Service Manual
58 Virtual Link Trunking (VLT)........................................................................................796
Overview........................................................................................................................................................................796
VLT on Core Switches.............................................................................................................................................. 797
Enhanced VLT.......................................................................................................................................................... 797
VLT Terminology.............................................................................................................................................................798
Congure Virtual Link Trunking.......................................................................................................................................798
Important Points to Remember................................................................................................................................ 798
Conguration Notes.................................................................................................................................................800
Primary and Secondary VLT Peers...........................................................................................................................802
RSTP and VLT..........................................................................................................................................................803
VLT Bandwidth Monitoring.......................................................................................................................................803
VLT and Stacking..................................................................................................................................................... 803
VLT and IGMP Snooping..........................................................................................................................................803
VLT IPv6.................................................................................................................................................................. 804
VLT Port Delayed Restoration.................................................................................................................................. 804
PIM-Sparse Mode Support on VLT.......................................................................................................................... 804
VLT Routing ............................................................................................................................................................ 806
Non-VLT ARP Sync..................................................................................................................................................808
RSTP Conguration....................................................................................................................................................... 808
Preventing Forwarding Loops in a VLT Domain........................................................................................................ 808
Sample RSTP Conguration.....................................................................................................................................808
Conguring VLT....................................................................................................................................................... 809
PVST+ Conguration...................................................................................................................................................... 819
Sample PVST+ Conguration....................................................................................................................................819
eVLT Conguration Example.......................................................................................................................................... 820
eVLT Conguration Step Examples.......................................................................................................................... 820
PIM-Sparse Mode Conguration Example......................................................................................................................822
Verifying a VLT Conguration.........................................................................................................................................823
Additional VLT Sample Congurations............................................................................................................................826
Conguring Virtual Link Trunking (VLT Peer 1)Conguring Virtual Link Trunking (VLT Peer 2)Verifying a Port-
Channel Connection to a VLT Domain (From an Attached Access Switch).............................................................. 826
Troubleshooting VLT.......................................................................................................................................................828
Reconguring Stacked Switches as VLT........................................................................................................................ 829
Specifying VLT Nodes in a PVLAN.................................................................................................................................829
Association of VLTi as a Member of a PVLAN..........................................................................................................830
MAC Synchronization for VLT Nodes in a PVLAN....................................................................................................830
PVLAN Operations When One VLT Peer is Down..................................................................................................... 831
PVLAN Operations When a VLT Peer is Restarted....................................................................................................831
Interoperation of VLT Nodes in a PVLAN with ARP Requests...................................................................................831
Scenarios for VLAN Membership and MAC Synchronization With VLT Nodes in PVLAN......................................... 831
Conguring a VLT VLAN or LAG in a PVLAN................................................................................................................. 833
Creating a VLT LAG or a VLT VLAN......................................................................................................................... 833
Associating the VLT LAG or VLT VLAN in a PVLAN................................................................................................. 834
Proxy ARP Capability on VLT Peer Nodes......................................................................................................................835
Working of Proxy ARP for VLT Peer Nodes..............................................................................................................835
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