Concept Guide

Guidelines for Conguring Multipoint Receive-Only Tunnels................................................................................... 999
Multipoint Receive-Only Tunnels................................................................................................................................. 999
55 Uplink Failure Detection (UFD).............................................................................................................. 1000
Feature Description......................................................................................................................................................1000
How Uplink Failure Detection Works.......................................................................................................................... 1001
UFD and NIC Teaming................................................................................................................................................. 1002
Important Points to Remember..................................................................................................................................1002
Conguring Uplink Failure Detection......................................................................................................................... 1003
Clearing a UFD-Disabled Interface.............................................................................................................................1004
Displaying Uplink Failure Detection............................................................................................................................ 1005
Sample Conguration: Uplink Failure Detection....................................................................................................... 1007
56 Upgrade Procedures.............................................................................................................................. 1009
Get Help with Upgrades..............................................................................................................................................1009
57 Virtual LANs (VLANs)............................................................................................................................. 1010
Default VLAN................................................................................................................................................................. 1011
Port-Based VLANs........................................................................................................................................................ 1011
VLANs and Port Tagging..............................................................................................................................................1012
Conguration Task List.................................................................................................................................................1012
Creating a Port-Based VLAN................................................................................................................................ 1012
Assigning Interfaces to a VLAN............................................................................................................................ 1013
Moving Untagged Interfaces.................................................................................................................................1014
Assigning an IP Address to a VLAN......................................................................................................................1015
Conguring Native VLANs...........................................................................................................................................1015
Enabling Null VLAN as the Default VLAN..................................................................................................................1016
58 Virtual Link Trunking (VLT)......................................................................................................................1017
Overview........................................................................................................................................................................1017
VLT Terminology.....................................................................................................................................................1020
Layer-2 Trac in VLT Domains..............................................................................................................................1021
Interspersed VLANs...............................................................................................................................................1022
VLT on Core Switches........................................................................................................................................... 1022
Enhanced VLT.........................................................................................................................................................1023
Congure Virtual Link Trunking...................................................................................................................................1024
Important Points to Remember............................................................................................................................1024
Conguration Notes...............................................................................................................................................1025
Primary and Secondary VLT Peers...................................................................................................................... 1028
RSTP and VLT........................................................................................................................................................ 1029
VLT Bandwidth Monitoring................................................................................................................................... 1029
VLT and Stacking................................................................................................................................................... 1029
VLT and IGMP Snooping.......................................................................................................................................1029
VLT IPv6..................................................................................................................................................................1030
VLT Port Delayed Restoration.............................................................................................................................. 1030
PIM-Sparse Mode Support on VLT..................................................................................................................... 1030
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