Table Of Contents
Cisco MDS 9000 Family Release Notes
for Cisco MDS SAN-OS Release 3.0(3b)Determining the Software Version
Selecting the Correct Software Image for an MDS 9500 Series Switch
Migrating from Supervisor-1 Modules to Supervisor-2 Modules
Configuring Generation 2 Switching Modules
Upgrading Your Cisco MDS SAN-OS Software Image
Performing a Nondisruptive Software Upgrade on Generation 1 Modules
Reconfiguring SSM Ports Before Upgrading to SAN-OS Release 3.0(3b)
Upgrading the SSI Image on Your SSM
Downgrading Your Cisco MDS SAN-OS Software Image
General Downgrading Guidelines
Downgrading your SSI Image on Your SSM
New Features in Cisco MDS SAN-OS Release 3.0(3b)
Virtual Router Redundancy Protocol (VRRP) Interfaces
Regulatory Compliance and Safety Information
Installation and Configuration Note
Obtaining Documentation, Obtaining Support, and Security Guidelines
Cisco MDS 9000 Family Release Notes
for Cisco MDS SAN-OS Release 3.0(3b)
Release Date: May 07, 2007
Text Part Number: OL-8795-06 I0
This document describes the caveats and limitations for switches in the Cisco MDS 9000 Family. Use this document in conjunction with documents listed in the "Related Documentation" section.
Note
Release notes are sometimes updated with new information on restrictions and caveats. Refer to the following website for the most recent version of the Cisco MDS 9000 Family Release Notes: http://www.cisco.com/en/US/products/hw/ps4159/ps4358/prod_release_notes_list.html
Table 1 shows the on-line change history for this document.
Table 1 Online History Change
A0
05/07/2007
Created release notes
B0
06/11/2007
Added DDTS CSCsi27133 and CSCsi33540.
C0
07/18/2007
Added DDTS CSCsj04224, CSCsj07363, and CSCsj19105.
Removed DDTS CSCei82909.
D0
08/24/2007
Added DDTS CSCsh95415.
E0
09/28/2007
Added DDTS CSCeh35635, CSCsh05721, CSCsi49231, and CSCsj65565.
F0
10/23/2007
Removed DDTS CSCsh31236.
Added a Note about downgrading from Cisco SAN-OS Release 3.2(1) to the "Downgrading Your Cisco MDS SAN-OS Software Image" section.
G0
04/30/2008
Added DDTS CSCso63465.
H0
11/13/2008
Added the "Performing a Nondisruptive Software Upgrade on Generation 1 Modules" section.
I0
11/18/2008
Added DDTS CSCso72230.
Contents
This document includes the following sections:
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Introduction
The Cisco MDS 9000 Family of Multilayer Directors and Fabric Switches provides industry-leading availability, scalability, security, and management, allowing you to deploy high performance storage-area networks with lowest total cost of ownership. Layering a rich set of intelligent features onto a high performance, protocol agnostic switch fabric, the Cisco MDS 9000 Family addresses the stringent requirements of large data center storage environments: uncompromising high availability, security, scalability, ease of management, and seamless integration of new technologies.
The Cisco MDS 9000 Family SAN-OS is the underlying system software that powers the Cisco MDS 9500 Series, 9200 Series, and 9100 Series multilayer switches. The Cisco SAN-OS provides intelligent networking features, such as multiprotocol and multitransport integration, virtual SANs (VSANs), advanced security, sophisticated debug analysis tools, and unified SAN management.
Components Supported
Table 2 lists the SAN-OS software part number and hardware components supported by the Cisco MDS 9000 Family.
Note
Table 2 Cisco MDS 9000 Family Supported Software and Hardware Components
Software
Not orderable.
MDS 9500 Supervisor/Fabric-2, SAN-OS software.
MDS 9500 Series only
Not orderable.
MDS 9500 Supervisor/Fabric-I, SAN-OS software.
MDS 9500 Series only
Not orderable.
MDS 9216 Supervisor/Fabric-I, SAN-OS software.
