Table Of Contents
Release Note for the Cisco Global Site Selector, Release 1.3(1)
January 22, 2007
Note The most current Cisco GSS documentation for released products is available on Cisco.com.
This release note applies to software version 1.3(1) for the Cisco Global Site Selector (GSS). It contains the following sections:
Cisco-Supported Hardware and Software Compatibility
GSS software version 1.3(1) installed on a GSS 4491, GSS 4490, or GSS 4480 operates with the following Cisco hardware:
•Cisco Content Services Switch (CSS) running the following WebNS software releases:
•Cisco Catalyst 6500 Content Switching Module (CSM) running the following software releases:
Platform Recommended CSM Versions 1 Minimum Supported CSM Versions
Cisco Catalyst 6500 Content Switching Module (CSM)
•3.1(10) or greater
•4.1(4) or greater
•4.2(1) or greater
1 CSM software versions 3.2(2), 3.2(3) and 4.1(2) are not supported by the GSS when using the KAL-AP by tag keepalive method.
Before Upgrading to Version 1.3(1)
You can upgrade directly to GSS software version 1.3(1) from GSS software versions: 1.2(1.0.3), 1.2(1.1.2), 1.2(2.0.3), 1.2(2.1.3), and 1.2(2.2.0). To upgrade from GSS software version 1.1(x), you must first upgrade to GSS software version 1.2(2.2.0).
Note GSS software version 1.3(1) does not allow the use of double quotes for names and associated description strings. If you have any instances of double quotes (") in object names or associated descriptions (for example, "dns rule 01" or "dns rule 02), then you must remove all double quotes before you upgrade to GSS software version 1.3(1). Follow the steps in "Upgrade Steps Required When Using Double Quotes for Object or Description Names". Also, refer to defect CSCsd52299 as described in "Software Version 1.3(1) Open Caveats" for more information.
Before you upgrade your GSS software, be sure that you:
•Perform a full backup of your primary GSSM database as described:
–For software version 1.2, refer to Chapter 7, Backing Up and Restoring the GSSM, the "Backing Up the Primary GSSM" section in the Cisco Global Site Selector Administration Guide.
–For software version 1.1, refer to Chapter 9, GSS Administration and Troubleshooting, the "Backing Up the GSSM" section in the Cisco Global Site Selector Configuration Guide.
–For software version 1.0, refer to Chapter 3, GSS Administration and Troubleshooting, the "Backing Up the GSSM" section in the Cisco Global Site Selector Configuration Guide.
•Review the software version 1.3(1) software upgrade sequence as described in the Cisco Global Site Selector Administration Guide, Appendix A, Upgrading the GSS Software.
Upgrade Steps Required When Using Double Quotes for Object or Description Names
GSS software version 1.3(1) does not allow the use of double quotes for names and associated description strings. If you have any instances of double quotes (") in object names or associated descriptions (for example, "dns rule 01" or "dns rule 02), then you must remove all double quotes before you upgrade to GSS software version 1.3(1).
Check for the use of double quotes in object names and descriptions in your GSLB configuration before proceeding.
Perform these steps to remove double quotes:
1. If you are upgrading from version 1.1(x), first upgrade to GSS software version 1.2(2.2.0). If you are upgrading from any 1.2(x) version, go to step 2.
2. Perform a full backup of your primary GSSM database. For details on backing up, refer to Chapter 7, Backing Up and Restoring the GSSM, the "Backing Up the Primary GSSM" section in the Cisco Global Site Selector Administration Guide. Provide a unique name for the backup file. Use this file if you need to downgrade to GSS software version 1.2.
3. In software version 1.2, access the GUI at the primary GSSM. Locate and remove the double quotes from any object names or associated descriptions that include any instance of double quotes.
4. Perform a full backup of your modified primary GSSM database. Provide a unique name for the backup file. You can use this file to restore your 1.2 database in the future.
5. Upgrade to GSS software version 1.3(1) as described in the Cisco Global Site Selector Administration Guide, Appendix A, Upgrading the GSS Software.
