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Configuring, LACP Priority and Rules

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Port Management Configuring Link Aggregation 9 Configuring LACP A dynamic LAG is LACP-enabled, and LACP is run on every candidate port defined in the LAG. LACP Priority and Rules LACP system priority and LACP port priority are both used to determine which of the candidate ports become active member ports in a dynamic LAG configured with more than eight candidate ports. The selected candidate ports of the LAG are all connected to the same remote device. Both the local and remote switches have a LACP system priority. The following algorithm is used to determine whether LACP port priorities are taken from the local or remote device: the local LACP System Priority is compared to the remote LACP System Priority. The device with the lowest priority controls candidate port selection to the LAG. If both priorities are the same, the local and remote MAC addresses are compared. The priority of the device with the lowest MAC address controls candidate port selection to the LAG. A dynamic LAG can have up to 16 Ethernet ports of the same type. Up to eight ports can be active, and up to eight ports can be in standby mode. When there are more than eight ports in the dynamic LAG, the switch on the controlling end of the link uses port priorities to determine which ports are bundled into the LAG and which ports are put in hot-standby mode. Port priorities on the other switch (the non-controlling end of the link) are ignored. The following are additional rules used to select the active or standby ports in a dynamic LACP: • Any link operating at a different speed from the highest-speed active member or operating at half-duplex is made standby. All the active ports in a dynamic LAG operate at the same baud rate. • If the port LACP priority of the link is lower than that of the currently-active link members, and the number of active members is already at the maximum number, the link is made inactive, and placed in standby mode. Cisco Small Business 200 Series Smart Switch Administration Guide 110

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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Port Management

Configuring Link Aggregation

Cisco Small Business 200 Series Smart Switch Administration Guide

110

Configuring

LACP

A dynamic LAG is LACP-enabled, and LACP is run on every candidate port

defined in the LAG.

LACP Priority and Rules

LACP system priority and LACP port priority are both used to determine which of

the candidate ports become active member ports in a dynamic LAG configured

with more than eight candidate ports.

The selected candidate ports of the LAG are all connected to the same remote

device. Both the local and remote switches have a LACP system priority.

The following algorithm is used to determine whether LACP port priorities are

taken from the local or remote device: the local LACP System Priority is compared

to the remote LACP System Priority. The device with the lowest priority controls

candidate port selection to the LAG. If both priorities are the same, the local and

remote MAC addresses are compared. The priority of the device with the lowest

MAC address controls candidate port selection to the LAG.

A dynamic LAG can have up to 16 Ethernet ports of the same type. Up to eight

ports can be active, and up to eight ports can be in standby mode. When there are

more than eight ports in the dynamic LAG, the switch on the controlling end of the

link uses port priorities to determine which ports are bundled into the LAG and

which ports are put in hot-standby mode. Port priorities on the other switch (the

non-controlling end of the link) are ignored.

The following are additional rules used to select the active or standby ports in a

dynamic LACP:

•

Any link operating at a different speed from the highest-speed active

member or operating at half-duplex is made standby. All the active ports in

a dynamic LAG operate at the same baud rate.

•

If the port LACP priority of the link is lower than that of the currently-active

link members, and the number of active members is already at the maximum

number, the link is made inactive, and placed in standby mode.