Configuring Bandwidth on Demand (Optional)

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

1. In the configuration editor hierarchy, select Configuration>View and Edit>Edit Configuration.
2. Next to Interfaces, click Edit.
3. Next to dl0, click Edit.

From the top of the configuration hierarchy, 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, 4085551515. You can configure a maximum of 15 dial strings per dialer interface.
• Idle timeout—Time a connection is idle before disconnecting—for example, 300. Default value is 120 seconds with a range from 0 to 4294967295.
• Load interval—Interval of time between average network load calculations—for example, 90. Default value is 60 seconds with a range of 20-180 seconds incremented in 10 seconds.
• Load threshold—Percentage of load on all links—for example 95. Default value is 100 with a range from 0 to 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 4085551515 and click OK.
4. In the Idle timeout box, type 300.
5. In the Load interval box, type 90.
6. In the Load threshold box, type 95.
7. In the Pool box, type bw-pool.
8. Click OK.

1. Enter

   edit unit 0

2. Enter

   edit dialer-options

3. Enter

   set dial-string 4085551515

4. Enter

   set idle-timeout 300

5. Enter

   set load-interval 90

6. Enter

   set load-threshold 95

7. 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 is the 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 top of the configuration hierarchy, 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) 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 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. 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 Configuration page.

From the top of the configuration hierarchy, 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. Next to Interfaces, click Edit.
2. In the interface name box, click dl0.
3. In the Interface unit number box, click 0.

From the top of the configuration hierarchy, 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. In the Access profile box, type bw-profile.
4. 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:

• 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 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 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

Navigate to the Interfaces level in the configuration hierarchy, and select an ISDN physical interface—for example, br-1/0/3.

1. In the configuration editor hierarchy, select Configuration>View and Edit>Edit Configuration.
2. Next to Interfaces, click Edit.
3. Under Interface name, click br-1/0/3.

From the top of the configuration hierarchy, enter

edit interfaces br-1/0/3

Configure dialer options for each ISDN interface by following the instructions in Table 55.

Each ISDN interface must have the same pool identifier to participate in bandwidth on demand. Therefore, the dialer pool name bw-pool, for the dialer interface configured in Table 55, is used when configuring the ISDN interface.

You can group up to four br interfaces together when configuring bandwidth on demand with a total of eight B-channels providing connectivity.

1. Next to Dialer options, click Dialer options.
2. Next to Pool, click Add new entry.
3. In the Pool identifier box, type the name of the dialer pool—for example, bw-pool.
4. Click OK.

Enter

set dialer-options pool bw-pool