Reference Guide
55 Tunneling ............................................................................................................945
Configuring a Tunnel........................................................................................................................945
Configuring Tunnel keepalive..........................................................................................................946
Configuring the ip and ipv6 unnumbered....................................................................................... 947
Configuring the Tunnel allow-remote.............................................................................................947
Configuring the tunnel source anylocal..........................................................................................948
56 Uplink Failure Detection (UFD)...................................................................... 949
Feature Description.......................................................................................................................... 949
How Uplink Failure Detection Works...............................................................................................950
UFD and NIC Teaming...................................................................................................................... 951
Important Points to Remember........................................................................................................951
Configuring Uplink Failure Detection.............................................................................................. 953
Clearing a UFD-Disabled Interface.................................................................................................. 954
Displaying Uplink Failure Detection.................................................................................................956
Sample Configuration: Uplink Failure Detection.............................................................................958
57 Upgrade Procedures..........................................................................................961
Get Help with Upgrades....................................................................................................................961
58 Virtual LANs (VLANs)......................................................................................... 963
Default VLAN.....................................................................................................................................963
Port-Based VLANs............................................................................................................................ 964
VLANs and Port Tagging.................................................................................................................. 964
Configuration Task List.....................................................................................................................965
Creating a Port-Based VLAN...................................................................................................... 965
Assigning Interfaces to a VLAN.................................................................................................. 966
Moving Untagged Interfaces......................................................................................................968
Assigning an IP Address to a VLAN............................................................................................ 969
Configuring Native VLANs................................................................................................................969
Enabling Null VLAN as the Default VLAN.........................................................................................970
59 Virtual Link Trunking (VLT).............................................................................. 971
Overview............................................................................................................................................971
VLT on Core Switches.................................................................................................................972
Enhanced VLT............................................................................................................................. 972
VLT Terminology...............................................................................................................................973
Configure Virtual Link Trunking....................................................................................................... 974
Important Points to Remember................................................................................................. 974
Configuration Notes................................................................................................................... 975
Primary and Secondary VLT Peers............................................................................................. 978