Configuring an ISDN BRI interface to be in permanent active state on physical layer
This function is available only on the BSV card's network-side BRI interfaces.
On a BRI interface operating on the network side, the T325 timer is triggered when the link is torn down on data link layer and deactivating requests are sent from data link layer to physical layer when the timer expires. Deactivating request cause the BRI interface to turn to inactive mode on physical layer and helps reduce power consumption. To make a BRI interface remain in the active state on physical layer even if no link exists on the data link layer, you can perform the operations listed in the following table, through which you can disable activating request sending.
This function is different from the permanent link function. The former maintains the active state of BRI interfaces on physical layer and is only applicable to BRI interfaces operating on the network side. It cannot activate the BRI interfaces that are in inactive state on physical layer. The latter, however, enables BRI interfaces to enter Q.921 multi-framing state immediately after the user side and the network side are connected correctly. It is only applicable to BRI interfaces operating on the user side. If you enable the permanent link function when no Q.921 link is established, the system attempts to establish Q.921 links.
To configure an ISDN BRI interface to be in permanent active state on physical layer:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter BRI interface view. | interface bri interface-number | N/A |
3. Configure the BRI interface to be in permanent active state on physical layer. | permanent-active | Optional. By default, a BRI interface is not in permanent active state on physical layer. |