ZyXEL Communications PRESTIGE 153X Betriebsanleitung

Prestige 153X

WAN Access Router

User's Guide Supplement

ZyXEL

TOTAL INTERNET ACCESS SOLUTION

Prestige 153X Supplement

User's Guide Supplement 1

The Prestige 153X now supports Frame Relay! You may have up to 6 simultaneous frame relay connections

i.e., 3 PVCs on WAN port 1or 2. Each PVC has its own encapsulation type, DLCI (Data Link Connection

Identifier), CIR (Committed Information Rate) and EIR (Excess Information Rate). When frame relay is not

used, the WAN port can also be configured to run PPP over HDLC on a leased-sync line. The Connection

Type must be set to Leased-Sync to configure Frame Relay (so only P153X WAN ports 1 and/or 2 may be

used). Each of these ports can be configured as either the network side or the user side of the UNI interface.

The options for the Connection Type field are shown in the following table. UNI (User Network Interface)

defines the connection between user equipment and the Frame Relay network.

Network Frame relay is configured as the network side of the UNI interface.

User Frame relay is configured as the user side of the UNI interface.

Connection

Type

None Runs PPP over HDLC without frame relay on a leased-sync line.

1.1 What is Frame Relay?

This is some background information on frame relay. Please skip ahead if you wish to begin configuring your

Prestige for Frame Relay right away.

Frame relay is a form of packet-switching technology that routes frames of information from source to

destination over a switching network owned by a carrier. Suppose a corporate network has 4 sites, site A, site

B, site C and site D (as shown in the next figure) and you need to interconnect these sites with both data links

and voice lines. As data traffic is relatively continuous throughout the day one solution (though inefficient)

would be to set up dedicated leased lines connecting each office as shown in Figure 1.

Figure 1 Dedicated Leased Lines – Multiple Sites

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The frame relay solution would be to rent short dedicated leased lines to the carriers frame relay access point

and then the carrier programs virtual circuits into the network between your sites.

Figure 2 Frame Relay Solution

Frames are “relayed” through switches in the network, creating basically a virtual private network (VPN)

between linked sites. This logical point-to-point circuit between customer sites is called a VC (virtual circuit)

of which there are two types. Permanent VCs (PVCs) have constant end points and need to be set up in

advance while switched VCs (SVCs) are set up on the fly as needed. The Prestige supports PVCs only.

1.1.1 Frame relay frame format

The frame format for frame relay is as follows.

Bytes

1 2-4 0-4,000 2 1

Flag Link Info Data FCS Flag

Upper DLCI (6 bits) C/R EA 0

Lower DLCI (4 bits) FECN BECN DE EA 1

Figure 3 Frame Relay Format

Each frame is described as follows:

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User's Guide Supplement 3

Table 1 Frame Relay Format

Frame Description

FLAG The flag field holds the “Start of frame” marker.

LINK INFO This field holds the logical connection address and control fields as described here:

DLCI DLCI (data link connection identifier) identifies the logical connections.

C/R Command/Response bit related to congestion control.

EA EA (extended address) is used to extend the header field to support DLCI addresses of

more than 10 bits.

FECN FECN (forward explicit congestion notification) warns receivers about network

congestion.

BECN BECN (backward explicit congestion notification) warns senders about network

congestion.

DE DE (discard eligibility) indicates whether frames can be discarded if the network is

congested.

DATA Control information or encapsulated data goes in this field.

FCS FCS (FRAME CHECK SEQUENCE) is a checksum used for error detection.

FLAG This flag field holds the “End of frame” marker.

1.1.2 Connection setup

The carrier gives you a specific DLCI (Data Link Connection Identifier) for each PVC which is a path

number of a portion of the PVC (the DLCI changes for each hop through the network), not the address of the

destination. It is a logical identifier with local significance only.

A management protocol called LMI (Local Management Interface) provides information about the status of

PVC-to-network access devices. It defines management frames for monitoring the integrity of a link and

whether a link is active or not.

The frame-relay network manages congestion by setting bits in frames that warn end devices that there is

congestion on the network. A bit called FECN (forward explicit congestion notification) is set to notify a

receiving system of congestion and a bit called BECN (backward explicit congestion notification) is set to

notify sending devices of congestion. In the latter case, the sending device will temporarily slow down or

stop transmissions.

