Router loopback how to#
Router loopback software#
Router loopback series#

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. The vpi and vci arguments cannot both be set to 0 if one is 0, the other cannot be 0.The VCI value is unique only on a single link, not throughout the ATM network, because it has only local significance. The VCI is a 16-bit field in the header of the ATM cell.

Typically, lower values from 0 to 31 are reserved for specific traffic (for example, F4 OAM, switched virtual circuit (SVC) signaling, and Interim Local Management Interface (ILMI)) and should not be used. This value ranges from 0 to 1 less than the maximum value set for this interface by the atm vc-per-vp command.

The vci argument specifies the ATM network virtual channel identifier (VCI) for this PVC.

The absence of the slash (/) and a VPI value causes the VPI value to default to 0.

The vpi argument specifies the ATM network virtual path identifier (VPI) for this PVC.

oam-pvc manage loop-detectionĬreates an ATM PVC and enters ATM permanent virtual circuit configuration mode. To enable loopback mode detection on an ATM interface, use the following steps.

Enabling ATM OAM Loopback Mode Detection Enabling ATM OAM Loopback Mode Detection.

This section contains the following task:

Router loopback how to#

How to Enable ATM OAM Loopback Mode Detection Benefits of ATM OAM Loopback Mode DetectionĪTM OAM Loopback Mode Detection prevents traffic from being routed on the PVC for as long as any intermediary router is detected as being in loopback mode. This is applicable even for an end router that is in loopback mode. When enabled, the ATM OAM Loopback Mode Detection feature detects an intervening router that is in loopback mode and sets the OAM state to NOT_VERIFIED. However, if an intervening router within the ATM cloud is in loopback mode, the router considers the circuit to be up, when in fact the other end is not reachable. When a PVC traverses an ATM cloud and OAM is enabled, the router sends a loopback cell to the other end and waits for a response to determine whether the circuit is up.

Benefits of ATM OAM Loopback Mode Detection How ATM OAM Loopback Mode Detection Works.

How ATM OAM Loopback Mode Detection Works.

To enable ATM OAM Loopback Mode Detection, you should understand the following concepts: Information About ATM OAM Loopback Mode Detection

Router loopback series#

The ATM OAM Loopback Mode Detection feature is supported only on the Cisco 10000 series routers, Cisco 7200 series routers, and ASR 1000 series routers.The ATM OAM Loopback Mode Detection feature applies only to ATM PVCs.Restrictions for ATM OAM Loopback Mode Detection To use this feature, you should know how to configure and use OAM.

Feature Information for ATM OAM Loopback Mode Detection Prerequisites for ATM OAM Loopback Mode Detection.

Configuration Examples for ATM OAM Loopback Mode Detection.

How to Enable ATM OAM Loopback Mode Detection.

Information About ATM OAM Loopback Mode Detection.

Restrictions for ATM OAM Loopback Mode Detection.

Prerequisites for ATM OAM Loopback Mode Detection.

To access Cisco Feature Navigator, go to.

Router loopback software#

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the 'Feature Information for ATM OAM Loopback Mode Detection' section. For the latest feature information and caveats, see the release notes for your platform and software release. Your software release may not support all the features documented in this module. The PVC is moved back to an UP state when the loopback condition in the peer ATM interface is removed. The impacted permanent virtual circuit (PVC) is moved to a DOWN state, and traffic is suspended, when loopback is detected on an interface where end-to-end F5 Operation, Administration, and Maintenance (OAM) is enabled. The ATM OAM Loopback Mode Detection feature allows the router to automatically detect when a peer ATM interface is in loopback mode.