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Table Of Contents
Multipoint Receive-Only Tunnels................................................................................................................................ 907
Chapter 55: Uplink Failure Detection (UFD).............................................................................. 908
Feature Description........................................................................................................................................................908
How Uplink Failure Detection Works......................................................................................................................... 909
UFD and NIC Teaming....................................................................................................................................................910
Important Points to Remember....................................................................................................................................910
Configuring Uplink Failure Detection........................................................................................................................... 911
Clearing a UFD-Disabled Interface.............................................................................................................................. 912
Displaying Uplink Failure Detection............................................................................................................................. 913
Sample Configuration: Uplink Failure Detection.......................................................................................................915
Chapter 56: Upgrade Procedures............................................................................................... 916
Chapter 57: Virtual LANs (VLANs)..............................................................................................917
Default VLAN.................................................................................................................................................................... 917
Port-Based VLANs.......................................................................................................................................................... 918
VLANs and Port Tagging............................................................................................................................................... 918
Configuration Task List.................................................................................................................................................. 919
Creating a Port-Based VLAN..................................................................................................................................919
Assigning Interfaces to a VLAN.............................................................................................................................920
Moving Untagged Interfaces.................................................................................................................................. 921
Assigning an IP Address to a VLAN...................................................................................................................... 922
Configuring Native VLANs............................................................................................................................................922
Enabling Null VLAN as the Default VLAN................................................................................................................. 923
Chapter 58: Virtual Link Trunking (VLT).................................................................................... 924
Overview...........................................................................................................................................................................924
VLT Terminology....................................................................................................................................................... 926
Layer-2 Traffic in VLT Domains.............................................................................................................................927
Interspersed VLANs..................................................................................................................................................928
VLT on Core Switches............................................................................................................................................. 928
Enhanced VLT............................................................................................................................................................929
Configure Virtual Link Trunking...................................................................................................................................930
Important Points to Remember............................................................................................................................. 930
Configuration Notes..................................................................................................................................................931
Primary and Secondary VLT Peers....................................................................................................................... 934
RSTP and VLT........................................................................................................................................................... 934
VLT Bandwidth Monitoring.....................................................................................................................................935
VLT and Stacking......................................................................................................................................................935
VLT and IGMP Snooping.........................................................................................................................................935
VLT IPv6......................................................................................................................................................................935
VLT Port Delayed Restoration............................................................................................................................... 936
PIM-Sparse Mode Support on VLT...................................................................................................................... 936
VLT Routing .............................................................................................................................................................. 938
Non-VLT ARP Sync...................................................................................................................................................941
RSTP Configuration........................................................................................................................................................ 941
Preventing Forwarding Loops in a VLT Domain................................................................................................. 941
Sample RSTP configuration....................................................................................................................................942
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