Administrator Guide

Setting Recurring Daylight Saving Time...................................................................................................................866
55 Tunneling...............................................................................................................................868
Configuring a Tunnel.........................................................................................................................................................868
Configuring Tunnel Keepalive Settings...........................................................................................................................869
Configuring a Tunnel Interface........................................................................................................................................869
Configuring Tunnel Allow-Remote Decapsulation.........................................................................................................870
Configuring Tunnel source anylocal Decapsulation.......................................................................................................870
Guidelines for Configuring Multipoint Receive-Only Tunnels....................................................................................... 871
Multipoint Receive-Only Tunnels..................................................................................................................................... 871
56 Uplink Failure Detection (UFD)................................................................................................ 872
Feature Description...........................................................................................................................................................872
How Uplink Failure Detection Works.............................................................................................................................. 873
UFD and NIC Teaming...................................................................................................................................................... 874
Important Points to Remember.......................................................................................................................................874
Configuring Uplink Failure Detection.............................................................................................................................. 875
Clearing a UFD-Disabled Interface..................................................................................................................................876
Displaying Uplink Failure Detection..................................................................................................................................877
Sample Configuration: Uplink Failure Detection............................................................................................................ 878
57 Upgrade Procedures............................................................................................................... 880
58 Virtual LANs (VLANs).............................................................................................................. 881
Default VLAN......................................................................................................................................................................881
Port-Based VLANs............................................................................................................................................................882
VLANs and Port Tagging..................................................................................................................................................882
Configuration Task List.....................................................................................................................................................883
Creating a Port-Based VLAN.....................................................................................................................................883
Assigning Interfaces to a VLAN.................................................................................................................................883
Moving Untagged Interfaces..................................................................................................................................... 884
Assigning an IP Address to a VLAN.......................................................................................................................... 885
Configuring Native VLANs...............................................................................................................................................886
Enabling Null VLAN as the Default VLAN...................................................................................................................... 886
59 Virtual Link Trunking (VLT)......................................................................................................887
Overview............................................................................................................................................................................ 887
VLT Terminology......................................................................................................................................................... 889
Layer-2 Traffic in VLT Domains.................................................................................................................................889
Interspersed VLANs....................................................................................................................................................890
VLT on Core Switches.................................................................................................................................................891
Enhanced VLT.............................................................................................................................................................. 891
Configure Virtual Link Trunking....................................................................................................................................... 892
Important Points to Remember.................................................................................................................................892
Configuration Notes....................................................................................................................................................893
Primary and Secondary VLT Peers........................................................................................................................... 896
RSTP and VLT............................................................................................................................................................. 896
VLT Bandwidth Monitoring........................................................................................................................................ 897
VLT and Stacking........................................................................................................................................................ 897
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