Reference Guide

Default VLAN........................................................................................................................................................ 701
Port-Based VLANs................................................................................................................................................702
VLANs and Port Tagging.......................................................................................................................................702
Configuration Task List......................................................................................................................................... 703
Creating a Port-Based VLAN..........................................................................................................................703
Assigning Interfaces to a VLAN..................................................................................................................... 704
Moving Untagged Interfaces......................................................................................................................... 705
Assigning an IP Address to a VLAN...............................................................................................................706
Configuring Native VLANs.................................................................................................................................... 707
Enabling Null VLAN as the Default VLAN............................................................................................................. 707
49 Virtual Link Trunking (VLT)...................................................................................................709
Overview...............................................................................................................................................................709
VLT on Core Switches.................................................................................................................................... 710
Enhanced VLT.................................................................................................................................................710
VLT Terminology................................................................................................................................................... 711
Configure Virtual Link Trunking............................................................................................................................ 712
Important Points to Remember...................................................................................................................... 712
Configuration Notes....................................................................................................................................... 713
Primary and Secondary VLT Peers................................................................................................................ 716
RSTP and VLT.................................................................................................................................................716
VLT Bandwidth Monitoring.............................................................................................................................717
VLT and Stacking............................................................................................................................................717
VLT and IGMP Snooping................................................................................................................................ 717
VLT IPv6..........................................................................................................................................................717
VLT Port Delayed Restoration........................................................................................................................ 718
PIM-Sparse Mode Support on VLT................................................................................................................ 718
VLT Routing ................................................................................................................................................... 720
Non-VLT ARP Sync.........................................................................................................................................722
RSTP Configuration...............................................................................................................................................722
Preventing Forwarding Loops in a VLT Domain............................................................................................. 722
Sample RSTP Configuration........................................................................................................................... 723
Configuring VLT.............................................................................................................................................. 723
eVLT Configuration Example.................................................................................................................................732
eVLT Configuration Step Examples................................................................................................................ 733
PIM-Sparse Mode Configuration Example...........................................................................................................735
Verifying a VLT Configuration............................................................................................................................... 735
Additional VLT Sample Configurations................................................................................................................. 739
Configuring Virtual Link Trunking (VLT Peer 1)Configuring Virtual Link Trunking (VLT Peer 2)Verifying a
Port-Channel Connection to a VLT Domain (From an Attached Access Switch)...........................................739
Troubleshooting VLT.............................................................................................................................................741
Reconfiguring Stacked Switches as VLT..............................................................................................................742