Dell Force10 Z9000 FTOS Configuration Guide for Z9000 System - Page 532

www.dell.com | support.dell.com Figure 24-7. Configuring Redundant Layer 2 Pairs without Spanning Tree Redundant links create a switching loop. Without STP broadcast storms occurs. Use backup interfaces to create redundant links in networks without STP FTOS(conf-if-gi-3/41)#switchport FTOS(conf-if-gi-3/41)#switchport backup gi 3/42 FTOS(conf-if-gi-3/41)#no shutdown R3 3/41 FTOS(conf-if-gi-4/31)#switchport FTOS(conf-if-gi-4/31)#no shutdown R4 4/31 FTOS(conf-if-gi-3/42)#switchport FTOS(conf-if-gi-3/42)#no shutdown Backup Link 3/42 4/32 FTOS(conf-if-gi-4/32)#switchport FTOS(conf-if-gi-4/32)#no shutdown fnC0067mp You configure a redundant pair by assigning a backup interface to a primary interface with the switchport backup interface command. Initially, the primary interface is active and transmits traffic and the backup interface remains down. If the primary fails for any reason, the backup transitions to an active UP state. If the primary interface fails and later comes back up, it remains as the backup interface for the redundant pair. FTOS supports only Gigabit, 10-Gigabit, and 40-Gigabit ports and port channels as primary/backup interfaces in redundant pairs. (A port channel is also referred to as a Link Aggregation Group (LAG). See Port Channel Interfaces for more information.) If the interface is a member link of a LAG, the following primary/backup interfaces are also supported: • primary interface is a physical interface, the backup interface can be a physical interface • primary interface is a physical interface, the backup interface can be a static or dynamic LAG • primary interface is a static or dynamic LAG, the backup interface can be a physical interface • primary interface is a static or dynamic LAG, the backup interface can be a static or dynamic LAG In a redundant pair, any combination of physical and port-channel interfaces is supported as the two interfaces in a redundant pair. For example, you can configure a static (without LACP) or dynamic (with LACP) port-channel interface as either the primary or backup link in a redundant pair with a physical interface. To ensure that existing network applications see no difference when a primary interface in a redundant pair transitions to the backup interface, be sure to apply identical configurations of other traffic parameters to each interface. If you remove an interface in a redundant link (remove the line card of a physical interface or delete a port channel with the no interface port-channel command), the redundant pair configuration is also removed. 532 | Layer 2