iv
Modifying a VLAN interface ······································································································································· 135
Configuring a voice VLAN ····································································································································· 137
Overview ······································································································································································· 137
OUI addresses ····················································································································································· 137
Voice VLAN assignment modes ························································································································· 137
Security mode and normal mode of voice VLANs ··························································································· 139
Configuration guidelines ············································································································································· 140
Recommended voice VLAN configuration procedure ······························································································ 140
Configuring voice VLAN globally ······························································································································ 141
Configuring voice VLAN on ports ······························································································································ 142
Adding OUI addresses to the OUI list ······················································································································· 143
Voice VLAN configuration examples ························································································································· 144
Configuring voice VLAN on a port in automatic voice VLAN assignment mode ········································· 144
Configuring voice VLAN on a port in manual voice VLAN assignment mode ············································· 149
Configuring the MAC address table ····················································································································· 156
Overview ······································································································································································· 156
How a MAC address entry is created ·············································································································· 156
Types of MAC address entries ··························································································································· 156
MAC address table-based frame forwarding ·································································································· 157
Displaying and configuring MAC address entries ··································································································· 157
Setting the aging time of MAC address entries ········································································································ 159
MAC address table configuration example ·············································································································· 160
Configuring MSTP ··················································································································································· 161
Overview ······································································································································································· 161
Why MSTP ···································································································································································· 161
STP and RSTP limitations ····································································································································· 161
Features of MSTP ················································································································································· 161
Basic concepts in MSTP ··············································································································································· 162
MST region ··························································································································································· 162
VLAN-to-MSTI mapping table ····························································································································· 163
IST ········································································································································································· 163
CST········································································································································································ 163
CIST ······································································································································································· 163
MSTI ······································································································································································ 163
Regional root bridge ··········································································································································· 163
Common root bridge··········································································································································· 164
Boundary port ······················································································································································ 164
Port roles ······························································································································································· 164
Port states ····························································································································································· 165
How MSTP works ························································································································································· 166
CIST calculation ··················································································································································· 166
MSTI calculation ·················································································································································· 166
MSTP implementation on devices ······························································································································· 166
Protocols and standards ·············································································································································· 166
Configuration guidelines ············································································································································· 167
Recommended MSTP configuration procedure ········································································································· 167
Configuring an MST region ········································································································································ 167
Configuring MSTP globally ········································································································································· 169
Configuring MSTP on a port ······································································································································· 171
Displaying MSTP information for a port ···················································································································· 173
MSTP configuration example ······································································································································ 176
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