Concept Guide

Default VLAN..................................................................................................................................................................937
Port-Based VLANs........................................................................................................................................................ 937
VLANs and Port Tagging.............................................................................................................................................. 938
Conguration Task List..................................................................................................................................................938
Creating a Port-Based VLAN................................................................................................................................. 938
Assigning Interfaces to a VLAN............................................................................................................................. 939
Moving Untagged Interfaces..................................................................................................................................940
Assigning an IP Address to a VLAN....................................................................................................................... 941
Conguring Native VLANs............................................................................................................................................ 941
Enabling Null VLAN as the Default VLAN...................................................................................................................942
58 Virtual Link Trunking (VLT)...................................................................................................................... 943
Overview.........................................................................................................................................................................943
VLT Terminology...................................................................................................................................................... 946
Layer-2 Trac in VLT Domains...............................................................................................................................947
Interspersed VLANs................................................................................................................................................ 948
VLT on Core Switches.............................................................................................................................................948
Enhanced VLT..........................................................................................................................................................949
Congure Virtual Link Trunking....................................................................................................................................950
Important Points to Remember............................................................................................................................. 950
Conguration Notes.................................................................................................................................................951
Primary and Secondary VLT Peers........................................................................................................................954
RSTP and VLT..........................................................................................................................................................955
VLT Bandwidth Monitoring.................................................................................................................................... 955
VLT and Stacking.....................................................................................................................................................955
VLT and IGMP Snooping........................................................................................................................................ 955
VLT IPv6................................................................................................................................................................... 956
VLT Port Delayed Restoration................................................................................................................................956
PIM-Sparse Mode Support on VLT.......................................................................................................................956
VLT Routing .............................................................................................................................................................958
Non-VLT ARP Sync..................................................................................................................................................961
RSTP Conguration.......................................................................................................................................................962
Preventing Forwarding Loops in a VLT Domain................................................................................................... 962
Sample RSTP conguration................................................................................................................................... 962
Conguring VLT....................................................................................................................................................... 963
PVST+ Conguration.....................................................................................................................................................973
Sample PVST+ Conguration................................................................................................................................. 974
Peer Routing Conguration Example...........................................................................................................................974
Dell-1 Switch Conguration.....................................................................................................................................975
Dell-2 Switch Conguration....................................................................................................................................979
R1 Conguration.......................................................................................................................................................982
Access Switch A1 Congurations and Verication.............................................................................................. 983
eVLT Conguration Example........................................................................................................................................984
eVLT Conguration Step Examples.......................................................................................................................984
PIM-Sparse Mode Conguration Example.................................................................................................................986
Verifying a VLT Conguration.......................................................................................................................................987
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