MDS 9200 Series only
Not orderable.
MDS 9100 Supervisor/Fabric-I, SAN-OS software.
MDS 9100 Series only
License
M9500ENT1K9
Enterprise package.
MDS 9500 Series
M9200ENT1K9
Enterprise package.
MDS 9200 Series
M9100ENT1K9
Enterprise package.
MDS 9100 Series
M9500FIC1K9
Mainframe package.
MDS 9500 Series
M9200FIC1K9
Mainframe package.
MDS 9200 Series
M9100FIC1K9
Mainframe package.
MDS 9100 Series
M9500FMS1K9
Fabric Manager Server package.
MDS 9500 Series
M9200FMS1K9
Fabric Manager Server package.
MDS 9200 Series
M9100FMS1K9
Fabric Manager Server package.
MDS 9100 Series
M9500EXT1K9
SAN Extension over IP package for IPS-8 module.
MDS 9500 Series
M9200EXT1K9
SAN Extension over IP package for IPS-8 module.
MDS 9200 Series
M9500EXT14K9
SAN Extension over IP package for IPS-4 module.
MDS 9500 Series
M9200EXT14K9
SAN Extension over IP package for IPS-4 module.
MDS 9200 Series
M9500EXT12K9
SAN Extension over IP package for MPS 14+2 module.
MDS 9500 Series
M9200EXT12K9
SAN Extension over IP package for MPS 14+2 module.
MDS 9200 Series
M9500SSE1K9
Storage Services Enabler package.
MDS 9500 Series with SSM
M9200SSE1K9
Storage Services Enabler package.
MDS 9200 Series with SSM
Chassis
DS-C9513
MDS 9513 director (13-slot modular chassis with 11 slots for switching modules, and 2 slots reserved for Supervisor 2 modules only—SFPs1 sold separately).
MDS 9513 only
DS-C9509
MDS 9509 director, base configuration (9-slot modular chassis includes 7 slots for switching modules and 2 slots for supervisor modules—SFPs sold separately).
MDS 9509 only
DS-C9506
MDS 9506 director (6-slot modular chassis includes 4 slots for switching modules and 2 slots for supervisor modules—SFPs sold separately).
MDS 9506 only
DS-C9216-K9
MDS 9216 16-port semi-modular fabric switch (includes 16 1-Gbps/2-Gbps Fibre Channel ports, power supply, and expansion slot—SFPs sold separately).
MDS 9216 only
DS-C9216A-K9
MDS 9216A 16-port semi-modular fabric switch (includes 16 1-Gbps/2-Gbps Fibre Channel ports, power supply, and expansion slot—SFPs sold separately).
MDS 9216A only
DS-C9216i-K9
MDS 9216i 16-port semi-modular fabric switch (includes 14 1-Gbps/2-Gbps Fibre Channel ports, 2 Gigabit Ethernet ports, power supply, and expansion slot—SFPs sold separately).
MDS 9216i only
DS-C9140-K9
MDS 9140 fixed configuration (non-modular) fabric switch (includes 8 full rate ports and 32 host-optimized ports).
MDS 9140 only
DS-C9120-K9
MDS 9120 fixed configuration, non-modular, fabric switch (includes 4 full rate ports and 16 host-optimized ports).
MDS 9120 only
External crossbar module
DS-13SLT-FAB1
MDS 9513 crossbar fabric module.
MDS 9513 only
Supervisor modules
DS-X9530-SF2-K9
MDS 9500 Supervisor-2, module.
MDS 9500 Series only
DS-X9530-SF1-K9
MDS 9500 Supervisor/Fabric-I module.
Switching modules
DS-X9016
MDS 9000 16-port 1-Gbps/2-Gbps Fibre Channel module (SFPs sold separately).
MDS 9500 Series and 9200 Series
DS-X9032
MDS 9000 32-port 1-Gbps/2-Gbps Fibre Channel module (SFPs sold separately).
DS-X9112
MDS 9000 12-port 4-Gbps Fibre Channel module (SFPs sold separately).
