Users Guide

How Uplink Failure Detection Works...........................................................................................................................858
UFD and NIC Teaming...................................................................................................................................................859
Important Points to Remember................................................................................................................................... 859
Conguring Uplink Failure Detection...........................................................................................................................860
Clearing a UFD-Disabled Interface...............................................................................................................................861
Displaying Uplink Failure Detection..............................................................................................................................862
Sample Conguration: Uplink Failure Detection.........................................................................................................864
55 Upgrade Procedures................................................................................................................................866
Get Help with Upgrades............................................................................................................................................... 866
56 Virtual LANs (VLANs)..............................................................................................................................867
Default VLAN................................................................................................................................................................. 868
Port-Based VLANs........................................................................................................................................................ 868
VLANs and Port Tagging.............................................................................................................................................. 869
Conguration Task List..................................................................................................................................................869
Creating a Port-Based VLAN.................................................................................................................................869
Assigning Interfaces to a VLAN............................................................................................................................. 870
Moving Untagged Interfaces...................................................................................................................................871
Assigning an IP Address to a VLAN....................................................................................................................... 872
Conguring Native VLANs............................................................................................................................................872
Enabling Null VLAN as the Default VLAN...................................................................................................................873
57 Virtual Link Trunking (VLT)....................................................................................................................... 874
Overview......................................................................................................................................................................... 874
VLT Terminology.......................................................................................................................................................877
Layer-2 Trac in VLT Domains...............................................................................................................................878
Interspersed VLANs.................................................................................................................................................879
VLT on Core Switches.............................................................................................................................................879
Enhanced VLT..........................................................................................................................................................880
Congure Virtual Link Trunking.....................................................................................................................................881
Important Points to Remember.............................................................................................................................. 881
Conguration Notes................................................................................................................................................ 882
Primary and Secondary VLT Peers........................................................................................................................885
RSTP and VLT..........................................................................................................................................................885
VLT Bandwidth Monitoring.....................................................................................................................................886
VLT and Stacking.....................................................................................................................................................886
VLT and IGMP Snooping........................................................................................................................................ 886
VLT IPv6................................................................................................................................................................... 886
VLT Port Delayed Restoration................................................................................................................................ 887
PIM-Sparse Mode Support on VLT....................................................................................................................... 887
VLT Routing .............................................................................................................................................................889
Non-VLT ARP Sync................................................................................................................................................. 892
RSTP Conguration.......................................................................................................................................................893
Preventing Forwarding Loops in a VLT Domain................................................................................................... 893
Sample RSTP Conguration...................................................................................................................................893
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Contents