Dell Force10 S4810P S4810 Configuration Guide, FTOS 8.3.10.1 - Page 1064

www.dell.com | support.dell.com Figure 54-1. Virtual Link Trunking Management Network Backup Link S4810 Chassis VLT Domain Backup Link S4810 Chassis Virtual Link Trunk Interconnect Virtual Link Trunk Switch or Server that supports LACP (802.1ad) VLT peer devices have independent management planes. A chassis interconnect trunk between the VLT chassis maintains synchronization of L2/L3 control planes across the two VLT peers. The chassis interconnect trunk uses 10GE or 40GE user ports on the chassis. A separate backup link maintains heartbeat messages across an out-of-band management network. The backup link ensures that node failure conditions are correctly detected and are not confused with failures of the chassis interconnect trunk. VLT ensures that local traffic on a chassis does not traverse the chassis interconnect trunk and takes the shortest path to the destination via directly attached links. Virtual link trunking offers the following benefits: • Allows a single device to use a LAG across two upstream devices • Provides a loop-free topology • Uses all available uplink bandwidth • Provides fast convergence if either the link or a device fails • Optimized forwarding with VRRP • Provides link-level resiliency • Assures high availability 1064 | Virtual Link Trunking (VLT)