Users Guide

Clearing a UFD-Disabled Interface.............................................................................................................................. 862
Displaying Uplink Failure Detection..............................................................................................................................863
Sample Configuration: Uplink Failure Detection........................................................................................................ 865
55 Upgrade Procedures................................................................................................................................867
Get Help with Upgrades............................................................................................................................................... 867
56 Virtual LANs (VLANs)..............................................................................................................................868
Default VLAN................................................................................................................................................................. 869
Port-Based VLANs........................................................................................................................................................869
VLANs and Port Tagging..............................................................................................................................................870
Configuration Task List.................................................................................................................................................870
Creating a Port-Based VLAN.................................................................................................................................870
Assigning Interfaces to a VLAN..............................................................................................................................871
Moving Untagged Interfaces..................................................................................................................................872
Assigning an IP Address to a VLAN.......................................................................................................................873
Configuring Native VLANs............................................................................................................................................873
Enabling Null VLAN as the Default VLAN...................................................................................................................874
57 Virtual Link Trunking (VLT)......................................................................................................................875
Overview.........................................................................................................................................................................875
VLT Terminology......................................................................................................................................................878
Layer-2 Traffic in VLT Domains.............................................................................................................................879
Interspersed VLANs................................................................................................................................................ 880
VLT on Core Switches............................................................................................................................................880
Enhanced VLT.......................................................................................................................................................... 881
Configure Virtual Link Trunking................................................................................................................................... 882
Important Points to Remember.............................................................................................................................882
Configuration Notes................................................................................................................................................883
Primary and Secondary VLT Peers....................................................................................................................... 886
RSTP and VLT......................................................................................................................................................... 886
VLT Bandwidth Monitoring.................................................................................................................................... 887
VLT and Stacking.....................................................................................................................................................887
VLT and IGMP Snooping........................................................................................................................................ 887
VLT IPv6................................................................................................................................................................... 887
VLT Port Delayed Restoration...............................................................................................................................888
PIM-Sparse Mode Support on VLT...................................................................................................................... 888
VLT Routing ............................................................................................................................................................ 890
Non-VLT ARP Sync................................................................................................................................................ 893
RSTP Configuration...................................................................................................................................................... 894
Preventing Forwarding Loops in a VLT Domain.................................................................................................. 894
Sample RSTP Configuration.................................................................................................................................. 894
Configuring VLT.......................................................................................................................................................895
PVST+ Configuration....................................................................................................................................................905
Sample PVST+ Configuration................................................................................................................................905
Peer Routing Configuration Example..........................................................................................................................906
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