Administrator Guide

Displaying Uplink Failure Detection..............................................................................................................................952
Sample Conguration: Uplink Failure Detection.........................................................................................................954
58 Upgrade Procedures................................................................................................................................956
Get Help with Upgrades............................................................................................................................................... 956
59 Virtual LANs (VLANs)..............................................................................................................................957
Default VLAN................................................................................................................................................................. 958
Port-Based VLANs........................................................................................................................................................ 958
VLANs and Port Tagging.............................................................................................................................................. 959
Conguration Task List..................................................................................................................................................959
Creating a Port-Based VLAN.................................................................................................................................959
Assigning Interfaces to a VLAN............................................................................................................................. 960
Moving Untagged Interfaces.................................................................................................................................. 961
Assigning an IP Address to a VLAN.......................................................................................................................962
Conguring Native VLANs........................................................................................................................................... 962
Enabling Null VLAN as the Default VLAN...................................................................................................................963
60 Virtual Link Trunking (VLT)...................................................................................................................... 964
Overview.........................................................................................................................................................................964
VLT Terminology.......................................................................................................................................................967
Layer-2 Trac in VLT Domains.............................................................................................................................. 968
Interspersed VLANs................................................................................................................................................ 969
VLT on Core Switches............................................................................................................................................ 969
Enhanced VLT.......................................................................................................................................................... 970
Congure Virtual Link Trunking..................................................................................................................................... 971
Important Points to Remember.............................................................................................................................. 971
Conguration Notes.................................................................................................................................................972
Primary and Secondary VLT Peers........................................................................................................................975
RSTP and VLT..........................................................................................................................................................975
VLT Bandwidth Monitoring.....................................................................................................................................976
VLT and Stacking..................................................................................................................................................... 976
VLT and IGMP Snooping.........................................................................................................................................976
VLT IPv6....................................................................................................................................................................976
VLT Port Delayed Restoration................................................................................................................................ 977
PIM-Sparse Mode Support on VLT....................................................................................................................... 977
VLT Routing .............................................................................................................................................................979
Non-VLT ARP Sync................................................................................................................................................. 982
RSTP Conguration.......................................................................................................................................................983
Preventing Forwarding Loops in a VLT Domain................................................................................................... 983
Sample RSTP Conguration...................................................................................................................................983
Conguring VLT....................................................................................................................................................... 984
PVST+ Conguration.................................................................................................................................................... 994
Sample PVST+ Conguration.................................................................................................................................994
Peer Routing Conguration Example..........................................................................................................................995
Dell-1 Switch Conguration.................................................................................................................................... 996
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