Administrator Guide

59 Upgrade Procedures................................................................................................................861
60 Virtual LANs (VLANs)..............................................................................................................862
Default VLAN.....................................................................................................................................................................862
Port-Based VLANs............................................................................................................................................................863
VLANs and Port Tagging..................................................................................................................................................863
Configuration Task List.....................................................................................................................................................864
Creating a Port-Based VLAN.....................................................................................................................................864
Assigning Interfaces to a VLAN.................................................................................................................................864
Moving Untagged Interfaces.....................................................................................................................................865
Assigning an IP Address to a VLAN.......................................................................................................................... 866
Configuring Native VLANs............................................................................................................................................... 867
Enabling Null VLAN as the Default VLAN...................................................................................................................... 867
61 Virtual Link Trunking (VLT)...................................................................................................... 868
Overview............................................................................................................................................................................ 868
VLT Terminology..........................................................................................................................................................870
Layer-2 Traffic in VLT Domains.................................................................................................................................870
Interspersed VLANs..................................................................................................................................................... 871
VLT on Core Switches................................................................................................................................................872
Enhanced VLT..............................................................................................................................................................872
Configure Virtual Link Trunking....................................................................................................................................... 873
Important Points to Remember................................................................................................................................. 873
Configuration Notes....................................................................................................................................................874
Primary and Secondary VLT Peers............................................................................................................................877
RSTP and VLT..............................................................................................................................................................877
VLT Bandwidth Monitoring........................................................................................................................................ 878
VLT and Stacking........................................................................................................................................................ 878
VLT and IGMP Snooping............................................................................................................................................ 878
VLT IPv6....................................................................................................................................................................... 878
VLT Port Delayed Restoration................................................................................................................................... 878
PIM-Sparse Mode Support on VLT.......................................................................................................................... 879
VLT Routing ................................................................................................................................................................880
Non-VLT ARP Sync.................................................................................................................................................... 883
RSTP Configuration.......................................................................................................................................................... 883
Preventing Forwarding Loops in a VLT Domain......................................................................................................883
Sample RSTP configuration....................................................................................................................................... 884
Configuring VLT...........................................................................................................................................................884
PVST+ Configuration........................................................................................................................................................893
Peer Routing Configuration Example..............................................................................................................................893
Dell-1 Switch Configuration........................................................................................................................................894
Dell-2 Switch Configuration.......................................................................................................................................898
R1 Configuration...........................................................................................................................................................901
Access Switch A1 Configurations and Verification................................................................................................. 902
eVLT Configuration Example...........................................................................................................................................902
PIM-Sparse Mode Configuration Example.................................................................................................................... 905
Verifying a VLT Configuration......................................................................................................................................... 905
Additional VLT Sample Configurations...........................................................................................................................908
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