Users Guide

Configuring Uplink Failure Detection...........................................................................................................................888
Clearing a UFD-Disabled Interface..............................................................................................................................889
Displaying Uplink Failure Detection............................................................................................................................. 890
Sample Configuration: Uplink Failure Detection........................................................................................................ 892
54 Upgrade Procedures................................................................................................................................894
Get Help with Upgrades............................................................................................................................................... 894
55 Virtual LANs (VLANs)..............................................................................................................................895
Default VLAN................................................................................................................................................................. 896
Port-Based VLANs........................................................................................................................................................896
VLANs and Port Tagging..............................................................................................................................................897
Configuration Task List................................................................................................................................................. 897
Creating a Port-Based VLAN.................................................................................................................................897
Assigning Interfaces to a VLAN.............................................................................................................................898
Moving Untagged Interfaces................................................................................................................................. 899
Assigning an IP Address to a VLAN...................................................................................................................... 900
Configuring Native VLANs........................................................................................................................................... 900
Enabling Null VLAN as the Default VLAN................................................................................................................... 901
56 Virtual Link Trunking (VLT)..................................................................................................................... 902
Overview........................................................................................................................................................................ 902
VLT Terminology..................................................................................................................................................... 905
Layer-2 Traffic in VLT Domains.............................................................................................................................906
Interspersed VLANs................................................................................................................................................ 907
VLT on Core Switches............................................................................................................................................907
Enhanced VLT......................................................................................................................................................... 908
Configure Virtual Link Trunking................................................................................................................................... 909
Important Points to Remember.............................................................................................................................909
Configuration Notes.................................................................................................................................................910
Primary and Secondary VLT Peers........................................................................................................................ 913
RSTP and VLT.......................................................................................................................................................... 913
VLT Bandwidth Monitoring.....................................................................................................................................914
VLT and Stacking..................................................................................................................................................... 914
VLT and IGMP Snooping.........................................................................................................................................914
VLT IPv6....................................................................................................................................................................914
VLT Port Delayed Restoration................................................................................................................................915
PIM-Sparse Mode Support on VLT....................................................................................................................... 915
VLT Routing ............................................................................................................................................................. 917
Non-VLT ARP Sync................................................................................................................................................ 920
RSTP Configuration....................................................................................................................................................... 921
Preventing Forwarding Loops in a VLT Domain...................................................................................................921
Sample RSTP Configuration................................................................................................................................... 921
Configuring VLT.......................................................................................................................................................922
PVST+ Configuration....................................................................................................................................................932
Sample PVST+ Configuration................................................................................................................................ 932
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