Administrator Guide

Overview........................................................................................................................................................................ 890
VLT Terminology.......................................................................................................................................................893
Layer-2 Trac in VLT Domains...............................................................................................................................894
Interspersed VLANs................................................................................................................................................ 895
VLT on Core Switches............................................................................................................................................ 895
Enhanced VLT..........................................................................................................................................................896
Congure Virtual Link Trunking.................................................................................................................................... 897
Important Points to Remember..............................................................................................................................897
Conguration Notes................................................................................................................................................ 898
Primary and Secondary VLT Peers.........................................................................................................................901
RSTP and VLT.......................................................................................................................................................... 901
VLT Bandwidth Monitoring.....................................................................................................................................902
VLT and Stacking.....................................................................................................................................................902
VLT and IGMP Snooping........................................................................................................................................ 902
VLT IPv6................................................................................................................................................................... 902
VLT Port Delayed Restoration................................................................................................................................903
PIM-Sparse Mode Support on VLT.......................................................................................................................903
VLT Routing .............................................................................................................................................................905
Non-VLT ARP Sync................................................................................................................................................. 908
RSTP Conguration...................................................................................................................................................... 909
Preventing Forwarding Loops in a VLT Domain................................................................................................... 909
Sample RSTP Conguration...................................................................................................................................909
Conguring VLT........................................................................................................................................................910
PVST+ Conguration.....................................................................................................................................................920
Sample PVST+ Conguration.................................................................................................................................920
Peer Routing Conguration Example...........................................................................................................................921
Dell-1 Switch Conguration.....................................................................................................................................922
Dell-2 Switch Conguration....................................................................................................................................926
R1 Conguration.......................................................................................................................................................929
Access Switch A1 Congurations and Verication.............................................................................................. 930
eVLT Conguration Example.........................................................................................................................................931
eVLT Conguration Step Examples........................................................................................................................931
PIM-Sparse Mode Conguration Example.................................................................................................................933
Verifying a VLT Conguration.......................................................................................................................................934
Additional VLT Sample Congurations........................................................................................................................ 937
Troubleshooting VLT......................................................................................................................................................939
Reconguring Stacked Switches as VLT....................................................................................................................940
Specifying VLT Nodes in a PVLAN..............................................................................................................................940
Association of VLTi as a Member of a PVLAN..................................................................................................... 941
MAC Synchronization for VLT Nodes in a PVLAN...............................................................................................941
PVLAN Operations When One VLT Peer is Down...............................................................................................942
PVLAN Operations When a VLT Peer is Restarted.............................................................................................942
Interoperation of VLT Nodes in a PVLAN with ARP Requests.......................................................................... 942
Scenarios for VLAN Membership and MAC Synchronization With VLT Nodes in PVLAN............................ 942
Conguring a VLT VLAN or LAG in a PVLAN............................................................................................................ 944
Contents
29