Configuring Basic Interface Settings

Configuring the Ethernet Interface

Configuring the HSSI Interface

Configuring the DS3 Interface

Configuring WAN Link Parameters

Setting the Link Type

Configuring Frame Relay

Mapping DLCIs to Network Addresses

Setting the Frame Relay Maintenance Protocol

Configuring PPP Compression

Configuring SMDS

Configuring Basic Interface Settings

This chapter describes how to configure interface settings that are not associated with a particular routing protocol.

Note For commands that require the interface slot and port, slot 0 is the far left slot for the VPN 5008 chassis, and the top slot for the VPN 5002 chassis. Ports are numbered starting with 0, so for a module with one port, the port is 0.

Configuring the Ethe rnet Interface

The Ethernet interface automatically senses 10BaseT or 100BaseT, and full or half duplex if you cabled the Ethernet port at startup. Otherwise, the port defaults to 10BaseT and half duplex. If the autosensing is not working, enter the Ethernet Interface section by entering:

configure Ethernet Interface Ethernet slot:port

Once in the Ethernet Interface section, you can configure the following parameters:

Table 4-1: Ethernet Interface Parameters

Action Command Description

Set the protocol to 10BaseT or 100BaseT.

Speed = {10meg | 100meg}
Sets the protocol if autosensing fails. Set the value required by your switch or hub.

Set the duplex mode to full or half duplex.

Duplex = {Full | Half}
Sets the duplex mode if autosensing fails. Set the value required by your switch or hub.

Action	Command	Description
Set the protocol to 10BaseT or 100BaseT.	Speed = {10meg \| 100meg}	Sets the protocol if autosensing fails. Set the value required by your switch or hub.
Set the duplex mode to full or half duplex.	Duplex = {Full \| Half}	Sets the duplex mode if autosensing fails. Set the value required by your switch or hub.

Configuring the HSSI Int erface

The HSSI interface uses the following default settings:

16-bit Cyclical Redundancy Check (CRC)
External clock

If you need to change these settings, enter the HSSI Interface section by entering:

configure HSSI Interface WAN slot:port

Once in the HSSI Interface section, you can configure the following parameters:

Table 4-2: HSSI Interface Parameters

Action Command Description

Change the CRC to 32 bits.

CRC = 32bit
Both ends of the connection need to use the same CRC setting.

Set the clock to internal.

Clocking = Internal
Use an external clock to connect to a CSU/DSU. Use an internal clock to connect to another HSSI port (with an external clock) back-to-back.

Action	Command	Description
Change the CRC to 32 bits.	CRC = 32bit	Both ends of the connection need to use the same CRC setting.
Set the clock to internal.	Clocking = Internal	Use an external clock to connect to a CSU/DSU. Use an internal clock to connect to another HSSI port (with an external clock) back-to-back.

Configuring the DS3 Int erface

The DS3 interface uses the following defaults:

16-bit CRC
0 to 100 feet cable length
Non-inverted data
Internal clock
44,210 bps data rate

If you need to change these settings, enter the DS3 Interface section by entering:

configure DS3 Interface WAN slot:port

Once in the DS3 Interface section, you can configure the following parameters:

Table 4-3: DS3 Interface Parameters

Action Command Description

Change the CRC to 32 bits.

CRC = 32bit
Both ends of the connection need to use the same CRC setting.

Set the clock to external.

Clocking = External
Set the clock to external if the DS3 port receives its clock from the DS3 signal. Check with your service provider for this setting.

Change the cable length to 101 to 900 feet.

LineBuildOut = Long

Set the data to inverted.

InvertData = On
You can use data inversion to meet pulse density requirements. Only set it to On if instructed by your service provider. If a DSU at one end of a DS3 line inverts its data, then the DSU at the other end must do the same.

Change the data rate.

