Users Guide

Chapter 58: Virtual Link Trunking (VLT)....................................................................................909
Overview...........................................................................................................................................................................909
VLT Terminology.........................................................................................................................................................911
Layer-2 Traffic in VLT Domains............................................................................................................................. 912
Interspersed VLANs.................................................................................................................................................. 913
VLT on Core Switches..............................................................................................................................................913
Enhanced VLT.............................................................................................................................................................914
Configure Virtual Link Trunking....................................................................................................................................915
Important Points to Remember..............................................................................................................................915
Configuration Notes.................................................................................................................................................. 917
Primary and Secondary VLT Peers........................................................................................................................919
RSTP and VLT........................................................................................................................................................... 920
VLT Bandwidth Monitoring.....................................................................................................................................920
VLT and Stacking......................................................................................................................................................920
VLT and IGMP Snooping..........................................................................................................................................921
VLT IPv6...................................................................................................................................................................... 921
VLT Port Delayed Restoration................................................................................................................................921
PIM-Sparse Mode Support on VLT....................................................................................................................... 921
VLT Routing .............................................................................................................................................................. 923
Non-VLT ARP Sync.................................................................................................................................................. 926
RSTP Configuration........................................................................................................................................................926
Preventing Forwarding Loops in a VLT Domain................................................................................................ 926
Sample RSTP configuration....................................................................................................................................927
Configuring VLT.........................................................................................................................................................927
PVST+ Configuration.....................................................................................................................................................936
Peer Routing Configuration Example......................................................................................................................... 937
Dell-1 Switch Configuration.................................................................................................................................... 938
Dell-2 Switch Configuration.................................................................................................................................... 941
R1 Configuration........................................................................................................................................................ 944
Access Switch A1 Configurations and Verification........................................................................................... 945
eVLT Configuration Example........................................................................................................................................946
PIM-Sparse Mode Configuration Example................................................................................................................948
Verifying a VLT Configuration..................................................................................................................................... 949
Additional VLT Sample Configurations...................................................................................................................... 952
Troubleshooting VLT......................................................................................................................................................953
Reconfiguring Stacked Switches as VLT..................................................................................................................955
Specifying VLT Nodes in a PVLAN.............................................................................................................................955
Configuring a VLT VLAN or LAG in a PVLAN.......................................................................................................... 958
Creating a VLT LAG or a VLT VLAN.................................................................................................................... 958
Associating the VLT LAG or VLT VLAN in a PVLAN........................................................................................959
Proxy ARP Capability on VLT Peer Nodes................................................................................................................960
VLT Nodes as Rendezvous Points for Multicast Resiliency..................................................................................961
Configuring VLAN-Stack over VLT............................................................................................................................. 961
IPv6 Peer Routing in VLT Domains Overview..........................................................................................................964
Configure BFD in VLT Domain.....................................................................................................................................969
Sample BFD configuration in VLT domain...........................................................................................................969
Chapter 59: VLT Proxy Gateway................................................................................................ 973
Contents
27