Reference Guide

Table Of Contents
63 Virtual LANs (VLANs)......................................................................................979
Default VLAN.....................................................................................................................................979
Port-Based VLANs............................................................................................................................ 980
VLANs and Port Tagging...................................................................................................................981
Configuration Task List..................................................................................................................... 981
Creating a Port-Based VLAN.......................................................................................................981
Assigning Interfaces to a VLAN.................................................................................................. 982
Moving Untagged Interfaces......................................................................................................984
Assigning an IP Address to a VLAN.............................................................................................985
Enabling Null VLAN as the Default VLAN...................................................................................985
Configuring Native VLANs................................................................................................................986
64 VLT Proxy Gateway........................................................................................987
Proxy Gateway in VLT Domains....................................................................................................... 987
Guidelines for Enabling the VLT Proxy Gateway.......................................................................988
Enabling the VLT Proxy Gateway............................................................................................... 989
LLDP Organizational TLV for Proxy Gateway............................................................................990
Sample Configurations for LLDP VLT Proxy Gateway.............................................................. 990
Sample Configurations for Static VLT Proxy Gateway...............................................................991
Sample Scenario for VLT Proxy Gateway...................................................................................991
Configuring an LLDP VLT Proxy Gateway....................................................................................... 992
Configuring a Static VLT Proxy Gateway.........................................................................................993
65 Virtual Link Trunking (VLT).......................................................................... 994
Overview........................................................................................................................................... 994
VLT on Core Switches................................................................................................................ 995
Multiple VLT................................................................................................................................ 996
VLT Terminology...............................................................................................................................997
Configure Virtual Link Trunking....................................................................................................... 998
Important Points to Remember................................................................................................. 998
Configuration Notes...................................................................................................................998
RSTP and VLT............................................................................................................................1002
VLT Bandwidth Monitoring.......................................................................................................1002
VLT and Stacking...................................................................................................................... 1003
VLT and IGMP Snooping...........................................................................................................1003
VLT Port Delayed Restoration.................................................................................................. 1003
PIM-Sparse Mode Support on VLT...........................................................................................1003
RSTP Configuration........................................................................................................................ 1005
Preventing Forwarding Loops in a VLT Domain......................................................................1005
Sample RSTP Configuration.....................................................................................................1006
Configuring VLT........................................................................................................................1006