Cisco Systems NME-16ES-1G manual Candidate and Member Characteristics

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Cisco EtherSwitch Service Modules Feature Guide

Information About the Cisco EtherSwitch Service Modules

If you want to maintain the same level of feature support when a standby command device takes over, it should run the same release of Cisco IOS software that the command device runs.

Candidate and Member Characteristics

Candidates are cluster-capable devices that have not yet been added to a cluster. Members are devices that have actually been added to a cluster. Although not required, a candidate or member can have its own IP address and password.

To join a cluster, a candidate must meet these requirements:

•It is running cluster-capable software.

•It has CDP version 2 enabled.

•It is not a command device or a member of another cluster.

•If a standby group exists, it is connected to every standby command device through at least one common VLAN. The VLAN to each standby command device can be different.

•It is connected to the command device through at least one common VLAN.

Automatic Discovery of Candidates and Members

The command device uses CDP to discover members, candidates, neighboring clusters, and edge devices across multiple VLANs and in star or cascaded topologies.

Note Do not disable CDP on the command device, members, or any cluster-capable devices that you might want a command device to discover.

Discovery of Candidates and Members Through CDP Hops

By using CDP, a cluster command switch can discover switches up to seven CDP hops away (the default is three hops) from the edge of the cluster. The last cluster member switches are connected to the cluster and to candidate switches at the edge of the cluster. For example, cluster member switches 9 and 10 in Figure 1 are at the edge of the cluster.

You can set the number of hops that the cluster command switch searches for candidate and cluster member switches by choosing Cluster > Hop Count. When new candidate switches are added to the network, the cluster command switch discovers them and adds them to the list of candidate switches.

Note A switch stack in a cluster equates to a single cluster member switch. There is a restriction specific to adding cluster members through Network Assistant. For more information, see the “Switch Clusters and Switch Stacks” section on page 31.

In Figure 1, the cluster command switch has ports assigned to VLANs 16 and 62. The CDP hop count is three. The cluster command switch discovers switches 11, 12, 13, and 14 because they are within three hops from the edge of the cluster. It does not discover switch 15 because it is four hops from the edge of the cluster.

Cisco IOS Release 12.2(25)SEC

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Contents Guide Release ModificationContents Network Modules Hardware Installation Guide Hardware OverviewSoftware Features and Benefits Ease-of-Use and Ease-of-Deployment Features Performance FeaturesManagement Options Manageability Features Availability FeaturesVlan Features Security Features QoS and CoS Features Power-over-Ethernet Features Monitoring FeaturesOverview of Switch Stacks Cisco StackWise ConceptsSwitch Stack Membership Stack Master Election and Re-Election Switch Stack Bridge ID and Router MAC Address Stack Member NumbersStack Member Priority Values Switch Stack Software Compatibility Recommendations Stack Protocol Version CompatibilitySwitch Stack Configuration Files Switch Stack Management Connectivity Clustering Concepts Accessing the CLI of a Specific Stack MemberManagement Connectivity to Specific Stack Members Standby Command Device Characteristics Command Device CharacteristicsCluster Compatibility Automatic Discovery of Candidates and Members Candidate and Member CharacteristicsDiscovery of Candidates and Members Through CDP Hops Vlan Discovery of Candidates and Members Through Different VLANs Switch Discovery of Candidates and Members Through Routed PortsDiscovery of Newly Installed Switches in Clusters New out-of-boxHsrp and Standby Cluster Command Switches Virtual IP Addresses in Clusters Other Considerations for Cluster Standby GroupsAutomatic Recovery of Cluster Configuration IP Addresses in Clusters Hostnames in ClustersSwitch Stack Switch Cluster Passwords in ClustersSwitch Clusters and Switch Stacks Snmp Community Strings in ClustersSwitch Stack Switch Cluster Availability of Switch-Specific Features in Switch Clusters TACACS+ and Radius in ClustersCisco IOS Release 12.225SEC Using Interface Configuration Mode Example Command or Action PurposeBoot flash image-name Dir flashConfigure terminal EnableShow running configuration Service-module interface slot/port sessionShow ip interface brief Show power inlineOutput of the show service-module status command Control+shift+6Router boot flashc2800-adventerprisek9-mz Sample Output for the dir flash Command on the RouterSample Output for the boot flash Command on the Router ExamplesRouter# service-module gigabitethernet2/0 session Router# show running config interface gigabitethernet2/0Router# configure terminal Switch dir flashSwitch# show power inline Switch# show ip interface briefSwitch# ctrl+shift+6 Sample Output for Pressing Ctrl+Shift+6 Followed byFeature Default Setting DhcpSTP Prerequisites Clustering Concepts section on Return Sample Output for Entering an Interface Name Sample Output for Assigning the IP Address and Subnet MaskSample Output for Saving the Configuration to Nvram Command or Action PurposeRouter# service-module gigabitethernet1/0 reset Router# service-module gigabitethernet1/0 shutdownRouter# service-module gigabitethernet1/0 reload Cisco IOS Release 12.225SEC Default Switch Stack Configuration RestrictionsAssigning a Stack Member Number Show switch Sample Output for the switch renumber CommandSample Output for the reload slot Command Switchconfig# switch 6 renumberSetting the Stack Member Priority Value Sample Output for the show switch CommandSwitchconfig# switch 2 priority Verifying Information About the Switch StackSample Output for the switch priority Command Switch show switchSwitch# show platform stack-manager all Switchconfig# show switch neighbors Show switch stack-portsRcommand Using the CLI to Manage Switch ClustersShow version Sample Output for the rcommand and show version Commands Sample Output for the show cluster members CommandChoose View Refresh Choose Cluster Add to Cluster or Password Cluster memberCreating a Cluster Standby Group Detailed Steps from the CLICluster standby-group HSRP-group-name Routing-redundancyNo switchport Sample Output for the ping tftpserver Command Switch# show flash Sample Output for the show flash CommandSample Output for the copy tftp flash Command Switch# copy tftp flashRecovering from a Corrupted Software Image Using Xmodem Service-module interface slot/port password-reset FlashinitFlashinit Service-module interface slot/portPassword-reset Control+6Sample Output for the copy flash xmodem Command TroubleshootingRouter# copy flash xmodem Sample Output for the copy tftp xmodem Command Router# copy tftp xmodemRouter# service-module gigabitethernet1/0 session Router# service-module gigabitethernet2/0 password-resetRecovering from a Lost or Forgotten Password Optional loadhelper filesystem/file-url Rename Boot -x -v deviceimagenameEnable secret password Copy flashCopy running-configuration startup-configuration ReloadOptional set Service-module password-reset command BootExample Sample Output for the set CommandSet Scenario Action Result Current-stack-member-number Renumber new-stack-member-number Network Configuration Examples Network Demands Suggested Design Methods Cost-Effective Wiring Closet Redundant Gigabit Backbone Cisco SoftPhone Software 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