Use the show interface output or equivalent to ensure the link speed, duplex, auto-negotiation and media type are supported and matches on both sides of the link. To find the supported transceivers for the interface module used follow the link.Ĭisco Gigabit Ethernet Transceiver Modules Compatibility MatrixĬonfigure the interface in local loopback Interface link parameters must match at both ends of the link This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. Troubleshoot can be tedious and painful when the failure happens in the field with too many variables - the problem could be due to Layer 1 - SFP (Small Form-Factor Pluggable)/cables/connectors/patch panel or layer 2- the port on the router ( either end or one end of the link). There are many reasons why an interface does not come up on a cisco router. Refer to Cisco Technical Tips Conventions for more information on document conventions. This document describes troubleshoot methodology for interface down scenario on ethernet links.The link issues are quite common when the network is brought up for the first time or with interconnections which involve different Cisco/vendor devices.Ĭisco recommends that you have knowledge of these topics:
0 kommentar(er)
