Setup Guide

Table Of Contents
Configuration Task List..................................................................................................................................................883
Creating a Port-Based VLAN................................................................................................................................. 883
Assigning Interfaces to a VLAN.............................................................................................................................884
Moving Untagged Interfaces..................................................................................................................................885
Assigning an IP Address to a VLAN......................................................................................................................886
Configuring Native VLANs............................................................................................................................................886
Enabling Null VLAN as the Default VLAN..................................................................................................................887
Chapter 61: Virtual Link Trunking (VLT).................................................................................... 888
Overview...........................................................................................................................................................................888
VLT Terminology....................................................................................................................................................... 890
Layer-2 Traffic in VLT Domains............................................................................................................................. 891
Interspersed VLANs..................................................................................................................................................892
VLT on Core Switches............................................................................................................................................. 892
Enhanced VLT............................................................................................................................................................893
Configure Virtual Link Trunking...................................................................................................................................894
Important Points to Remember............................................................................................................................. 894
Configuration Notes................................................................................................................................................. 895
Primary and Secondary VLT Peers....................................................................................................................... 898
RSTP and VLT........................................................................................................................................................... 898
VLT Bandwidth Monitoring.....................................................................................................................................899
VLT and Stacking......................................................................................................................................................899
VLT and IGMP Snooping.........................................................................................................................................899
VLT IPv6......................................................................................................................................................................899
VLT Port Delayed Restoration............................................................................................................................... 899
PIM-Sparse Mode Support on VLT...................................................................................................................... 900
VLT Routing ............................................................................................................................................................... 901
Non-VLT ARP Sync.................................................................................................................................................. 904
RSTP Configuration....................................................................................................................................................... 904
Preventing Forwarding Loops in a VLT Domain................................................................................................ 905
Sample RSTP configuration................................................................................................................................... 905
Configuring VLT........................................................................................................................................................ 906
PVST+ Configuration......................................................................................................................................................914
Peer Routing Configuration Example..........................................................................................................................915
Dell-1 Switch Configuration.....................................................................................................................................916
Dell-2 Switch Configuration................................................................................................................................... 920
R1 Configuration........................................................................................................................................................ 923
Access Switch A1 Configurations and Verification........................................................................................... 924
eVLT Configuration Example........................................................................................................................................924
PIM-Sparse Mode Configuration Example................................................................................................................927
Verifying a VLT Configuration......................................................................................................................................927
Additional VLT Sample Configurations...................................................................................................................... 930
Troubleshooting VLT......................................................................................................................................................932
Reconfiguring Stacked Switches as VLT.................................................................................................................. 933
Specifying VLT Nodes in a PVLAN............................................................................................................................. 933
Configuring a VLT VLAN or LAG in a PVLAN.......................................................................................................... 937
Creating a VLT LAG or a VLT VLAN.....................................................................................................................937
Associating the VLT LAG or VLT VLAN in a PVLAN........................................................................................938
Proxy ARP Capability on VLT Peer Nodes................................................................................................................938
VLT Nodes as Rendezvous Points for Multicast Resiliency................................................................................. 939
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