Users Guide
Enabling Null VLAN as the Default VLAN...................................................................................................................889
60 Virtual Link Trunking (VLT)...................................................................................................................... 890
Overview........................................................................................................................................................................ 890
VLT on Core Switches............................................................................................................................................. 891
Enhanced VLT...........................................................................................................................................................891
VLT Terminology.............................................................................................................................................................892
Congure Virtual Link Trunking.................................................................................................................................... 892
Important Points to Remember............................................................................................................................. 892
Conguration Notes................................................................................................................................................ 894
Primary and Secondary VLT Peers........................................................................................................................896
RSTP and VLT.......................................................................................................................................................... 897
VLT Bandwidth Monitoring.....................................................................................................................................897
VLT and Stacking..................................................................................................................................................... 897
VLT and IGMP Snooping.........................................................................................................................................897
VLT IPv6................................................................................................................................................................... 898
VLT Port Delayed Restoration................................................................................................................................898
PIM-Sparse Mode Support on VLT.......................................................................................................................898
VLT Routing .............................................................................................................................................................900
Non-VLT ARP Sync................................................................................................................................................. 902
RSTP Conguration.......................................................................................................................................................902
Preventing Forwarding Loops in a VLT Domain................................................................................................... 902
Sample RSTP Conguration...................................................................................................................................903
Conguring VLT....................................................................................................................................................... 903
PVST+ Conguration..................................................................................................................................................... 913
Sample PVST+ Conguration................................................................................................................................. 913
eVLT Conguration Example.........................................................................................................................................914
eVLT Conguration Step Examples........................................................................................................................915
PIM-Sparse Mode Conguration Example..................................................................................................................917
Verifying a VLT Conguration....................................................................................................................................... 917
Additional VLT Sample Congurations........................................................................................................................ 920
Troubleshooting VLT......................................................................................................................................................922
Reconguring Stacked Switches as VLT.................................................................................................................... 923
Specifying VLT Nodes in a PVLAN..............................................................................................................................924
Association of VLTi as a Member of a PVLAN.....................................................................................................924
MAC Synchronization for VLT Nodes in a PVLAN.............................................................................................. 925
PVLAN Operations When One VLT Peer is Down...............................................................................................925
PVLAN Operations When a VLT Peer is Restarted.............................................................................................925
Interoperation of VLT Nodes in a PVLAN with ARP Requests.......................................................................... 925
Scenarios for VLAN Membership and MAC Synchronization With VLT Nodes in PVLAN............................ 926
Conguring a VLT VLAN or LAG in a PVLAN............................................................................................................ 927
Creating a VLT LAG or a VLT VLAN...................................................................................................................... 927
Associating the VLT LAG or VLT VLAN in a PVLAN...........................................................................................928
Proxy ARP Capability on VLT Peer Nodes..................................................................................................................929
Working of Proxy ARP for VLT Peer Nodes.........................................................................................................929
VLT Nodes as Rendezvous Points for Multicast Resiliency..................................................................................... 930
Conguring VLAN-Stack over VLT.............................................................................................................................. 931
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