Service Manual

Enabling Null VLAN as the Default VLAN.................................................................................................................. 941
Chapter 59: Virtual Link Trunking (VLT).................................................................................... 942
Overview...........................................................................................................................................................................942
VLT Terminology....................................................................................................................................................... 944
Layer-2 Traffic in VLT Domains.............................................................................................................................945
Interspersed VLANs..................................................................................................................................................946
VLT on Core Switches............................................................................................................................................. 946
Enhanced VLT............................................................................................................................................................947
Configure Virtual Link Trunking...................................................................................................................................948
Important Points to Remember............................................................................................................................. 948
Configuration Notes.................................................................................................................................................950
Primary and Secondary VLT Peers.......................................................................................................................952
RSTP and VLT........................................................................................................................................................... 953
VLT Bandwidth Monitoring.....................................................................................................................................953
VLT and Stacking......................................................................................................................................................953
VLT and IGMP Snooping.........................................................................................................................................954
VLT IPv6......................................................................................................................................................................954
VLT Port Delayed Restoration............................................................................................................................... 954
PIM-Sparse Mode Support on VLT...................................................................................................................... 954
VLT Routing .............................................................................................................................................................. 956
Non-VLT ARP Sync..................................................................................................................................................959
RSTP Configuration....................................................................................................................................................... 959
Preventing Forwarding Loops in a VLT Domain................................................................................................ 959
Sample RSTP configuration....................................................................................................................................960
Configuring VLT........................................................................................................................................................ 960
PVST+ Configuration.....................................................................................................................................................969
Peer Routing Configuration Example......................................................................................................................... 970
Dell-1 Switch Configuration..................................................................................................................................... 971
Dell-2 Switch Configuration................................................................................................................................... 975
R1 Configuration........................................................................................................................................................ 978
Access Switch A1 Configurations and Verification........................................................................................... 979
eVLT Configuration Example........................................................................................................................................979
PIM-Sparse Mode Configuration Example................................................................................................................982
Verifying a VLT Configuration......................................................................................................................................982
Additional VLT Sample Configurations...................................................................................................................... 985
Troubleshooting VLT...................................................................................................................................................... 987
Reconfiguring Stacked Switches as VLT.................................................................................................................. 988
Specifying VLT Nodes in a PVLAN.............................................................................................................................989
Configuring a VLT VLAN or LAG in a PVLAN.......................................................................................................... 992
Creating a VLT LAG or a VLT VLAN.................................................................................................................... 992
Associating the VLT LAG or VLT VLAN in a PVLAN........................................................................................993
Proxy ARP Capability on VLT Peer Nodes................................................................................................................994
VLT Nodes as Rendezvous Points for Multicast Resiliency.................................................................................995
Configuring VLAN-Stack over VLT............................................................................................................................ 995
IPv6 Peer Routing in VLT Domains Overview..........................................................................................................998
Configure BFD in VLT Domain................................................................................................................................... 1002
Sample BFD configuration in VLT domain.........................................................................................................1002
VXLAN on VLT...............................................................................................................................................................1006
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