Users Guide

57 Tunneling.................................................................................................................................................. 931
Conguring a Tunnel...................................................................................................................................................... 931
Conguring Tunnel Keepalive Settings........................................................................................................................932
Conguring a Tunnel Interface..................................................................................................................................... 932
Conguring Tunnel Allow-Remote Decapsulation......................................................................................................933
Conguring the Tunnel Source Anylocal..................................................................................................................... 933
58 Uplink Failure Detection (UFD)................................................................................................................ 935
Feature Description....................................................................................................................................................... 935
How Uplink Failure Detection Works........................................................................................................................... 936
UFD and NIC Teaming................................................................................................................................................... 937
Important Points to Remember....................................................................................................................................937
Conguring Uplink Failure Detection...........................................................................................................................938
Clearing a UFD-Disabled Interface.............................................................................................................................. 939
Displaying Uplink Failure Detection..............................................................................................................................940
Sample Conguration: Uplink Failure Detection.........................................................................................................942
59 Upgrade Procedures................................................................................................................................ 944
Get Help with Upgrades............................................................................................................................................... 944
60 Virtual LANs (VLANs)..............................................................................................................................945
Default VLAN................................................................................................................................................................. 946
Port-Based VLANs........................................................................................................................................................ 946
VLANs and Port Tagging...............................................................................................................................................947
Conguration Task List..................................................................................................................................................947
Creating a Port-Based VLAN................................................................................................................................. 947
Assigning Interfaces to a VLAN............................................................................................................................. 948
Moving Untagged Interfaces..................................................................................................................................949
Assigning an IP Address to a VLAN...................................................................................................................... 950
Conguring Native VLANs........................................................................................................................................... 950
Enabling Null VLAN as the Default VLAN................................................................................................................... 951
61 Virtual Link Trunking (VLT).......................................................................................................................952
Overview.........................................................................................................................................................................952
VLT Terminology...................................................................................................................................................... 955
Layer-2 Trac in VLT Domains.............................................................................................................................. 956
Interspersed VLANs.................................................................................................................................................957
VLT on Core Switches.............................................................................................................................................957
Enhanced VLT..........................................................................................................................................................958
Congure Virtual Link Trunking....................................................................................................................................959
Important Points to Remember............................................................................................................................. 959
Conguration Notes................................................................................................................................................ 960
Primary and Secondary VLT Peers........................................................................................................................963
RSTP and VLT..........................................................................................................................................................964
VLT Bandwidth Monitoring.....................................................................................................................................964
30
Contents