Administrator Guide

Important Points to Remember................................................................................................................................... 953
Conguring Uplink Failure Detection...........................................................................................................................954
Clearing a UFD-Disabled Interface.............................................................................................................................. 955
Displaying Uplink Failure Detection..............................................................................................................................956
Sample Conguration: Uplink Failure Detection.........................................................................................................958
58 Upgrade Procedures................................................................................................................................960
Get Help with Upgrades............................................................................................................................................... 960
59 Virtual LANs (VLANs).............................................................................................................................. 961
Default VLAN................................................................................................................................................................. 962
Port-Based VLANs........................................................................................................................................................ 962
VLANs and Port Tagging.............................................................................................................................................. 963
Conguration Task List..................................................................................................................................................963
Creating a Port-Based VLAN.................................................................................................................................963
Assigning Interfaces to a VLAN............................................................................................................................. 964
Moving Untagged Interfaces................................................................................................................................. 965
Assigning an IP Address to a VLAN.......................................................................................................................966
Conguring Native VLANs........................................................................................................................................... 966
Enabling Null VLAN as the Default VLAN...................................................................................................................967
60 Virtual Link Trunking (VLT)...................................................................................................................... 968
Overview.........................................................................................................................................................................968
VLT Terminology....................................................................................................................................................... 971
Layer-2 Trac in VLT Domains...............................................................................................................................972
Interspersed VLANs.................................................................................................................................................973
VLT on Core Switches.............................................................................................................................................973
Enhanced VLT...........................................................................................................................................................974
Congure Virtual Link Trunking.................................................................................................................................... 975
Important Points to Remember..............................................................................................................................975
Conguration Notes.................................................................................................................................................976
Primary and Secondary VLT Peers........................................................................................................................ 979
RSTP and VLT.......................................................................................................................................................... 979
VLT Bandwidth Monitoring.....................................................................................................................................980
VLT and Stacking.....................................................................................................................................................980
VLT and IGMP Snooping........................................................................................................................................ 980
VLT IPv6................................................................................................................................................................... 980
VLT Port Delayed Restoration.................................................................................................................................981
PIM-Sparse Mode Support on VLT........................................................................................................................981
VLT Routing .............................................................................................................................................................983
Non-VLT ARP Sync................................................................................................................................................. 986
RSTP Conguration.......................................................................................................................................................987
Preventing Forwarding Loops in a VLT Domain................................................................................................... 987
Sample RSTP Conguration...................................................................................................................................987
Conguring VLT....................................................................................................................................................... 988
PVST+ Conguration.................................................................................................................................................... 998
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