Administrator Guide

59 Upgrade Procedures............................................................................................................... 860
60 Virtual LANs (VLANs).............................................................................................................. 861
Default VLAN......................................................................................................................................................................861
Port-Based VLANs............................................................................................................................................................862
VLANs and Port Tagging..................................................................................................................................................862
Configuration Task List.....................................................................................................................................................863
Creating a Port-Based VLAN.....................................................................................................................................863
Assigning Interfaces to a VLAN.................................................................................................................................863
Moving Untagged Interfaces..................................................................................................................................... 864
Assigning an IP Address to a VLAN.......................................................................................................................... 865
Configuring Native VLANs...............................................................................................................................................866
Enabling Null VLAN as the Default VLAN...................................................................................................................... 866
61 Virtual Link Trunking (VLT)...................................................................................................... 867
Overview............................................................................................................................................................................ 867
VLT Terminology......................................................................................................................................................... 869
Layer-2 Traffic in VLT Domains.................................................................................................................................869
Interspersed VLANs.................................................................................................................................................... 870
VLT on Core Switches.................................................................................................................................................871
Enhanced VLT.............................................................................................................................................................. 871
Configure Virtual Link Trunking....................................................................................................................................... 872
Important Points to Remember................................................................................................................................. 872
Configuration Notes....................................................................................................................................................873
Primary and Secondary VLT Peers........................................................................................................................... 876
RSTP and VLT............................................................................................................................................................. 876
VLT Bandwidth Monitoring........................................................................................................................................ 877
VLT and Stacking.........................................................................................................................................................877
VLT and IGMP Snooping............................................................................................................................................ 877
VLT IPv6....................................................................................................................................................................... 877
VLT Port Delayed Restoration................................................................................................................................... 877
PIM-Sparse Mode Support on VLT.......................................................................................................................... 878
VLT Routing ................................................................................................................................................................ 879
Non-VLT ARP Sync.................................................................................................................................................... 882
RSTP Configuration.......................................................................................................................................................... 882
Preventing Forwarding Loops in a VLT Domain......................................................................................................882
Sample RSTP configuration....................................................................................................................................... 883
Configuring VLT...........................................................................................................................................................883
PVST+ Configuration........................................................................................................................................................892
Peer Routing Configuration Example..............................................................................................................................892
Dell-1 Switch Configuration........................................................................................................................................893
Dell-2 Switch Configuration....................................................................................................................................... 897
R1 Configuration..........................................................................................................................................................900
Access Switch A1 Configurations and Verification.................................................................................................. 901
eVLT Configuration Example............................................................................................................................................901
PIM-Sparse Mode Configuration Example.................................................................................................................... 904
Verifying a VLT Configuration......................................................................................................................................... 904
Additional VLT Sample Configurations........................................................................................................................... 907
Contents
27