Configuring Dialer Interfaces for Bandwidth on Demand

Navigate to the Interfaces level in the configuration hierarchy, and select a dialer interface—for example, dl0.

1. In the J-Web interface, select Configuration>View and Edit>Edit Configuration.
2. Next to Interfaces, click Edit.
3. Next to dl0, click Edit.

From the [edit] hierarchy level, enter

edit interfaces dl0

Configure multilink properties on the dialer interface.

1. Select multilink-ppp as the encapsulation type.

Enter

set encapsulation multilink-ppp

Configure the dialer options.

• Dial string—Telephone number for the interface to dial that establishes ISDN connectivity—for example, 4085550115. You can configure a maximum of 15 dial strings per dialer interface.
• Load interval—Interval of time used to calculate the average load on the dialer interface—for example, 90. Default value is 60 seconds with a range of 20-180 seconds. The value must be a multiple of 10.
• Load threshold—Threshold above which an additional ISDN interface is activated, specified as a percentage of the cumulative load of all UP links—for example 95. Default value is 100 with a range of 0–100.
• Pool—Name of a group of ISDN interfaces configured to use the dialer interface—for example, bw-pool.

1. In the Unit section, click Dialer options under Encapsulation.
2. Next to Dial string, click Add new entry.
3. In the Value box, type 4085550115 and click OK.
4. In the Load interval box, type 90.
5. In the Load threshold box, type 95.
6. In the Pool box, type bw-pool.
7. Click OK.

1. Enter

   edit unit 0

2. Enter

   edit dialer-options

3. Enter

   set dial-string 4085550115

4. Enter

   set load-interval 90

5. Enter

   set load-threshold 95

6. Enter

   set pool bw-pool

Configure unit properties.

To configure multiple dialer interfaces for bandwidth-on-demand, increment the unit number—for example, dl0.1, dl0.2, and so on.

F max period—Maximum number of compressed packets allowed between the transmission of full packets—for example, 100. The value can be between 1 and 65535.

1. Next to Compression, select Yes, and then click Configure.
2. Select Rtp, and then click Configure.
3. In the F max period box, type 100.
4. Next to Queues, click Add new entry.
5. From the Value list, select q3.
6. Click OK until you return to the Unit page.

1. From the [edit] hierarchy level, enter

   edit interfaces dl0 unit 0

2. Enter

   set compression rtp f-max-period 500 queues q3

Configure logical properties.

• Fragment threshold–Maximum size, in bytes, for multilink packet fragments. The value can be between 128 and 16320 bytes, for example, 1024. The default is 0 bytes (no fragmentation). Any nonzero value must be a multiple of 64 bytes.
• Maximum received reconstructed unit (MRRU)—This value is expressed as a number between 1500 and 4500 bytes—for example, 1500.

1. In the Fragment threshold box, type 1024.
2. In the Mrru box, type 1500.
3. Click OK until you return to the main Configuration page.

1. Enter

   set fragment-threshold 1024

2. Enter

   set mrru 1500

Define a CHAP access profile with a client and a secret password. For example, define bw–profile with client 1 and password my-secret.

1. On the main Configuration page next to Access, click Configure or Edit.
2. Next to Profile, click Add new entry.
3. In the Profile name box, type bw-profile.
4. Next to Client, click Add new entry.
5. In the Name box, type client1.
6. In the Chap secret box, type my-secret.
7. Click OK until you return to the main Configuration page.

From the [edit] hierarchy level, enter

set access profile bw-profile client client1 chap-secret my-secret

Navigate to the appropriate dialer interface level in the configuration hierarchy—for example, dl0 unit 0.

1. On the main Configuration page next to Interfaces, click Configure or Edit.
2. In the interface name box, click dl0.
3. In the Interface unit number box, click 0.

From the [edit] hierarchy level, enter

edit interfaces dl0 unit 0

Configure CHAP on the dialer interface and specify a unique profile name containing a client list and access parameters—for example, bw-profile.

1. Next to Ppp options, click Configure.
2. Next to Chap, click Configure.
3. Next to Access data, select Access profile.
4. In the Access profile box, type bw-profile.
5. Click OK.

Enter

set ppp-options chap access-profile bw-profile

Configure packet compression.

You can configure the following compression types:

• ACFC (address and control field compression)—Conserves bandwidth by compressing the address and control fields of PPP-encapsulated packets.
• PFC (protocol field compression)—Conserves bandwidth by compressing the protocol field of a PPP-encapsulated packet.

1. Under Compression, select Acfc.
2. Click OK until you return to the Unit page.

Enter

set ppp-options compression acfc

Configure the dialer interface to be assigned an IP address in one of the following ways:

• Assign source and destination IP addresses as described in Table 54—for example, 172.20.10.2 and 172.20.10.1. (The destination IP address is optional.)
• Obtain an IP address by negotiation with the remote end. This method might require the access concentrator to use a RADIUS authentication server.
• Derive the source address from a specified interface—for example, the loopback interface, lo0.0—and assign a destination address—for example, 192.168.1.2. The specified interface must include a logical unit number and have a configured IP address.

Next to Inet, select Yes and click Configure.

Select one of the following IP address configurations:

To assign source and destination IP addresses:

1. Next to Address, click Add new entry.
2. In the Source box, type 172.20.10.2.
3. In the Destination box, type 172.20.10.1.
4. Click OK.

To obtain an IP address from the remote end:

1. Next to Negotiate address, select the Yes check box.
2. Click OK.

To derive the source address and assign the destination address:

1. Next to Unnumbered address, select the Yes check box and click Configure.
2. In the Destination box, type 192.168.1.2.
3. In the Source box, type lo0.0.
4. Click OK.

Do one of the following:

• To assign source and destination IP addresses, enter

  set family inet address 172.20.10.2 destination 172.20.10.1

• To obtain an IP address from the remote end, enter

  set family inet negotiate-address

• To derive the source address and assign the destination address, enter

  set family inet unnumbered-address lo0.0 destination 192.168.1.2