1.1.3 Standards

The two main groups that create recommendations and standards in the telecommunications field are ITU – T

(International Telecommunication Union – Telecommunications Standardization Sector) and ANSI

(American National Standards Institute). Standards vary slightly for both organizations, so please select the

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correct standard in the Link Management field. Your Network Service Provider (NSP) should provide you

with this information.

1.2 How To Configure A P153X WAN Port For Frame Relay

Step 1. Go to menu 2 (shown next) and select either WAN Port 1 or 2. This brings you to Menu 2.1.

Frame relay can only be configured for leased synchronous connections.

Figure 4 Menu 2 – WAN Port Setup

Step 2. In Menu 2.1 go to the Connection Type field, press the [SPACEBAR] until it displays

Leased-Sync and then press [ENTER].

Figure 5 Menu 2.1 - Sync/Async WAN Port Setup

Menu 2.1 - Sync/Async WAN Port Setup

Modem Name= FR1

Active= Yes

Connection Type= Leased-Sync

Direction= N/A

Phone Number= N/A

Clock Source= External

Device Type= N/A

Port Speed= 115200

AT Command String:

Init= N/A

Edit Advanced Setup= Yes

Edit Frame Relay Options= Yes

Menu 2 - WAN Port Setup

1. Wan Port 1 (Sync/Async)

2. Wan Port 2 (Sync/Async)

3. Wan Port 3 (Async Only)

Select WAN Port:

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Step 3. Next, move the cursor to the Edit Frame Relay Options= field, press the [SPACEBAR] once

to display Yes and then press [ENTER]. This takes you to Menu 2.1.2 – Frame Relay Setup

shown next.

Figure 6 Menu 2.1.2 – Frame Relay Setup

Table 2 Menu 2.1.2 – Frame Relay Setup

Field Description Options

Link Type Choose User if the Prestige is on the user side of the

UNI (User Network Interface: defines the connection

between user equipment and the Frame Relay

network) and Network if it is on the network side of

the UNI. If your Prestige is connected to a service

provider choose User. If you are using two P153Xs

back-to-back, then one of them must be set to

Network and the other User. Choose None to

disable Frame Relay and run PPP over HDLC on the

leased-sync line.

User (default)

Network

None

Link Management Press the [SPACEBAR] and then [ENTER] to select

which standard is compatible with your Prestige. Both

the Prestige and the peer must use the same

standard. The standard defines functions that are

responsible for monitoring the up/down status and

error performance of an individual link. If failure

occurs, recovery actions are initiated for the

restoration of the failed link.

ITU-T(Q.933A)

ANSI(T1.617D)

Menu 2.1.2 – Frame Relay Setup

Line Type = User

Link Management = ANSI(T1.617D)

Press ENTER to Confirm or ESC to Cancel:

Press Space Bar to Toggle.

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User's Guide Supplement

1.3 How To Configure Frame Relay for Internet Access

1.3.1 Encapsulation

Be sure to use the encapsulation method required by your ISP. The Prestige supports the following methods.

RFC 1973 (PPP over FR)

RFC 1973 describes the use of Frame Relay for framing PPP encapsulated packets. Please refer to RFC 1973

for more information.

RFC 1490

RFC 1490 describes Multiprotocol over Frame Relay encapsulation which is an encapsulation method for

carrying network interconnect traffic (both bridging and routing) over a frame relay backbone. It also

describes a simple fragmentation procedure for carrying large frames over a frame relay network with a

smaller MTU (Maximum Transmission Unit).

1.3.2 DLCI

The carrier gives you a specific DLCI (data link connection identifier) for each PVC which is a path number

of a portion of the PVC (the DLCI changes for each hop through the network), not the address of the

destination. It is a logical identifier with local significance. Identifiers can range from 1 to 991 with

restrictions as shown in the following table. The default DLCI for the Prestige is 16 for the first PVC.

Table 3 Data Link Connection Identifiers

DLCI Usage

0 Channel Signaling

1-15 Reserved

16 – 991 Frame Relay

1.3.3 CIR (Committed Information Rate)

The carrier programs virtual circuits into the network between your sites and charges you for a specific level

of service called the committed information rate (CIR). The CIR is a negotiated rate and is basically a

guarantee that the carrier will always have that bandwidth available. The CIR limit for the Prestige is

256Kbps. The sum of CIRs from all channels in a line cannot exceed 256Kbps due to the processing limit of

the P153X CPU. In field tests, the P153X was found to have a maximum throughput (with Frame Relay) of

roughly 180Kbps.

