Concept Guide

VLT Terminology....................................................................................................................................................... 951
Layer-2 Trac in VLT Domains...............................................................................................................................952
Interspersed VLANs................................................................................................................................................ 953
VLT on Core Switches.............................................................................................................................................953
Enhanced VLT..........................................................................................................................................................954
Congure Virtual Link Trunking....................................................................................................................................955
Important Points to Remember............................................................................................................................. 955
Conguration Notes................................................................................................................................................ 956
Primary and Secondary VLT Peers........................................................................................................................959
RSTP and VLT..........................................................................................................................................................960
VLT Bandwidth Monitoring.....................................................................................................................................960
VLT and Stacking.....................................................................................................................................................960
VLT and IGMP Snooping........................................................................................................................................ 960
VLT IPv6.................................................................................................................................................................... 961
VLT Port Delayed Restoration.................................................................................................................................961
PIM-Sparse Mode Support on VLT........................................................................................................................961
VLT Routing .............................................................................................................................................................963
Non-VLT ARP Sync................................................................................................................................................. 966
RSTP Conguration.......................................................................................................................................................967
Preventing Forwarding Loops in a VLT Domain................................................................................................... 967
Sample RSTP conguration....................................................................................................................................967
Conguring VLT....................................................................................................................................................... 968
PVST+ Conguration.....................................................................................................................................................978
Sample PVST+ Conguration.................................................................................................................................979
Peer Routing Conguration Example.......................................................................................................................... 979
Dell-1 Switch Conguration.................................................................................................................................... 980
Dell-2 Switch Conguration....................................................................................................................................984
R1 Conguration.......................................................................................................................................................987
Access Switch A1 Congurations and Verication.............................................................................................. 988
eVLT Conguration Example........................................................................................................................................989
eVLT Conguration Step Examples.......................................................................................................................989
PIM-Sparse Mode Conguration Example..................................................................................................................991
Verifying a VLT Conguration...................................................................................................................................... 992
Additional VLT Sample Congurations........................................................................................................................995
Troubleshooting VLT...................................................................................................................................................... 997
Reconguring Stacked Switches as VLT....................................................................................................................998
Specifying VLT Nodes in a PVLAN..............................................................................................................................998
Association of VLTi as a Member of a PVLAN.................................................................................................... 999
MAC Synchronization for VLT Nodes in a PVLAN..............................................................................................999
PVLAN Operations When One VLT Peer is Down.............................................................................................1000
PVLAN Operations When a VLT Peer is Restarted........................................................................................... 1000
Interoperation of VLT Nodes in a PVLAN with ARP Requests........................................................................ 1000
Scenarios for VLAN Membership and MAC Synchronization With VLT Nodes in PVLAN.......................... 1000
Conguring a VLT VLAN or LAG in a PVLAN...........................................................................................................1002
Creating a VLT LAG or a VLT VLAN.................................................................................................................... 1002
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