Users Guide

Get Help with Upgrades............................................................................................................................................... 934
59 Virtual LANs (VLANs)..............................................................................................................................935
Default VLAN................................................................................................................................................................. 936
Port-Based VLANs........................................................................................................................................................936
VLANs and Port Tagging..............................................................................................................................................937
Configuration Task List................................................................................................................................................. 937
Creating a Port-Based VLAN.................................................................................................................................937
Assigning Interfaces to a VLAN.............................................................................................................................938
Moving Untagged Interfaces................................................................................................................................. 939
Assigning an IP Address to a VLAN...................................................................................................................... 940
Configuring Native VLANs........................................................................................................................................... 940
Enabling Null VLAN as the Default VLAN................................................................................................................... 941
60 Virtual Link Trunking (VLT)..................................................................................................................... 942
Overview.........................................................................................................................................................................942
VLT Terminology..................................................................................................................................................... 945
Layer-2 Traffic in VLT Domains.............................................................................................................................946
Interspersed VLANs................................................................................................................................................ 947
VLT on Core Switches............................................................................................................................................ 947
Enhanced VLT..........................................................................................................................................................948
Configure Virtual Link Trunking................................................................................................................................... 949
Important Points to Remember.............................................................................................................................949
Configuration Notes................................................................................................................................................950
Primary and Secondary VLT Peers....................................................................................................................... 953
RSTP and VLT......................................................................................................................................................... 953
VLT Bandwidth Monitoring.................................................................................................................................... 954
VLT and Stacking.................................................................................................................................................... 954
VLT and IGMP Snooping........................................................................................................................................954
VLT IPv6...................................................................................................................................................................954
VLT Port Delayed Restoration...............................................................................................................................955
PIM-Sparse Mode Support on VLT...................................................................................................................... 955
VLT Routing ............................................................................................................................................................ 957
Non-VLT ARP Sync................................................................................................................................................ 960
RSTP Configuration.......................................................................................................................................................961
Preventing Forwarding Loops in a VLT Domain...................................................................................................961
Sample RSTP Configuration................................................................................................................................... 961
Configuring VLT.......................................................................................................................................................962
PVST+ Configuration.................................................................................................................................................... 972
Sample PVST+ Configuration................................................................................................................................ 972
Peer Routing Configuration Example..........................................................................................................................973
Dell-1 Switch Configuration.................................................................................................................................... 974
Dell-2 Switch Configuration................................................................................................................................... 978
R1 Configuration....................................................................................................................................................... 981
Access Switch A1 Configurations and Verification..............................................................................................982
eVLT Configuration Example....................................................................................................................................... 983
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