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Cisco SR224T Administration Guide - Page 167

Voice End-Points, Auto Voice VLAN, Auto Smartports, CDP, and LLDP, Defaults, Voice VLAN Triggers

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VLAN Management Voice VLAN 12 Unlike Telephony OUI mode that detects voice devices based on telephony OUI, Auto Voice VLAN mode depends on Auto Smartport to dynamically add the ports to the voice VLAN. Auto Smartport, if enabled, adds a port to the voice VLAN if it detects an attaching device to the port that advertises itself as a phone or media end points through CDP and/or LLDP-MED. Voice End-Points To have a voice VLAN work properly, the voice devices, such as Cisco phones and VoIP endpoints, must be assigned to the voice VLAN where it sends and receives its voice traffic. Some of the possible scenarios are as follows: • A phone/endpoint may be statically configured with the voice VLAN. • A phone/endpoint may obtain the voice VLAN in the boot file it downloads from a TFTP server. A DHCP server may specify the boot file and the TFTP server when it assigns an IP address to the phone. • A phone/endpoint may obtain the voice VLAN information from CDP and LLDP-MED advertisements it receives from their neighbor voice systems and switches. The switch expects the attaching voice devices to send voice VLAN, tagged packets. On ports where the voice VLAN is also the native VLAN, voice VLAN untagged packets are possible. Auto Voice VLAN, Auto Smartports, CDP, and LLDP Defaults By factory defaults, CDP, LLDP, and LLDP-MED on the switch are enabled, auto Smartport mode is enabled, Basic QoS with trusted DSCP is enabled, and all ports are members of default VLAN 1, which is also the default Voice VLAN. In addition, Dynamic Voice VLAN mode is the default to Auto Voice VLAN with enabling based on trigger, and Auto Smartport is the default to be enabled depending on Auto Voice VLAN. Voice VLAN Triggers When the Dynamic Voice VLAN mode is Enable Auto Voice VLAN, Auto Voice VLAN becomes operational only if one or more triggers occur. Possible triggers are static voice VLAN configuration, voice VLAN information received in neighbor CDP advertisement, and voice VLAN information received in the Voice VLAN Discovery Protocol (VSDP). If desired, you can activate Auto Voice VLAN immediately without waiting for a trigger. Cisco Small Business 200 Series Smart Switch Administration Guide 168