DS3SubRate = {3_158 | 6_316 | 9_474 | 12_632 | 15_790 | 18_948 | 22_106 | 25_264 | 28_422 | 31_580 | 34_738 | 37_896 | 41_054 | 44_210}
Unless the remote end is a Larscom CSU/DSU (or equivalent) or another VPN 5002 or 5008 DS3 interface, you must use the default 44_210.

Action	Command	Description
Change the CRC to 32 bits.	CRC = 32bit	Both ends of the connection need to use the same CRC setting.
Set the clock to external.	Clocking = External	Set the clock to external if the DS3 port receives its clock from the DS3 signal. Check with your service provider for this setting.
Change the cable length to 101 to 900 feet.	LineBuildOut = Long
Set the data to inverted.	InvertData = On	You can use data inversion to meet pulse density requirements. Only set it to On if instructed by your service provider. If a DSU at one end of a DS3 line inverts its data, then the DSU at the other end must do the same.
Change the data rate.	DS3SubRate = {3_158 \| 6_316 \| 9_474 \| 12_632 \| 15_790 \| 18_948 \| 22_106 \| 25_264 \| 28_422 \| 31_580 \| 34_738 \| 37_896 \| 41_054 \| 44_210}	Unless the remote end is a Larscom CSU/DSU (or equivalent) or another VPN 5002 or 5008 DS3 interface, you must use the default 44_210.

Configuring WA N Link Parameters

The following sections allow you to set the WAN link type, including Frame Relay, PPP, or SMDS, and the parameters associated with each type.

Setting the Lin k Type

You can set a WAN interface for PPP, Frame Relay, or SMDS.

Command Purpose

Step 1

configure Link Config WAN slot:port
Identifies the port for which you want to configure the link type.

Step 2

Mode = {FrameRelay | PPP | SMDS | Off}
Sets the WAN link type or turns the interface off.

	Command	Purpose
Step 1	configure Link Config WAN slot:port	Identifies the port for which you want to configure the link type.
Step 2	Mode = {FrameRelay \| PPP \| SMDS \| Off}	Sets the WAN link type or turns the interface off.

Configuring Frame Relay

The following sections describe how to map a Data Link Control Identifier (DLCI) to a network address and how to identify the Frame Relay maintenance protocol.

Mapping DLCIs to Net work Addresses

By default, the system uses inverse Address Resolution Protocol (IARP) to determine the network addresses associated with the other end of the PVC.

You need to map the DLCI if IARP fails and you are using IPX, AppleTalk, or IP for a numbered interface. A numbered interface has an associated IP address.

IARP might not work if other routers on the Frame Relay network are not using IARP.

Do not map the DLCI if you use IP Frame Relay links as point-to-point connections with unnumbered interfaces or sub-interfaces. See the "Configuring a PPP or Point-to-Point Frame Relay Link" section instead of mapping the DLCI.

Follow these steps to map a DLCI to network addresses:

Command Purpose

Step 1

configure Frame Relay WAN slot:port
Identifies the port for which you want to configure Frame Relay.

Step 2

DLCI = DLCI_Number {[IP = IPAddress] [Apple = Net:Node] [IPX = Net:Node]}
DLCI_Number is the local DLCI.

IPAddress or Net:Node is the network of the router at the other end of the PVC.

	Command	Purpose
Step 1	configure Frame Relay WAN slot:port	Identifies the port for which you want to configure Frame Relay.
Step 2	DLCI = DLCI_Number {[IP = IPAddress] [Apple = Net:Node] [IPX = Net:Node]}	DLCI_Number is the local DLCI. IPAddress or Net:Node is the network of the router at the other end of the PVC.

Setting the Frame Relay Mainten ance Protocol

By default, the Frame Relay maintenance protocol is AnnexD, which is an ANSI standard that is the most commonly used standard in the United States. The maintenance protocol is used to send link status and virtual circuit information between Frame Relay switches and other devices (such as routers) that communicate with them. If you need to change to AnnexA, LMI, or Static, follow these steps:

Command Purpose

Step 1

configure Frame Relay WAN slot:port
Identifies the slot and port for which you want to configure Frame Relay.

