggregate output traffic rate on any port to a rate below the line rate. This feature is useful when communicating with a slow receiver or when connected to public networks with peak-rate tariffs.

The plug-and-play mechanisms of the DSLAM allow the interface to launch automatically. You can save all configuration information between hot swaps and reboots, while interface types are automatically discovered by the DSLAM, eliminating the need for mandatory manual configuration.

Default DS3 ATM Interface Configuration Without Autoconfiguration

If ILMI has been disabled or if the connecting end node does not support ILMI, these defaults are assigned to all DS3 interfaces:

•ATM interface type = UNI

•UNI Version = 3.0

•Maximum VPI bits = 8

•Maximum VCI bits = 14

•ATM interface side = network

•ATM UNI type = private

These defaults are assigned to all DS3 interfaces:

•Framing = cbit-adm

•Cell payload scrambling = disabled

•Clock source = network-derived

•Electrical line build out (LBO) = short

•Auto-far-end remote failure(ferf) on loss of signal (LOS) = on

•Auto-ferf on out of frame (OOF) = on

•Auto-ferf on red = on

•Auto-ferf on loss of cell delineation (LCD ) = on

•Auto-ferf on alarm indication signaling (AIS) = on

These defaults are assigned to all E3 interfaces:

•Framing = G.832 adm

•Cell payload scrambling = on

•Clock source = network-derived

•Auto-ferf on LOS = on

•Auto-ferf on OOF = on

•Auto-ferf on LCD = on (applicable to nonplcp mode only)

•Auto-ferf on AIS = on

The default subtend ID for each NI-2 DSLAM is 0 (zero).

Manual DS3 and E3 Interface Configuration

To manually change any of the DS3 or E3 default configuration values, perform these tasks, beginning in global configuration mode.

Step

Command

Task

1.

DSLAM#configure terminal

Go to global configuration mode.

1.

DSLAM(config)#subtend-id 0-12

Assign to this node a subtend ID that is unique in the subtend tree. The node attached to the trunk must have subtend ID 0.

2.

DSLAM(config)#interface atm slot/port

Specify an ATM interface and enter interface configuration mode.

3.

DSLAM(config-if)#atm uni [side {network | user} type {private | public} version {3.0 | 3.1 | 4.0}]

Modify the ATM interface side, type, or version.

4.

DSLAM(config-if)#atm maxvpi-bits 0-8

Modify the maximum VPI bits configuration.

5.

DSLAM(config-if)#atm maxvci-bits 0-14

Modify the maximum VCI bits configuration.

6.

DSLAM(config-if)#framing {cbitadm | cbitplcp | m23adm | m23plcp}

Modify the framing mode.

7.

DSLAM(config-if)#scrambling {cell-payload | sts-stream}

Modify the scrambling mode.

8.

DSLAM(config-if)#clock source {free-running | loop-timed | network-derived}

Modify the clock source.

9.

DSLAM(config-if)#network-clock-select {1-4_priority} atm slot/port

Configure the network-derived clock.

10.

DSLAM(config-if)#lbo {long | short}

Modify the line build-out.

11.

DSLAM(config-if)#auto-ferf {ais | lcd | los | oof | red}

Modify the auto-ferf configuration.

12.

DSLAM(config-if)#exit

Return to global configuration mode.

13.

DSLAM(config)#subtend-id 0-12

Assign to this interface a subtend ID that is unique in the subtend tree. (This subtend ID identifies the subtended node attached to the interface, in the case where the attached node does not support the subtend ID feature.)

Note Note that Steps 1 and 9 are alternatives; do not perform both steps.

Examples

This example shows how to change the default ATM interface type to private using the atm uni type private command.

DSLAM#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
DSLAM(config)#interface atm 0/0
DSLAM(config-if)#atm uni type private
This example shows how to change the clock source using the clock source network-derived command.

DSLAM#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
DSLAM(config)#interface atm 0/0
DSLAM(config-if)#clock source network-derived

Note Refer to the "Interface Configuration Troubleshooting" section, to confirm your interface configuration.

Interface Configuration Troubleshooting

The following are privileged EXEC mode commands that you can use to confirm that the hardware, software, and interfaces for the DSLAM are configured as intended.

Command

Description

DSLAM#show version

Confirm the correct version and type of software is installed.

DSLAM#show hardware

Confirm the type of hardware installed in the system.

DSLAM#show interface ethernet [slot/port]

Confirm the type of hardware installed in the system.

DSLAM#show atm addresses

Confirm the ATM address is configured correctly.

DSLAM#ping atm interface atm [slot/port] [vpi] ip-address xxx.xxx.xxx.xxx

Test for connectivity between the DSLAM and a host.

DSLAM#show {atm | ces} interface

Confirm the ATM interfaces are configured correctly.

