Do routes still exist after an interface becomes Down on an AR


Scenario: In PPPoE scenarios, if a physical interface of an AR becomes Down, while the dialer interfaces are still Up, do routes still exist?

Solution: Run the dialer number dial-number autodial command on a dialer interface to configure the interface to automatically initiate a dialup. If a physical interface is Down, the dialer interface cannot initiate a PPPoE dialup. As a result, the dialer interface becomes Down, and related routes do not exist.
<Huawei> system-view 
[Huawei]interface Dialer 0 
 [Huawei-Dialer0] dialer number 1234 autodial
1. In interface dialer x, x indicates the ID of the dialer interface for initiating a dialup.
2. In dialer number 1234 autodial,
1234 indicates the dialer number on an interface for calling the remote end, which can be any value.

Other related questions:
After G0/0/0 goes Down, the static route still exists, causing abnormal communication
Root cause: Through confirmation, the device configuration is correct and the system software runs stably. Check the routing table. The outbound interface in the static route is still G0/0/1 based on the direct route and dynamic route. As a result, the static route still exists. Data forwarding is affected. Solution: G0/0/1 is added to the static route forcibly. When G0/0/0 goes Down, the direct route does not exist. Then the static route does not exist. For details, see After G/0/00 on an AR Router Goes Down, Its Static Route Still Exists, Causing Abnormal Communication.

Why is the interface still in Down state after I create an MFR interface and configure the PVC and IP address on the interface
The following conditions must be met for a multilink frame relay (MFR) interface to be in the Up state: 1. The MFR interface must work in data circuit-terminating equipment (DCE) mode. You can run the fr interface-type dce command to change the MFR interface type to DCE. 2. The MFR interface must be bound to a physical interface. Run the link-protocol fr mfr interface-number command to bind an interface to the MFR interface.

After an interface on a CE switch becomes Up during the aging time, will the switch still detect MAC address flapping during the remaining aging time
The default aging time of flapped MAC addresses is 300 seconds. You can run the error-down auto-recovery cause mac-address-flapping interval interval-value command to configure it. After the command is executed, if MAC address flapping stops and the interface becomes Up after the delay, the CE switch no longer detects MAC address flapping during the remaining aging time. This is because the aging time does not expire. If detection on MAC address flapping is required, it is recommended that the delay for an interface to automatically become Up be set greater than the aging time of flapped MAC addresses.

Does the VU switchboard still exist after the U1900 upgrade?
The VU switchboard still exists after the U1900 upgrade and the configuration is not affected by the upgrade. It is recommended that you save and back up the system configuration before the upgrade.

If you have more questions, you can seek help from following ways:
To iKnow To Live Chat
Scroll to top