New Features in Software Version 1.3(1)
GSS software version 1.3(1) provides the following new features:
•Global server load-balancing using the CLI at the primary GSSM—GSS software version 1.3(1) includes CLI commands to configure global server load balancing for your GSS network. When you perform global server load-balancing configuration and monitoring tasks, for most tasks you now have the option to use either the CLI or the GUI on the primary GSSM. For more details, refer to the Cisco Global Site Selector CLI-Based Global Server Load-Balancing Configuration Guide.
•Creation and execution of GSLB configuration files using the CLI—New CLI commands allow you to create, modify, and execute (play) GSLB configuration files. GSLB configuration files define all global server load-balancing configuration parameters for a GSS network. For more details, refer to the Cisco Global Site Selector CLI-Based Global Server Load-Balancing Configuration Guide.
•Multi-port keepalive capability—The primary GSSM supports the assignment of multiple keepalives and/or destination ports for a single VIP answer. From either the GUI or the CLI, you have the ability to configure a maximum of five different keepalives for a VIP answer, in a mix and match configuration of ICMP, TCP, HTTP HEAD, and KAL-AP VIP keepalive types. For more details, refer to the Cisco Global Site Selector CLI-Based Global Server Load-Balancing Configuration Guide and the Cisco Global Site Selector GUI-Based Global Server Load-Balancing Configuration Guide.
Operating Considerations for Software Version 1.3(1)
The following operating considerations apply to software version 1.3(1):
•When you use a TCP keepalive with the fast detection and graceful termination methods to test a Telnet service on a server running Windows Server 2003, port 23 may fluctuate between the Up and Down state (port flapping). If port flapping occurs on TCP port 23 of Windows Server 2003, you will notice an increase in keepalive negative probe and keepalive transition counts on the Answer Keepalive Statistics list page of the primary GSSM GUI. To resolve this issue, increase the retries value for the TCP keepalive. A retry value of three or four should prevent flapping on port 23 when connecting to a server running Windows Server 2003.
Depending on the number of TCP keepalives you require to send from port 23 to servers running Windows Server 2003, specify the retries value as follows:
–If the GSS is transmitting numerous TCP keepalives using port 23, globally change the Number of Retries value for all TCP keepalives on the Configure Global KeepAlive Properties details page of the GUI. If you are using the keepalive-properties tcp fast command in the CLI to configure keepalives, change the value of the retries option.
–If TCP keepalives are being used for different devices or ports, change the Number of Retries value on a per TCP keepalive basis using the Modifying Answer detail page of the GUI. If you are using the keepalive type tcp command in the CLI to configure keepalives on a per TCP keepalive basis, change the value of the retries option.
•Cisco LocalDirector does not reply properly to TCP keepalives sent on port 23 from a GSS device. To resolve this behavior, specify a different keepalive method with LocalDirector or directly probe the servers located behind LocalDirector.
•For a GSS to successfully operate and perform DNS resolutions, a name server must be properly configured, running, and reachable by the GSS.
Documentation for GSS Software Version 1.3(1)
The documentation set for GSS software version 1.3(1) now includes the Cisco Global Site Selector CLI-Based Global Server Load-Balancing Configuration Guide. The complete documentation set contains the publications listed below.
Additional Information for Building and Modifying DNS Rules
This information augments the information provided in Chapter 7, Building and Modifying DNS Rules in the Cisco Global Site Selector GUI-Based Global Server Load Balancing Configuration Guide and the Cisco Global Site Selector CLI-Based Global Server Load Balancing Configuration Guide.
The balance clauses that you configure in a DNS rule are evaluated in order, with parameters established to determine when a clause should be skipped and the next clause is to be used. A balance clause is skipped when any one of the following conditions exits:
•A least-loaded balance method is selected and the load threshold for all online answers is exceeded.
•The VIP answers in the specified VIP answer group are offline.
•Proximity is enabled for a VIP-type answer group and the DRP agents do not return any RTT values that meet the value set for acceptable-rtt.
•All answers in a CRA- or NS-type answer group are offline and keepalives are enabled to monitor the answers.
