Contents
vii
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-08
Hardware Loopback Example: LINK OK event 5-30
Hardware Loop Example: LINK NOT OK Event 5-31
Finding a Disconnected Stack Cable 5-32
Fixing a Bad Connection Between Stack Ports 5-33
CHAPTER
6 Clustering Switches 6-1
Understanding Switch Clusters 6-2
Cluster Command Switch Characteristics 6-3
Standby Cluster Command Switch Characteristics 6-3
Candidate Switch and Cluster Member Switch Characteristics 6-4
Planning a Switch Cluster 6-4
Automatic Discovery of Cluster Candidates and Members 6-5
Discovery Through CDP Hops 6-5
Discovery Through Non-CDP-Capable and Noncluster-Capable Devices 6-6
Discovery Through Different VLANs 6-7
Discovery Through Different Management VLANs 6-7
Discovery Through Routed Ports 6-8
Discovery of Newly Installed Switches 6-9
HSRP and Standby Cluster Command Switches 6-10
Virtual IP Addresses 6-11
Other Considerations for Cluster Standby Groups 6-11
Automatic Recovery of Cluster Configuration 6-12
IP Addresses 6-13
Hostnames 6-13
Passwords 6-14
SNMP Community Strings 6-14
Switch Clusters and Switch Stacks 6-14
TACACS+ and RADIUS 6-16
LRE Profiles 6-16
Using the CLI to Manage Switch Clusters 6-16
Catalyst 1900 and Catalyst 2820 CLI Considerations 6-17
Using SNMP to Manage Switch Clusters 6-17
CHAPTER
7 Administering the Switch 7-1
Managing the System Time and Date 7-1
Understanding the System Clock 7-2
Understanding Network Time Protocol 7-2
Configuring NTP 7-4
Default NTP Configuration 7-4
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