Install Guide

Table Of Contents
Chapter 59: Virtual Link Trunking (VLT).................................................................................... 933
Overview...........................................................................................................................................................................933
VLT Terminology....................................................................................................................................................... 935
Layer-2 Traffic in VLT Domains.............................................................................................................................936
Interspersed VLANs..................................................................................................................................................937
VLT on Core Switches............................................................................................................................................. 937
Enhanced VLT............................................................................................................................................................938
Configure Virtual Link Trunking...................................................................................................................................939
Important Points to Remember............................................................................................................................. 939
Configuration Notes................................................................................................................................................. 940
Primary and Secondary VLT Peers....................................................................................................................... 943
RSTP and VLT........................................................................................................................................................... 943
VLT Bandwidth Monitoring.....................................................................................................................................944
VLT and Stacking...................................................................................................................................................... 944
VLT and IGMP Snooping......................................................................................................................................... 944
VLT IPv6......................................................................................................................................................................944
VLT Port Delayed Restoration............................................................................................................................... 945
PIM-Sparse Mode Support on VLT...................................................................................................................... 945
VLT Routing ...............................................................................................................................................................947
Non-VLT ARP Sync..................................................................................................................................................950
RSTP Configuration....................................................................................................................................................... 950
Preventing Forwarding Loops in a VLT Domain................................................................................................ 950
Sample RSTP configuration.................................................................................................................................... 951
Configuring VLT......................................................................................................................................................... 951
PVST+ Configuration.....................................................................................................................................................960
Peer Routing Configuration Example..........................................................................................................................961
Dell-1 Switch Configuration.................................................................................................................................... 962
Dell-2 Switch Configuration................................................................................................................................... 965
R1 Configuration........................................................................................................................................................968
Access Switch A1 Configurations and Verification........................................................................................... 969
eVLT Configuration Example........................................................................................................................................970
PIM-Sparse Mode Configuration Example................................................................................................................972
Verifying a VLT Configuration......................................................................................................................................973
Additional VLT Sample Configurations...................................................................................................................... 976
Troubleshooting VLT...................................................................................................................................................... 977
Reconfiguring Stacked Switches as VLT.................................................................................................................. 979
Specifying VLT Nodes in a PVLAN............................................................................................................................. 979
Configuring a VLT VLAN or LAG in a PVLAN.......................................................................................................... 982
Creating a VLT LAG or a VLT VLAN.................................................................................................................... 982
Associating the VLT LAG or VLT VLAN in a PVLAN........................................................................................983
Proxy ARP Capability on VLT Peer Nodes................................................................................................................984
VLT Nodes as Rendezvous Points for Multicast Resiliency.................................................................................985
Configuring VLAN-Stack over VLT............................................................................................................................ 985
IPv6 Peer Routing in VLT Domains Overview..........................................................................................................988
Configure BFD in VLT Domain..................................................................................................................................... 993
Sample BFD configuration in VLT domain...........................................................................................................993
VXLAN on VLT................................................................................................................................................................ 996
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