Users Guide

Get Help with Upgrades............................................................................................................................................... 954
59 Virtual LANs (VLANs)..............................................................................................................................955
Default VLAN.................................................................................................................................................................956
Port-Based VLANs........................................................................................................................................................956
VLANs and Port Tagging..............................................................................................................................................957
Configuration Task List.................................................................................................................................................957
Creating a Port-Based VLAN.................................................................................................................................957
Assigning Interfaces to a VLAN.............................................................................................................................958
Moving Untagged Interfaces................................................................................................................................. 959
Assigning an IP Address to a VLAN...................................................................................................................... 960
Configuring Native VLANs........................................................................................................................................... 960
Enabling Null VLAN as the Default VLAN................................................................................................................... 961
60 Virtual Link Trunking (VLT)..................................................................................................................... 962
Overview........................................................................................................................................................................ 962
VLT Terminology..................................................................................................................................................... 965
Layer-2 Traffic in VLT Domains.............................................................................................................................966
Interspersed VLANs................................................................................................................................................ 967
VLT on Core Switches............................................................................................................................................967
Enhanced VLT..........................................................................................................................................................968
Configure Virtual Link Trunking................................................................................................................................... 969
Important Points to Remember.............................................................................................................................969
Configuration Notes................................................................................................................................................970
Primary and Secondary VLT Peers........................................................................................................................973
RSTP and VLT..........................................................................................................................................................973
VLT Bandwidth Monitoring.................................................................................................................................... 974
VLT and Stacking.....................................................................................................................................................974
VLT and IGMP Snooping........................................................................................................................................ 974
VLT IPv6................................................................................................................................................................... 974
VLT Port Delayed Restoration............................................................................................................................... 975
PIM-Sparse Mode Support on VLT.......................................................................................................................975
VLT Routing .............................................................................................................................................................977
Non-VLT ARP Sync................................................................................................................................................ 980
RSTP Configuration....................................................................................................................................................... 981
Preventing Forwarding Loops in a VLT Domain...................................................................................................981
Sample RSTP Configuration................................................................................................................................... 981
Configuring VLT.......................................................................................................................................................982
PVST+ Configuration....................................................................................................................................................992
Sample PVST+ Configuration................................................................................................................................992
Peer Routing Configuration Example..........................................................................................................................993
Dell-1 Switch Configuration....................................................................................................................................994
Dell-2 Switch Configuration...................................................................................................................................998
R1 Configuration......................................................................................................................................................1001
Access Switch A1 Configurations and Verification............................................................................................1002
eVLT Configuration Example......................................................................................................................................1003
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Contents