Step 2

MaintProtocol = {AnnexD | AnnexA | LMI | Static}
AnnexD, the default, is the most commonly used standard in the United States.

AnnexA is a CCITT European standard.

LMI was developed by a vendor consortium and is also known as the "consortium" management interface specification. It is still used by some carriers in the United States.

Static is a method for using WAN broadcast media (for example satellite ground stations) to emulate a Frame Relay network. Do not use this setting for normal Frame Relay switch communications.

	Command	Purpose
Step 1	configure Frame Relay WAN slot:port	Identifies the slot and port for which you want to configure Frame Relay.
Step 2	MaintProtocol = {AnnexD \| AnnexA \| LMI \| Static}	AnnexD, the default, is the most commonly used standard in the United States. AnnexA is a CCITT European standard. LMI was developed by a vendor consortium and is also known as the "consortium" management interface specification. It is still used by some carriers in the United States. Static is a method for using WAN broadcast media (for example satellite ground stations) to emulate a Frame Relay network. Do not use this setting for normal Frame Relay switch communications.

Configuring PPP Comp ression

For a PPP link, you can turn on compression, which might improve throughput. Some types of traffic, however, might be hindered by compression, so monitor the link to determine if compression works for you. By default, compression is off. The remote device must also be enabled to use the same compression algorithm to successfully negotiate compression over the PPP link.

To turn on compression, follow these steps:

Command Purpose

Step 1

configure PPP WAN slot:port
Identifies the port for which you want to configure PPP.

Step 2

Compress = {SeqPred | Stac | Off}
SeqPred is the Sequenced Predictor Compression Control Protocol (CCP) algorithm. Sequenced Predictor is proprietary to VPN 5000 concentrators. It requires a VPN 5000 concentrator at the remote end.

Stac is the Stac LZS compression. LZS compression uses an algorithm to build a history of frequently repeated groups of 8-bit characters and creates shorter bit patterns to represent them. The VPN 5000 concentrator's current implementation of LZS does not support more than one history. It uses only a sequence value check byte for error detection.

	Command	Purpose
Step 1	configure PPP WAN slot:port	Identifies the port for which you want to configure PPP.
Step 2	Compress = {SeqPred \| Stac \| Off}	SeqPred is the Sequenced Predictor Compression Control Protocol (CCP) algorithm. Sequenced Predictor is proprietary to VPN 5000 concentrators. It requires a VPN 5000 concentrator at the remote end. Stac is the Stac LZS compression. LZS compression uses an algorithm to build a history of frequently repeated groups of 8-bit characters and creates shorter bit patterns to represent them. The VPN 5000 concentrator's current implementation of LZS does not support more than one history. It uses only a sequence value check byte for error detection.

Configuring SMDS

To use Switched Multi-megabit Data Service (SMDS), specify the station address and the IP Multicast address using the following steps:

Command Purpose

Step 1

configure SMDS WAN slot:port
Identifies the slot and port for which you want to configure SMDS.

Step 2

StationAddre ss = Address
The station address is assigned by the service provider and follows the E.164 format (64-bit/15-digit addressing). The station address must start with the letter C and be followed by at least 10 digits.

Step 3

IPMulticast = Address
The IP Multicast address is the SMDS group address assigned by the service provider and follows the E.164 format. The multicast address starts with the letter E and be followed by at least 10 digits.

	Command	Purpose
Step 1	configure SMDS WAN slot:port	Identifies the slot and port for which you want to configure SMDS.
Step 2	StationAddre ss = Address	The station address is assigned by the service provider and follows the E.164 format (64-bit/15-digit addressing). The station address must start with the letter C and be followed by at least 10 digits.
Step 3	IPMulticast = Address	The IP Multicast address is the SMDS group address assigned by the service provider and follows the E.164 format. The multicast address starts with the letter E and be followed by at least 10 digits.

Table of Contents

Configuring Basic Interface Settings