DSLAM#show atm status

Confirm the status of the ATM interfaces.

DSLAM#show atm vc

Confirm the status of ATM virtual interfaces.

DSLAM#show running-config

Confirm the configuration being used is configured correctly.

DSLAM#show startup-config

Confirm the configuration saved in NVRAM is configured correctly.

DSLAM#show controller {atm | ethernet}

Confirm interface controller memory addressing.

You can also view an ATM layer fault state and loss of cell delineation using the CLI and MIB. The default alarm level for this fault state is major.

The following are privileged EXEC mode commands you can use to initiate line loopbacks.

Command

Description

DSLAM#loopback diagnostic

Diagnostic loopback. The outgoing cells are looped back toward the switch. This command is available on all ports.

DSLAM#loopback line

Line loopback. The incoming line is looped back toward the coax. This command is available only on trunk and subtending ports.

DSLAM#loopback payload

Payload loopback: The incoming payload is looped back toward the coax. This command is available only on DS3 trunk and subtending ports.

NI-2 Card	Cisco 6015	Cisco 6100 / Cisco 6130	Cisco 6160	Cisco 6260
DS3+T1/E1 IMA¹ •DS3 trunk •T1/E1 trunk and subtending •T1/E1 IMA trunk and subtending	Yes	No	Yes²	No
DS3/2DS3 •DS3 trunk •two DS3 subtending ports	No	Yes	Yes	Yes³
OC-3c/OC-3c single-mode fiber (SMF) •OC-3c trunk •one OC-3c subending port	No	Yes	Yes	Yes^⁴
OC-3c/OC-3c multimode fiber (MMF) •OC-3c trunk •one OC-3c subending port	No	Yes	Yes	Yes⁴
OC-3c/2DS3 single-mode fiber (SMF) •OC-3c trunk •two DS3 subtending ports	No	No	Yes	No
OC-3c/2DS3 multimode fiber (MMF) •OC-3c trunk •two DS3subending ports	No	No	Yes	No

Step	Command	Task
1.	DSLAM#configure terminal	Go to global configuration mode.
2.	DSLAM(config)#subtend-id 0-12	Assign to this node a subtend ID that is unique in the subtend tree. The node attached to the trunk must have subtend ID 0.
3.	DSLAM(config)#interface atm slot/port	Specify an ATM interface and enter interface configuration mode.
4.	DSLAM(config-if)#atm uni [side {network \| user} type {private \| public} version {3.0 \| 3.1 \| 4.0}]	Modify the ATM interface side, type, or version.
5.	DSLAM(config-if)#atm maxvpi-bits 0-8	Modify the maximum VPI bits configuration.
6.	DSLAM(config-if)#atm maxvci-bits 0-14	Modify the maximum VCI bits configuration.
7.	DSLAM(config-if)#sonet {stm-1 \| sts-3c}	Modify the framing mode.
8.	DSLAM(config-if)#clock source {free-running \| loop-timed \| network-derived}	Modify the clock source.
9.	DSLAM(config-if)#scrambling {cell-payload \| sts-stream}	Modify the scrambling mode.
10.	DSLAM(config-if)#exit	Return to global configuration mode.
11.	DSLAM(config)#subtend-id 0-12	Assign to this interface a subtend ID that is unique in the subtend tree. (This subtend ID identifies the subtended node attached to the interface, in the case where the attached node does not support the subtend ID feature.)

Command	Description
DSLAM#show version	Confirm the correct version and type of software is installed.
DSLAM#show hardware	Confirm the type of hardware installed in the system.
DSLAM#show interface ethernet [slot/port]	Confirm the type of hardware installed in the system.
DSLAM#show atm addresses	Confirm the ATM address is configured correctly.
DSLAM#ping atm interface atm [slot/port] [vpi] ip-address xxx.xxx.xxx.xxx	Test for connectivity between the DSLAM and a host.
DSLAM#show {atm \| ces} interface	Confirm the ATM interfaces are configured correctly.
DSLAM#show atm status	Confirm the status of the ATM interfaces.
DSLAM#show atm vc	Confirm the status of ATM virtual interfaces.
DSLAM#show running-config	Confirm the configuration being used is configured correctly.
DSLAM#show startup-config	Confirm the configuration saved in NVRAM is configured correctly.
DSLAM#show controller {atm \| ethernet}	Confirm interface controller memory addressing.

Command	Description
DSLAM#loopback diagnostic	Diagnostic loopback. The outgoing cells are looped back toward the switch. This command is available on all ports.
DSLAM#loopback line	Line loopback. The incoming line is looped back toward the coax. This command is available only on trunk and subtending ports.
DSLAM#loopback payload	Payload loopback: The incoming payload is looped back toward the coax. This command is available only on DS3 trunk and subtending ports.