Connectivity Guide

Table Of Contents
Chapter 60: Upgrade Procedures.............................................................................................. 953
Chapter 61: Virtual LANs (VLANs)............................................................................................. 954
Default VLAN................................................................................................................................................................... 954
Port-Based VLANs......................................................................................................................................................... 955
VLANs and Port Tagging.............................................................................................................................................. 955
Configuration Task List................................................................................................................................................. 956
Creating a Port-Based VLAN.................................................................................................................................956
Assigning Interfaces to a VLAN.............................................................................................................................957
Moving Untagged Interfaces................................................................................................................................. 958
Assigning an IP Address to a VLAN......................................................................................................................959
Configuring Native VLANs............................................................................................................................................959
Enabling Null VLAN as the Default VLAN................................................................................................................. 960
Chapter 62: Virtual Link Trunking (VLT).................................................................................... 961
Overview............................................................................................................................................................................961
VLT Terminology....................................................................................................................................................... 963
Layer-2 Traffic in VLT Domains.............................................................................................................................964
Interspersed VLANs................................................................................................................................................. 965
VLT on Core Switches.............................................................................................................................................965
Enhanced VLT............................................................................................................................................................966
Configure Virtual Link Trunking................................................................................................................................... 967
Important Points to Remember............................................................................................................................. 967
Configuration Notes................................................................................................................................................. 968
Primary and Secondary VLT Peers........................................................................................................................ 971
RSTP and VLT............................................................................................................................................................ 971
VLT Bandwidth Monitoring.....................................................................................................................................972
VLT and Stacking...................................................................................................................................................... 972
VLT and IGMP Snooping......................................................................................................................................... 972
VLT IPv6......................................................................................................................................................................972
VLT Port Delayed Restoration............................................................................................................................... 973
PIM-Sparse Mode Support on VLT...................................................................................................................... 973
VLT Routing .............................................................................................................................................................. 975
Non-VLT ARP Sync.................................................................................................................................................. 978
RSTP Configuration........................................................................................................................................................978
Preventing Forwarding Loops in a VLT Domain.................................................................................................978
Sample RSTP configuration....................................................................................................................................979
Configuring VLT.........................................................................................................................................................979
PVST+ Configuration.....................................................................................................................................................988
Peer Routing Configuration Example.........................................................................................................................989
Dell-1 Switch Configuration....................................................................................................................................990
Dell-2 Switch Configuration................................................................................................................................... 994
R1 Configuration........................................................................................................................................................ 997
Access Switch A1 Configurations and Verification........................................................................................... 998
eVLT Configuration Example....................................................................................................................................... 998
PIM-Sparse Mode Configuration Example...............................................................................................................1001
Verifying a VLT Configuration.....................................................................................................................................1001
Additional VLT Sample Configurations.....................................................................................................................1004
28
Contents