Service Manual

Virtual Link Trunking (VLT)
VLT allows physical links between two chassis to appear as a single virtual link to the network core.
VLT eliminates the requirement for Spanning Tree protocols by allowing link aggregation group (LAG) terminations on two separate
distribution or core switches, and by supporting a loop-free topology. VLT provides Layer 2 multipathing, creating redundancy through
increased bandwidth and enabling multiple parallel paths between nodes and load-balancing traffic where alternative paths exist.
Prerequisites: Before you configure VLT, ensure both VLT peer switches are running the same Dell Networking Operating System (OS)
version and are configured for rapid spanning tree protocol (RSTP) as described in the Virtual Link Trunking (VLT) chapter in the Dell
Networking OS Configuration Guide.
Topics:
• back-up destination
• clear ip mroute
• clear ip pim tib
• delay-restore abort-threshold
• lacp ungroup member-independent vlt
• multicast peer-routing timeout
• peer-link port-channel
• peer-routing
• peer-routing-timeout
• primary-priority
• show ip mroute
• show vlt backup-link
• show vlt brief
• show vlt detail
• show vlt inconsistency
• show vlt mismatch
• show vlt role
• show vlt statistics
• system-mac
• unit-id
• vlt domain
• vlt-peer-lag port-channel
• show vlt private-vlan
back-up destination
Configure the IP address of the management interface on the remote VLT peer to be used as the endpoint of the VLT backup link for
sending out-of-band hello messages.
Syntax
back-up destination ip-address [interval seconds]}
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