Cisco Systems NME-16ES-1G manual Hsrp and Standby Cluster Command Switches

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Cisco EtherSwitch Service Modules Feature Guide

Information About the Cisco EtherSwitch Service Modules

HSRP and Standby Cluster Command Switches

The switch supports Hot Standby Router Protocol (HSRP) so that you can configure a group of standby cluster command switches. Because a cluster command switch manages the forwarding of all communication and configuration information to all the cluster member switches, we strongly recommend the following:

•For a cluster command switch stack, a standby cluster command switch is necessary if the entire switch stack fails. However, if only the stack master in the command switch stack fails, the switch stack elects a new stack master and resumes its role as the cluster command switch stack.

•For a cluster command switch that is a standalone switch, configure a standby cluster command switch to take over if the primary cluster command switch fails.

A cluster standby group is a group of command-capable switches that meet the requirements described in the “Standby Command Device Characteristics” section on page 21. Only one cluster standby group can be assigned per cluster.

Note If the switch cluster has a Cisco EtherSwitch service module, Catalyst 3750 switch, or switch stack, that switch or switch stack must be the cluster command switch.

Note The cluster standby group is an HSRP group. Disabling HSRP disables the cluster standby group.

•The switches in the cluster standby group are ranked according to HSRP priorities. The switch with the highest priority in the group is the active cluster command switch (AC). The switch with the next highest priority is the standby cluster command switch (SC). The other switches in the cluster standby group are the passive cluster command switches (PC). If the active cluster command switch and the standby cluster command switch become disabled at the same time, the passive cluster command switch with the highest priority becomes the active cluster command switch. For the limitations to automatic discovery, see the “Automatic Recovery of Cluster Configuration” section on page 29. For information about changing HSRP priority values, see the Catalyst 3750 Switch Software Configuration Guide, Cisco IOS Release 12.2 at http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/index.htm. The HSRP standby priority interface configuration commands are the same for changing the priority of cluster standby group members and router-redundancy group members.

Note The HSRP standby hold time interval should be greater than or equal to three times the hello time interval. The default HSRP standby hold time interval is 10 seconds. The default HSRP standby hello time interval is 3 seconds. For more information about the standby hold time and standby hello time intervals, see the Catalyst 3750 Switch Software Configuration Guide, Cisco IOS Release 12.2 at http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/index.htm.

These connectivity guidelines ensure automatic discovery of the switch cluster, cluster candidates, connected switch clusters, and neighboring edge devices. These topics also provide more detail about standby cluster command switches:

•Virtual IP Addresses in Clusters, page 28

•Other Considerations for Cluster Standby Groups, page 28

•Automatic Recovery of Cluster Configuration, page 29

Cisco IOS Release 12.2(25)SEC

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Contents Release Modification GuideContents Hardware Overview Network Modules Hardware Installation GuideSoftware Features and Benefits Performance Features Ease-of-Use and Ease-of-Deployment FeaturesManagement Options Availability Features Manageability FeaturesVlan Features Security Features QoS and CoS Features Monitoring Features Power-over-Ethernet FeaturesCisco StackWise Concepts Overview of Switch StacksSwitch Stack Membership Stack Master Election and Re-Election Stack Member Numbers Switch Stack Bridge ID and Router MAC AddressStack Member Priority Values Stack Protocol Version Compatibility Switch Stack Software Compatibility RecommendationsSwitch Stack Configuration Files Switch Stack Management Connectivity Accessing the CLI of a Specific Stack Member Clustering ConceptsManagement Connectivity to Specific Stack Members Command Device Characteristics Standby Command Device CharacteristicsCluster Compatibility Candidate and Member Characteristics Automatic Discovery of Candidates and MembersDiscovery of Candidates and Members Through CDP Hops Vlan Discovery of Candidates and Members Through Different VLANs Discovery of Candidates and Members Through Routed Ports SwitchNew out-of-box Discovery of Newly Installed Switches in ClustersHsrp and Standby Cluster Command Switches Other Considerations for Cluster Standby Groups Virtual IP Addresses in ClustersAutomatic Recovery of Cluster Configuration Hostnames in Clusters IP Addresses in ClustersSnmp Community Strings in Clusters Passwords in ClustersSwitch Clusters and Switch Stacks Switch Stack Switch ClusterSwitch Stack Switch Cluster TACACS+ and Radius in Clusters Availability of Switch-Specific Features in Switch ClustersCisco IOS Release 12.225SEC Using Interface Configuration Mode Dir flash Command or Action PurposeBoot flash image-name ExampleService-module interface slot/port session EnableShow running configuration Configure terminalControl+shift+6 Show power inlineOutput of the show service-module status command Show ip interface briefExamples Sample Output for the dir flash Command on the RouterSample Output for the boot flash Command on the Router Router boot flashc2800-adventerprisek9-mzSwitch dir flash Router# show running config interface gigabitethernet2/0Router# configure terminal Router# service-module gigabitethernet2/0 sessionSample Output for Pressing Ctrl+Shift+6 Followed by Switch# show ip interface briefSwitch# ctrl+shift+6 Switch# show power inlineDhcp Feature Default SettingSTP Prerequisites Clustering Concepts section on Return Sample Output for Assigning the IP Address and Subnet Mask Sample Output for Entering an Interface NameCommand or Action Purpose Sample Output for Saving the Configuration to NvramRouter# service-module gigabitethernet1/0 shutdown Router# service-module gigabitethernet1/0 resetRouter# service-module gigabitethernet1/0 reload Cisco IOS Release 12.225SEC Restrictions Default Switch Stack ConfigurationAssigning a Stack Member Number Switchconfig# switch 6 renumber Sample Output for the switch renumber CommandSample Output for the reload slot Command Show switchSample Output for the show switch Command Setting the Stack Member Priority ValueSwitch show switch Verifying Information About the Switch StackSample Output for the switch priority Command Switchconfig# switch 2 prioritySwitch# show platform stack-manager all Show switch stack-ports Switchconfig# show switch neighborsUsing the CLI to Manage Switch Clusters RcommandShow version Sample Output for the show cluster members Command Sample Output for the rcommand and show version CommandsChoose View Refresh Choose Cluster Add to Cluster or Cluster member PasswordDetailed Steps from the CLI Creating a Cluster Standby GroupRouting-redundancy Cluster standby-group HSRP-group-nameNo switchport Sample Output for the ping tftpserver Command Switch# copy tftp flash Sample Output for the show flash CommandSample Output for the copy tftp flash Command Switch# show flashService-module interface slot/port password-reset Flashinit Recovering from a Corrupted Software Image Using XmodemControl+6 Service-module interface slot/portPassword-reset FlashinitTroubleshooting Sample Output for the copy flash xmodem CommandRouter# copy flash xmodem Router# copy tftp xmodem Sample Output for the copy tftp xmodem CommandRouter# service-module gigabitethernet2/0 password-reset Router# service-module gigabitethernet1/0 sessionRecovering from a Lost or Forgotten Password Optional loadhelper filesystem/file-url Copy flash Boot -x -v deviceimagenameEnable secret password RenameReload Copy running-configuration startup-configurationOptional set Boot Service-module password-reset commandSample Output for the set Command ExampleSet 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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