Additional Information for Configuring DNS Sticky
This information augments the information provided in Chapter 8, Configuring DNS Sticky in the Cisco Global Site Selector GUI-Based Global Server Load Balancing Configuration Guide and the Cisco Global Site Selector CLI-Based Global Server Load Balancing Configuration Guide.
•You can configure sticky only in a DNS rule that uses a VIP-type answer group.
•Sticky is active for a DNS rule only when the following conditions exist:
–Sticky is enabled for either global or local use. In the GUI, select Global or Local for the State option in the Global Sticky Configuration details page; in the CLI, enter the enable global or enable local command.
–A sticky method option (domain or domain list) is selected. In the GUI, use the DNS Rule Builder and select By Domain or By Domain List for the Select Sticky Method option in the Create New DNS Rule window; in the CLI, enter the sticky method domain or sticky method domain list command.
–Sticky is enabled within a balance clause for the DNS rule. In the GUI, use the DNS Rule Builder and click the Sticky Enable checkbox; in the CLI, enter the sticky enable command.
Software Version 1.3(1) Open Caveats, Resolved Caveats, and Command Changes
The following sections contain the open caveats, resolved caveats, and command changes in GSS software version 1.3(1):
Software Version 1.3(1) Open Caveats
This section lists the open caveats for software version 1.3(1).
•CSCef27479—When the GSS operates as a client with a TACACS+ server, it fails to use the TACACS+ server for authentication when you perform a remote SSH login using private and public key pairs. The SSH private and public keys on the GSS perform the user authentication and take priority over a TACACS+ server. If SSH private and public key pair authentication fails, then the TACACS+ server performs user authentication.
Workaround: To use a TACACS+ server for user authentication, use the no ssh keys CLI command to disable the use of SSH key pairs on the GSS. Refer to the Cisco Global Site Selector Getting Started Guide for details on configuring the GSS for remote access over an SSH session that uses private and public key pairs for authentication.
•CSCef58474—A GSS CLI session may become unresponsive when you enter the enable command to access privileged EXEC mode from user EXEC mode. This condition may occur when there are seven or more concurrent CLI sessions running on the same GSS.
Workaround: Reduce the number of concurrent sessions running on the same GSS to less than seven by logging out of one or more CLI sessions.
•CSCef94037—The NTP service remains enabled in a GSS even if you disable the service before rebooting a GSS. Starting with software version 1.2(1) and continuing through software version 1.3(1), the ntp enable command is used to enable the NTP service on the GSS. The ntp enable command is used with the ntp-server command to synchronize the GSS system clock with an NTP time server. To preserve backwards software compatibility, the line
ntp enableis automatically added to any startup-configuration file created by a pre-GSS version 1.2(1) version of software. The re-occurrence of the line
ntp enablein the GSS startup-configuration file is caused when you define one or more NTP servers using the ntp-server command. Each time you reboot the GSS, it automatically enables the NTP service if it detects an NTP server in the startup-configuration file.
Workaround to disable NTP service on the GSS:
a. Enter the no ntp enable command to disable the NTP service.gss1.yourdomain.com# no ntp enable
b. Enter the no ntp-server command to disable all configured NTP servers.gss1.example.com(config)# no ntp-server 192.168.0.1 126.96.36.199
•CSCeg10406—Using the gssm restore command to restore the primary GSSM from the backup file may result in a misconfiguration of the keepalive engine and DNS server on the standby GSSM or GSS devices. This behavior is caused as a result of the newly restored configuration not properly overwriting the previous configuration on the primary GSSM.
The following logs are symptoms of a misconfiguration in either the keepalive engine or DNS server:KAL-4-KALSTATSNOGID Could not find KAL-GID KAL-4-KALGIDNOTFOUND kalDeleteVip: No KAL-GID found, removing based on GID : successCRD-4-ANSWERNOTEXT answer id 214 doesn't exist in selector but in kale
The presence of a core file in the /core-files/keepalive and /core-files/dnsserver is evidence of this problem.