MDS 9500 Series and 9200 Series, except for the MDS 9216
DS-X9124
MDS 9000 24-port 4-Gbps Fibre Channel module (SFPs sold separately).
MDS 9500 Series and 9200 Series, except for the MDS 9216
DS-X9148
MDS 9000 48-port 4-Gbps Fibre Channel module (SFPs sold separately).
MDS 9500 Series and 9200 Series, except for the MDS 9216
DS-X9704
MDS 9000 4-port 10-Gbps Fibre Channel module (SFPs sold separately)
MDS 9500 Series and 9200 Series, except for the MDS 9216
Services modules
DS-X9308-SMIP
8-port Gigabit Ethernet IP Storage services module.
MDS 9500 Series and 9200 Series
DS-X9304-SMIP
4-port Gigabit Ethernet IP Storage services module.
DS-X9032-SSM
MDS 9000 32-port 1-Gbps/2-Gbps Fibre Channel Storage Services Module (SSM).
DS-X9302-14K9
14-port Fibre Channel/2-port Gigabit Ethernet Multiprotocol Services (MPS-14/2) module.
Optics
DS-X2-FC10G-SR
X2/SC optics, 10-Gbps Fibre Channel for short wavelength mode.
MDS 9500 Series and 9200 Series, except for the MDS 9216
DS-X2-FC10G-LR
X2/SC optics, 10-Gbps Fibre Channel for long wavelength mode.
LC-type fiber-optic SFP
DS-SFP-FC-2G-SW
2-Gbps/1-Gbps Fibre Channel—short wavelength SFP.
MDS 9000 Family
DS-SFP-FC-2G-LW
2-Gbps/1-Gbps Fibre Channel—long wavelength SFP.
DS-SFP-FCGE-SW
1-Gbps Ethernet and 1-Gbps/2-Gbps Fibre Channel—short wavelength SFP.
DS-SFP-FCGE-LW
1-Gbps Ethernet and 1-Gbps/2-Gbps Fibre Channel—long wavelength SFP.
DS-SFP-GE-T
1-Gbps Ethernet SFP.
DS-SFP-FC4G-SW
4-Gbps/2-Gbps/1-Gbps Fibre Channel—short wavelength SFP for DS-X91xx switching modules.
MDS 9500 Series and 9200 Series, except for the MDS 9216
DS-SFP-FC4G-MR
4-Gbps/2-Gbps/1-Gbps Fibre Channel—long wavelength SFP for DS-X91xx switching modules only. Supports distances up to 4 km.
DS-SFP-FC4G-LW
4-Gbps/2-Gbps/1-Gbps Fibre Channel—long wavelength SFP for DS-X91xx switching modules only. Supports distances up to 10 km.
CWDM2
DS-CWDM-xxxx
Gigabit Ethernet and 1-Gbps/2-Gbps Fibre Channel SFP LC interface xxxx nm, where xxxx = 1470, 1490, 1510, 1530, 1550, 1570, 1590, or 1610 nm.
MDS 9000 Family
DS-CWDM-MUX-4
Add/drop multiplexer for four CWDM wavelengths.
DS-CWDM-MUX-8
Add/drop multiplexer for eight CWDM wavelengths.
DS-CWDMCHASSIS
Two slot chassis for CWDM add/drop multiplexers.
Power supplies
DS-CAC-6000W
6000-W AC power supply.
MDS 9513 only
DS-CAC-2500W
2500-W AC power supply.
MDS 9509 only
DS-CDC-2500W
2500-W DC power supply.
DS-CAC-3000W
3000-W AC power supply.
DS-CAC-4000W-US
4000-W AC power supply for US (cable attached).
DS-CAC-4000W-INT
4000-W AC power supply international (cable attached).
DS-CAC-1900W
1900-W AC power supply.
MDS 9506 only
DS-CDC-1900W
1900-W DC power supply.
DS-CAC-845W
845-W AC power supply.
MDS 9200 Series only
DS-CAC-300W
300-W3 AC power supply.
