Concept Guide

55 Tunneling................................................................................................................................................. 983
Conguring a Tunnel......................................................................................................................................................983
Conguring Tunnel Keepalive Settings........................................................................................................................984
Conguring a Tunnel Interface.....................................................................................................................................985
Conguring Tunnel Allow-Remote Decapsulation......................................................................................................985
Conguring Tunnel source anylocal Decapsulation....................................................................................................986
Guidelines for Conguring Multipoint Receive-Only Tunnels................................................................................... 986
Multipoint Receive-Only Tunnels................................................................................................................................. 986
56 Uplink Failure Detection (UFD)................................................................................................................ 987
Feature Description........................................................................................................................................................987
How Uplink Failure Detection Works...........................................................................................................................988
UFD and NIC Teaming...................................................................................................................................................989
Important Points to Remember................................................................................................................................... 989
Conguring Uplink Failure Detection...........................................................................................................................990
Clearing a UFD-Disabled Interface...............................................................................................................................991
Displaying Uplink Failure Detection..............................................................................................................................992
Sample Conguration: Uplink Failure Detection.........................................................................................................994
57 Upgrade Procedures................................................................................................................................ 996
Get Help with Upgrades............................................................................................................................................... 996
58 Virtual LANs (VLANs).............................................................................................................................. 997
Default VLAN................................................................................................................................................................. 998
Port-Based VLANs........................................................................................................................................................ 998
VLANs and Port Tagging.............................................................................................................................................. 999
Conguration Task List..................................................................................................................................................999
Creating a Port-Based VLAN.................................................................................................................................999
Assigning Interfaces to a VLAN........................................................................................................................... 1000
Moving Untagged Interfaces.................................................................................................................................1001
Assigning an IP Address to a VLAN..................................................................................................................... 1002
Conguring Native VLANs..........................................................................................................................................1002
Enabling Null VLAN as the Default VLAN................................................................................................................. 1003
59 Virtual Link Trunking (VLT).....................................................................................................................1004
Overview.......................................................................................................................................................................1004
VLT Terminology..................................................................................................................................................... 1007
Layer-2 Trac in VLT Domains.............................................................................................................................1008
Interspersed VLANs...............................................................................................................................................1009
VLT on Core Switches...........................................................................................................................................1009
Enhanced VLT......................................................................................................................................................... 1010
Congure Virtual Link Trunking.................................................................................................................................... 1011
Important Points to Remember............................................................................................................................. 1011
Conguration Notes................................................................................................................................................1012
Primary and Secondary VLT Peers.......................................................................................................................1015
Contents
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