Workaround: Ensure the standby GSSM and all GSS devices have network connectivity with the primary GSSM, then perform the following procedure:
a. Log on to the CLI of the standby GSSM or a GSS.
b. Enable privileged EXEC mode.gss1.yourdomain.com> enablegss1.yourdomain.com#
c. Determine if the node.state file is present in the / directory. If it is not present, proceed to step g.gss1.yourdomain.com# cd /gss1.yourdomain.com# ls
d. If the node.state file is present in the / directory, enter the gss stop command to stop your GSS server.gss1.yourdomain.com# gss stop
e. Delete the node.state file.gss1.yourdomain.com# del node.stategss1.yourdomain.com# cd /home
f. Enter the gss start command to force the standby GSSM or GSS to retrieve a new and complete configuration from the primary GSSM.gss1.yourdomain.com# gss start
g. Repeat this procedure for each GSS device in your network.
•CSCeh89311—When configuring a GSS device as a standby GSSM using the gss enable gss-standby command, the standby GSSM may fail to register with the primary GSSM. This behavior is caused if either of the following condition exists:
–There is no valid name server IP address configured on the standby GSSM
–There is more than one invalid name server IP address configured on the standby GSSM (in addition to a valid name server IP address)
Workaround: Ensure the standby GSSM is configured with a valid name server IP address. Additionally, ensure that there is no more than one invalid name server IP address configured on the standby GSSM.
•CSCsb96262—In certain GSS configurations, the primary GSSM exhibits delays in its DNS resolution process. This delay can also be seen in slow GUI responses (30 to 45 seconds) when attempting to switch from one tab to another. This behavior occurs when the primary and standby GSSM reside in the same subdomain as the name server to which they are configured, and the primary GSSM needs to resolve the hostname request for the standby GSSM. Because the name server is not authoritative for the subdomain (the primary and standby GSSMs are), the name server is unable to resolve the hostname request and a looping effect is created.
Workaround 1: Configure your GSS network so that the primary GSSM and the standby GSSM reside in a subdomain that is different from the subdomain in which the answers they resolve for reside. This configuration allows the name server configured for the primary and standby GSSM to answer the primary GSSM's hostname request for the standby GSSM.
Workaround 2: Create a DNS rule at the primary GSSM that enables the primary GSSM to provide an answer to its DNS query for the standby GSSM. The DNS rule must include the following elements:
–A domain list that provides the fully qualified domain name for the standby GSSM
–An answer that includes the IP address of the standby GSSM and specifies a keepalive type of None
–An answer group that includes only the answer created in the previous step
–A DNS rule
•CSCsc71389—The GSS exhibits an unexpected 2:1 load distribution (where a 1:1 load distribution is expected) under certain DNS rule configurations. The following DNS rule configuration can result in a 2:1 load distribution:
–A Hashed method type is selected in the balance clause of the DNS rule
–The answer group specified in the balance clause contains only two answers
•CSCsc99070—When the GSS performs an SNMPwalk on UCD-SNMP-MIB (OID 188.8.131.52.184.108.40.2061), it jumps from OID 2021.4.x to 2021.10.x. Because these omitted OIDs contain disk partition information, the information is not available using SNMP.
•CSCsd08995—TACACS+ authentication fails when attempting an SSH login when the GSS password and the TACACS+ password differ.
Workaround: Ensure that the GSS and TACACS+ server passwords are identical.
•CSCsd15405—The GSS does not authenticate TACACS+ users if both of the following conditions exist:
–The Group-Level Password Aging checkbox is enabled (in the Advanced Options page of the Interface Configuration section in the Cisco Secure ACS HTML interface)
–The password aging period has expired (the password warning period is active)
Workaround 1: Disable the Group-Level Password Aging checkbox.
Workaround 2: If Group-Level Password Aging is required, reset the user password (when prompted) at both the GSS CLI and the TACACS+ server. Ensure that the passwords are identical.
•CSCsd31646—The clock timezone command allows you to select standard Universal Time Coordinated (UTC) timezones for your GSS. However, if you need to specify an offset to your standard timezone (for example, daylight savings time arrives early for your region), you must manually set the GSS time.