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1.3.4 EIR (Excess Information Rate)

This is the burst capability of the connection, i.e., the maximum allowable data transfer rate. EIR must be

greater than or equal to the CIR.

Step 1. Go to Menu 4 – Internet Access Setup, move the cursor to the Connection Type field, press the

[SPACEBAR] until it displays Leased-Sync and then press [ENTER]. Frame relay can only be

configured for leased synchronous connections.

Figure 7 Menu 4 - Internet Access Setup

Step 2. Next, move the cursor to the Edit Frame Relay Options= field, press the [SPACEBAR] once to

display Yes and then press [ENTER]. This takes you to Menu 4.2 – Internet Setup Frame

Relay Options shown next.

Figure 8 Menu 4.2 – Internet Setup Frame Relay Options

Menu 4 - Internet Access Setup

ISP's Name= ISP

Connection Type= Leased-Sync

Leased Ports= 2

Pri Phone #= N/A

Sec Phone #= N/A

My Login= 1111

My Password= ********

Single User Account= No

IP Addr= N/A

Edit Frame Relay Options= Yes

Edit Script Options= N/A

Device Type= N/A

Nailed-Up Connection= N/A

Multilink= N/A

Idle Timeout= N/A

Press ENTER to Confirm or ESC to Cancel:

Menu 4.2 – Internet Setup Frame Relay Options

Encapsulation= RFC 1490

DLCI = 16

CIR (kbps)= 64

EIR (kbps)= 80

Enter here to CONFIRM or ESC to CANCEL:

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Table 4 Menu 4.2 – Internet Setup Frame Relay Options

Field Description Options/Examples

Encapsulation Be sure to use the encapsulation method required by

your ISP. The Prestige supports the following

methods. See section 1.3.1 for more information.

RFC 1973 (PPP over

FR)

RFC 1490

DLCI Enter the DLCI number required by your ISP. This is

a path number of a portion of the PVC (the DLCI

changes for each hop through the network), not the

address of the destination. The default DLCI for the

Prestige is 16 for the first PVC. See section 1.3.2 for

more information.

CIR (kbps) Enter the CIR as negotiated with your ISP. See

section 1.3.3 for more information.

EIR (kbps) Enter the EIR as negotiated with your ISP. See

section 1.3.4 for more information.

1.4 How To Configure Frame Relay For A Remote Node

Configuring Frame Relay for a remote node is similar to configuring Frame Relay for Internet Access.

Step 1. Go to Menu 11.1 – Remote Node Profile, move the cursor to the Connection Type field, press

the [SPACEBAR] until it displays Leased-Sync and then press [ENTER]. Frame relay can

only be configured for leased synchronous connections.

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Figure 9 Menu 11.1 – Remote Node Profile

Step 2. Next, move the cursor to the Edit Frame Relay Options= field, press the [SPACEBAR] once to

display Yes and then press [ENTER]. This takes you to Menu 11.4 – Remote Node Frame

Relay Options shown next.

Figure 10 Menu 11.4 - Remote Node Frame Relay Options

The fields in this table are the same as described in Table 4 above.

1.5 Status Display For Frame Relay

Menu 24.1 - System Maintenance – Status has been modified to incorporate Frame Relay information. Port

and DLCI numbers are shown for each PVC. CIR is displayed in the Speed field. When frame relay is

deployed, the WAN IP address for each PVC (with the DLCI appended) is displayed in turn in the

corresponding WAN Port IP Addr field. The LAN Packet Which Triggered Last Call field has been

Menu 11.1 – Remote Node Profile

Rem Node Name= rn1 Route= IP

Active= Yes Bridge= No

Connection Type= Leased-Sync

Leased Ports= 1 Edit PPP Options= No

Backup Line Call Direction= Both Rem IP Addr= 192.168.1.1

Device Type= N/A Edit IP/IPX/Bridge= No

Incoming:

Rem Login= 1111 Telco Option:

Rem Password= ******** Edit Frame Relay Options= Yes

Outgoing:

My Login= 2222 Session Options:

My Password= ******** Edit Filter Sets= No

Authen= N/A Idle Timeout(sec)= 300

Primary Phone #= N/A

Secondary Phone #= N/A

Press ENTER to Confirm or ESC to Cancel:

Menu 11.4 - Remote Node Frame Relay Options

Encapsulation= RFC 1490

DLCI = 16

CIR (kbps)= 64

EIR (kbps)= 80

Enter here to CONFIRM or ESC to CANCEL:

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