Here are the steps to edit or set bandwidth in a Juniper router:

1. Open the configuration mode: Log in to the Juniper router and enter configuration mode by typing the following command:

configure

2. Set the bandwidth limit on an interface: To set the bandwidth limit on an interface, use the following command:

set interfaces [interface-name] unit [unit-number] family inet tctrl bandwidth [bandwidth-limit]

In the above command, replace [interface-name] with the name of the interface, [unit-number] with the unit number of the interface, and [bandwidth-limit] with the maximum bandwidth limit in kilobits per second (Kbps).

3. Set the bandwidth limit on a traffic flow: To set the bandwidth limit on a traffic flow, use the following command:

set firewall policer [policer-name] if-exceeding bandwidth-limit [bandwidth-limit]

In the above command, replace [policer-name] with a name for the policer and [bandwidth-limit] with the maximum bandwidth limit in Kbps.

4. Apply the bandwidth limit: To apply the bandwidth limit, you must apply the policer to the interface. Use the following command to apply the policer to an interface:

set interfaces [interface-name] unit [unit-number] family inet filter input [policer-name]

In the above command, replace [interface-name] with the name of the interface, [unit-number] with the unit number of the interface, and [policer-name] with the name of the policer that you created in step 3.

5. Commit the configuration: To apply the configuration changes, type the following command:

commit

With these commands, you have edited or set bandwidth in a Juniper router using the tctrl feature. Keep in mind that bandwidth limits should be set carefully to ensure that there is enough bandwidth available for critical applications and services.

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