Workaround: Use the clock set command to manually set a time for each GSS device. For example:gss1.example.com# clock set 13:01:05 march 26 2006
•CSCsd36425—The GSS returns an incorrect administrative status to an SNMP management station for GSS interface eth0 or eth1 when an interface is not configured with an IP address. The incorrect status is returned as "administratively-UP" and as "operationally-DOWN." For example:interfaces.ifTable.ifEntry.ifAdminStatus.3 - up(1)interfaces.ifTable.ifEntry.ifOperStatus.3 - down(2)
•CSCsd48703—When executing the script play-config command to play a GSLB configuration file and a name server is not properly configured, the GSS CLI becomes unavailable and the Content Router Manager (CRM) may automatically restart. In some cases, the CLI becomes available again after a few minutes; in other cases, you must restart the GSS using the gss stop and gss start command sequence.
An example CRM error message follows:Feb 25 02:07:47 CRM-3-EXCEPTION java.lang.InternalError: verify() failed java.lang.InternalError: verify() failed at com.sightpath.merlot.util.Asserter.internalError(Asserter.java:62) at com.sightpath.merlot.util.Asserter.verify(Asserter.java:41) at com.sightpath.merlot.servantCLI.CliAdapter.healthyOrDie(CliAdapter.java:178) at com.sightpath.merlot.server.AServer.modulesHealthyOrDie(AServer.java:865) at com.sightpath.merlot.server.AServer.healthCheck(AServer.java:875) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source) at sun.rmi.transport.Transport$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Unknown Source) at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Dumping stack for crm at Sat Feb 25 02:07:48 GMT 2006 Starting crm: Sat Feb 25 02:07:51 UTC 2006 [(4766)] Store is already upgraded. controller.storeUpgrade Done. runUpgrade: spjava controller.storeUpgrade --upgrade
Workaround: Properly configure a name server in the GSS network.
•CSCsd50568—When a primary GSSM has been upgraded to GSS software version 1.3(1), but other GSS devices remain at version 1.2(1.1.2) or 1.2(2.0.3), global server load-balancing configuration settings are not propagated to the GSS devices still at version 1.2(1.1.2) or 1.2(2.0.3).
Workaround: Ensure that all GSS devices on the network are upgraded to GSS software version 1.3(1) before you configure global server load balancing.
•CSCsd52299—GSS software version 1.3(1) does not allow the use of double quotes for names and associated description strings. If you have any instances of double quotes (") in object names or associated descriptions (for example, "dns rule 01" or "dns rule 02), then you must remove all double quotes before you upgrade to GSS software version 1.3(1).
Workaround: Remove all instances of double quotes in object names and associated descriptions by following the steps in "Upgrade Steps Required When Using Double Quotes for Object or Description Names".
Software Version 1.3(1) Resolved Caveats
This section lists the resolved caveats for software version 1.3(1).
•CSCei10099—GSS software versions 1.2(1.1.2) and 1.2(2) fail to exchange configuration and statistic updates with GSS devices running GSS software version 1.2(1.0.3) or an earlier version. When this software version mismatch occurs, a GSS device running an incompatible software version fails to receive configuration updates from the primary GSSM. In addition, the primary GSSM GUI does not update operating status and statistics for the GSS device. Although configuration updates do not occur between the devices, each GSS device continues to answer DNS requests and perform keepalive operations based on its current configuration.
•CSCsc18321—The GSS directs all queries to the lower-weighted answer when using the following combination of global server load-balancing parameters:
–Two configured answers
–Weighted Round Robin balance method
–VIP KAL-AP keepalive type
–Standard failure detection mode
Software Version 1.3(1) CLI Command Updates
Table 1 lists the new commands in GSS software version 1.3(1). For detailed information on how the new CLI commands are used for global server load balancing, refer to the Cisco Global Site Selector CLI-Based Global Server Load-Balancing Configuration Guide chapters that are specified in Table 1. For detailed descriptions of all CLI commands in the GSS software, refer to the Cisco Global Site Selector Command Reference.
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