Section	Page
Getting Started	7
Starting the Web-based Switch Configuration Utility	7
Quick Start Switch Configuration	11
Interface Naming Conventions	11
Window Navigation	13
Viewing Statistics	17
Viewing Ethernet Interfaces	17
Viewing Etherlike Statistics	18
Viewing 802.1X EAP Statistics	19
Managing RMON	21
Managing System Logs	24
Setting System Log Settings	24
Setting Remote Logging Settings	26
Viewing Memory Logs	27
Managing System Files	29
Types of System Files	29
Upgrade/Backup Firmware/Language	32
Downloading or Backing-up a Configuration or Log	34
Viewing Configuration Files Properties	37
Copying Configuration Files	38
DHCP Auto Configuration	39
General Administrative Information	43
Switch Models	43
System Information	45
Rebooting the Switch	47
Monitoring the Fan Status and Temperature	48
Defining Idle Session Timeout	48
Pinging a Host	49
System Time	51
System Time Options	52
SNTP Modes	53
Configuring System Time	54
Managing Device Diagnostics	61
Testing Copper Ports	61
Displaying Optical Module Status	63
Configuring Port and VLAN Mirroring	64
Viewing CPU Utilization and Secure Core Technology	66
Configuring Discovery	68
Configuring Bonjour Discovery	68
LLDP and CDP	69
Configuring LLDP	70
Configuring CDP	91
Port Management	100
Configuring Ports	100
Setting Basic Port Configuration	101
Configuring Link Aggregation	103
Configuring Green Ethernet	111
Smartports	118
Overview	118
What is a Smartport	119
Smartport Types	119
Smartport Macros	122
Macro Failure and the Reset Operation	123
How the Smartport Feature Works	124
Auto Smartport	124
Error Handling	128
Default Configuration	128
Relationships with Other Features and Backwards Compatibility	129
Common Smartport Tasks	129
Configuring Smartport Using The Web-based Interface	131
Built-in Smartport Macros	136
Managing Power-over-Ethernet Devices	148
PoE on the Switch	148
Configuring PoE Properties	151
Configuring the PoE Power, Priority, and Class	152
VLAN Management	155
VLANs	155
Configuring Default VLAN Settings	158
Creating VLANs	159
Configuring VLAN Interface Settings	160
Defining VLAN Membership	161
Voice VLAN	165
Configuring the Spanning Tree Protocol	179
STP Flavors	179
Configuring STP Status and Global Settings	180
Defining Spanning Tree Interface Settings	182
Configuring Rapid Spanning Tree Settings	184
Managing MAC Address Tables	187
Configuring Static MAC Addresses	188
Managing Dynamic MAC Addresses	188
Configuring Multicast Forwarding	190
Multicast Forwarding	190
Defining Multicast Properties	193
Adding MAC Group Address	195
Adding IP Multicast Group Addresses	197
Configuring IGMP Snooping	198
MLD Snooping	200
Querying IGMP/MLD IP Multicast Group	203
Defining Multicast Router Ports	204
Defining Forward All Multicast	205
Defining Unregistered Multicast Settings	206
Configuring IP Information	207
Management and IP Interfaces	207
Configuring ARP	219
Domain Name Systems	220
Configuring Security	224
Defining Users	225
Configuring RADIUS	228
Configuring Management Access Authentication	230
Defining Management Access Method	231
Configuring TCP/UDP Services	236
Defining Storm Control	237
Configuring Port Security	238
Configuring 802.1X	241
Denial of Service Prevention	247
Using the SSL Feature	249
SSL Overview	249
Default Settings and Configuration	249
SSL Server Authentication Settings	250
Secure Sensitive Data	252
Introduction	252
SSD Rules	253
SSD Properties	258
Configuration Files	261
SSD Management Channels	266
Menu CLI and Password Recovery	266
Configuring SSD	267
Configuring Quality of Service	270
QoS Features and Components	271
Configuring QoS - General	272

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VLAN Management

Voice VLAN

Cisco Small Business 200 Series Smart Switch Administration Guide

168

Unlike Telephony OUI mode that detects voice devices based on telephony

OUI, Auto Voice VLAN mode depends on Auto Smartport to dynamically

add the ports to the voice VLAN.

Auto Smartport, if enabled, adds a port to

the voice VLAN if it detects an attaching device to the port that advertises

itself as a phone or media end points through CDP and/or LLDP-MED.

Voice End-Points

To have a voice VLAN work properly, the voice devices, such as Cisco phones and

VoIP endpoints, must be assigned to the voice VLAN where it sends and receives

its voice traffic. Some of the possible scenarios are as follows:

•

A phone/endpoint may be statically configured with the voice VLAN.

•

A phone/endpoint may obtain the voice VLAN in the boot file it downloads

from a TFTP server. A DHCP server may specify the boot file and the TFTP

server when it assigns an IP address to the phone.

•

A phone/endpoint may obtain the voice VLAN information from CDP and

LLDP-MED advertisements it receives from their neighbor voice systems

and switches.

The switch expects the attaching voice devices to send voice VLAN, tagged

packets. On ports where the voice VLAN is also the native VLAN, voice VLAN

untagged packets are possible.

Auto Voice VLAN, Auto Smartports, CDP, and LLDP

Defaults

By factory defaults, CDP, LLDP, and LLDP-MED on the switch are enabled, auto

Smartport mode is enabled, Basic QoS with trusted DSCP is enabled, and all ports

are members of default VLAN 1, which is also the default Voice VLAN.

In addition, Dynamic Voice VLAN mode is the default to Auto Voice VLAN with

enabling based on trigger, and Auto Smartport is the default to be enabled

depending on Auto Voice VLAN.

Voice VLAN Triggers

When the Dynamic Voice VLAN mode is Enable Auto Voice VLAN, Auto Voice

VLAN becomes operational only if one or more triggers occur.

Possible triggers

are static voice VLAN configuration, voice VLAN information received in neighbor

CDP advertisement, and voice VLAN information received in the Voice VLAN

Discovery Protocol (VSDP). If desired, you can activate Auto Voice VLAN

immediately without waiting for a trigger.