Cisco N7K-C7010 Configuration Guide - Page 34

Information About the Basic Interface Parameters Chapter 2 Configuring Basic Interface Parameters Send document comments to [email protected] Carrier Delay Note You can configure the carrier delay timer only on VLAN network interfaces. It does not apply for physical ethernet interfaces , port channels and loopback interfaces. See Chapter 4, "Configuring Layer 3 Interfaces," for information on configuring VLAN network interfaces. If a link goes down and comes back up before the carrier delay timer expires, the down state is effectively filtered, and the rest of the software on the device is not aware that a link-down event occurred. A large carrier delay timer results in fewer link-up/link-down events being detected. When you set the carrier delay time to 0, the device detects each link-up/link-down event that occurs. In most environments, a lower carrier delay time is better than a higher one. The exact value that you choose depends on the nature of the link outages and how long you expect these linkages to last in your network. If your data links are subject to short outages (especially if those outages last less time than it takes for your IP routing to converge), you should set a long carrier delay value to prevent these short outages from causing unnecessary problems in your routing tables. However, if your outages tend to be longer, then you may want to set a shorter carrier delay time so that the outages are detected sooner, and the IP route convergence begins and ends sooner. The default carrier-delay time is 2 seconds or 50 milliseconds. Port-Channel Parameters A port channel is an aggregation of physical interfaces that comprise a logical interface. You can bundle up to eight individual interfaces into a port channel to provide increased bandwidth and redundancy. Port channeling also load balances traffic across these physical interfaces. The port channel stays operational if at least one physical interface within the port channel is operational. You can create a Layer 2 port channel by bundling compatible Layer 2 interfaces, or you can create Layer 3 port channels by bundling compatible Layer 3 interfaces. You cannot combine Layer 2 and Layer 3 interfaces in the same port channel. Any configuration changes that you apply to the port channel are applied to each interface member of that port channel. For information on port channels and for information on configuring port channels, see Chapter 6, "Configuring Port Channels." Port Profiles Beginning with Cisco NX-OS Release 4.2(1) for the Cisco Nexus 7000 Series devices, you can create a port profile that contains many interface commands and apply that port profile to a range of interfaces. Each port profile can be applied only to a specific type of interface; the choices are as follows: • Ethernet • VLAN network interface • Loopback • Port channel • Tunnel 2-10 Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x OL-23435-03