Concept Guide

Port-Based VLANs.......................................................................................................................................................1002
VLANs and Port Tagging.............................................................................................................................................1003
Conguration Task List................................................................................................................................................ 1003
Creating a Port-Based VLAN............................................................................................................................... 1003
Assigning Interfaces to a VLAN............................................................................................................................1004
Moving Untagged Interfaces................................................................................................................................1005
Assigning an IP Address to a VLAN.....................................................................................................................1006
Conguring Native VLANs..........................................................................................................................................1006
Enabling Null VLAN as the Default VLAN................................................................................................................. 1007
60 Virtual Link Trunking (VLT).....................................................................................................................1008
Overview.......................................................................................................................................................................1008
VLT Terminology.......................................................................................................................................................1011
Layer-2 Trac in VLT Domains..............................................................................................................................1012
Interspersed VLANs................................................................................................................................................1013
VLT on Core Switches............................................................................................................................................1013
Enhanced VLT......................................................................................................................................................... 1014
Congure Virtual Link Trunking................................................................................................................................... 1015
Important Points to Remember.............................................................................................................................1015
Conguration Notes............................................................................................................................................... 1016
Primary and Secondary VLT Peers.......................................................................................................................1019
RSTP and VLT........................................................................................................................................................ 1020
VLT Bandwidth Monitoring................................................................................................................................... 1020
VLT and Stacking................................................................................................................................................... 1020
VLT and IGMP Snooping.......................................................................................................................................1020
VLT IPv6...................................................................................................................................................................1021
VLT Port Delayed Restoration............................................................................................................................... 1021
PIM-Sparse Mode Support on VLT...................................................................................................................... 1021
VLT Routing ........................................................................................................................................................... 1023
Non-VLT ARP Sync................................................................................................................................................1026
RSTP Conguration..................................................................................................................................................... 1027
Preventing Forwarding Loops in a VLT Domain.................................................................................................. 1027
Sample RSTP conguration.................................................................................................................................. 1027
Conguring VLT......................................................................................................................................................1028
PVST+ Conguration................................................................................................................................................... 1038
Sample PVST+ Conguration............................................................................................................................... 1039
Peer Routing Conguration Example.........................................................................................................................1039
Dell-1 Switch Conguration...................................................................................................................................1040
Dell-2 Switch Conguration.................................................................................................................................. 1044
R1 Conguration..................................................................................................................................................... 1047
Access Switch A1 Congurations and Verication.............................................................................................1048
eVLT Conguration Example...................................................................................................................................... 1049
eVLT Conguration Step Examples..................................................................................................................... 1049
PIM-Sparse Mode Conguration Example................................................................................................................ 1051
Verifying a VLT Conguration.....................................................................................................................................1052
Additional VLT Sample Congurations...................................................................................................................... 1055
Contents
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