Guidelines for Enabling the VLT Proxy Gateway.......................................................................................................895Enabling the VLT Proxy Gateway............................................................................................................................. 896LLDP Organizational TLV for Proxy Gateway........................................................................................................... 896Configuring an LLDP VLT Proxy Gateway...................................................................................................................... 898Configuring a Static VLT Proxy Gateway........................................................................................................................89862 Virtual Link Trunking (VLT)........................................................................................900Overview....................................................................................................................................................................... 900VLT on Core Switches.............................................................................................................................................. 901Enhanced VLT.......................................................................................................................................................... 901VLT Terminology.............................................................................................................................................................902Configure Virtual Link Trunking.......................................................................................................................................902Important Points to Remember................................................................................................................................ 902Configuration Notes.................................................................................................................................................904Primary and Secondary VLT Peers........................................................................................................................... 907RSTP and VLT..........................................................................................................................................................907VLT Bandwidth Monitoring.......................................................................................................................................907VLT and Stacking..................................................................................................................................................... 907VLT and IGMP Snooping..........................................................................................................................................908VLT IPv6.................................................................................................................................................................. 908VLT Port Delayed Restoration.................................................................................................................................. 908PIM-Sparse Mode Support on VLT.......................................................................................................................... 908VLT Routing .............................................................................................................................................................910Non-VLT ARP Sync...................................................................................................................................................912RSTP Configuration........................................................................................................................................................ 912Preventing Forwarding Loops in a VLT Domain......................................................................................................... 912Sample RSTP Configuration......................................................................................................................................912Configuring VLT........................................................................................................................................................ 913PVST+ Configuration......................................................................................................................................................923Sample PVST+ Configuration................................................................................................................................... 923eVLT Configuration Example.......................................................................................................................................... 924eVLT Configuration Step Examples.......................................................................................................................... 924PIM-Sparse Mode Configuration Example..................................................................................................................... 926Verifying a VLT Configuration......................................................................................................................................... 927Additional VLT Sample Configurations............................................................................................................................930Troubleshooting VLT.......................................................................................................................................................932Reconfiguring Stacked Switches as VLT........................................................................................................................ 933Specifying VLT Nodes in a PVLAN................................................................................................................................. 933Association of VLTi as a Member of a PVLAN..........................................................................................................934MAC Synchronization for VLT Nodes in a PVLAN....................................................................................................934PVLAN Operations When One VLT Peer is Down.................................................................................................... 935PVLAN Operations When a VLT Peer is Restarted...................................................................................................935Interoperation of VLT Nodes in a PVLAN with ARP Requests..................................................................................935Scenarios for VLAN Membership and MAC Synchronization With VLT Nodes in PVLAN........................................ 935Configuring a VLT VLAN or LAG in a PVLAN................................................................................................................. 936Creating a VLT LAG or a VLT VLAN......................................................................................................................... 93730
