Cisco IOS Wide-Area Networking Configuration Guide - Free Books

Configuring Frame Relay Traffic ShapingConfiguring Frame RelayFigure 24Connectivity Detection Using ELMI Address RegistrationNetworkManagementSystemEthernet42886CiscorouterCiscoswitchCiscoswitchCiscorouterELMI address registration linksELMI address registration takes place on all interfaces on which ELMI is enabled, even if all theinterfaces are connected to the same router or switch. The router periodically sends a version inquirymessage with version information, the management IP address, and ifIndex to the switch. The switchsends its management IP address and ifIndex using the version status message. When the managementIP address of the switch changes, an asynchronous ELMI version status message is immediately sent tothe neighboring device.NoteThe ELMI address registration mechanism does not check for duplicate or illegal addresses.When ELMI is enabled, the router automatically chooses the IP address of one of the interfaces to usefor ELMI address registration purposes. The router will choose the IP address of an Ethernet interfacefirst, and then serial and other interfaces. You have the option to use the IP address chosen by the routeror to disable the autoaddress mechanism and configure the management IP address yourself. You canalso choose to disable ELMI address registration on a specific interface or on all interfaces.To configure ELMI, complete the tasks in the following sections:• Enabling ELMI (Required)• Disabling Automatic IP Address Selection (Optional)• Configuring the IP Address to Be Used for ELMI Address Registration (Optional)• Enabling ELMI Address Registration on an Interface (Optional)• Verifying ELMI Address Registration (Optional)For examples of the configurations in this section, see the section “ELMI Configuration Examples” atthe end of this chapter.Enabling ELMITo enable ELMI, use the following commands beginning in interface configuration mode:16