MDS 9100 Series only
CompactFlash
MEM-MDS-FLD512M
MDS 9500 supervisor CompactFlash disk, 512 MB.
MDS 9500 Series only
Port analyzer adapter
DS-PAA-2, DS-PAA
A standalone Fibre Channel-to-Ethernet adapter that allows for simple, transparent analysis of Fibre Channel traffic in a switched fabric.
MDS 9000 Family
CD-ROM
M90FM-CD-212=
MDS 9000 Management Software and Documentation CD-ROM, spare.
MDS 9000 Family
1 SFP = small form-factor pluggable
2 CWDM = coarse wavelength division multiplexing
3 W = Watt
Software Download Process
Use the software download procedure to upgrade to a later version, or downgrade to an earlier version, of an operating system. This section describes the software download process for the Cisco MDS SAN-OS and includes the following topics:
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Determining the Software Version
To determine the version of Cisco MDS SAN-OS software currently running on a Cisco MDS 9000 Family switch using the CLI, log in to the switch and enter the show version EXEC command.
To determine the version of Cisco MDS SAN-OS software currently running on a Cisco MDS 9000 Family switch using the Fabric Manager, view the Switches tab in the Information pane, locate the switch using the IP address, logical name, or WWN, and check its version in the Release column.
Note
Downloading Software
The Cisco MDS SAN-OS software is designed for mission-critical high availability environments. To realize the benefits of nondisruptive upgrades on the Cisco MDS 9500 Directors, we highly recommend that you install dual supervisor modules.
To download the latest Cisco MDS SAN-OS software, access the Software Center at this URL:
http://www.cisco.com/public/sw-center
See the following sections in this release note for details on how you can nondisruptively upgrade your Cisco MDS 9000 switch. Issuing the install all command from the CLI, or using Fabric Manager to perform the downgrade, enables the compatibility check. The check indicates if the upgrade can happen nondisruptively or disruptively depending on the current configuration of your switch and the reason.
Compatibility check is done:Module bootable Impact Install-type Reason------ -------- -------------- ------------ ------1 yes non-disruptive rolling2 yes disruptive rolling Hitless upgrade is not supported3 yes disruptive rolling Hitless upgrade is not supported4 yes non-disruptive rolling5 yes non-disruptive reset6 yes non-disruptive resetAt a minimum, you need to disable the default device alias distribution feature using the no device-alias distribute command in global configuration mode. The show incompatibility system bootflash:1.3(x)_filename command determines which additional features need to be disabled.
Note
Selecting the Correct Software Image for an MDS 9500 Series Switch
The system and kickstart image that you use for an MDS 9500 Series switch depends on whether the switch is based on a Supervisor-1 module or a Supervisor-2 module, as shown in Table 3.
Use the show module command to display the type of supervisor module in the switch.
For a Supervisor-1 module, the output might look like this:
switch# show moduleMod Ports Module-Type Model Status--- ----- -------------------------------- ------------------ ------------......5 0 Supervisor/Fabric-1 DS-X9530-SF1-K9 active*6 0 Supervisor/Fabric-1 DS-X9530-SF1-K9 ha-standbyFor a Supervisor-2 module, the output might look like this:
switch# show moduleMod Ports Module-Type Model Status--- ----- -------------------------------- ------------------ ------------......7 0 Supervisor/Fabric-2 DS-X9530-SF2-K9 active *8 0 Supervisor/Fabric-2 DS-X9530-SF2-K9 ha-standbyMigrating from Supervisor-1 Modules to Supervisor-2 Modules
As of Cisco MDS SAN-OS Release 3.0(1), the Cisco MDS 9509 and 9506 Directors support both Supervisor-1 and Supervisor-2 modules. Supervisor-1 and Supervisor-2 modules cannot be installed in the same switch, except during migration. Both the active and standby supervisor modules must be of the same type, either Supervisor-1 or Supervisor-2 modules. For Cisco MDS 9513 Directors, both supervisor modules must be Supervisor-2 modules.
Caution
Note
To migrate from a Supervisor-1 module to a Supervisor-2 module, refer to the step-by-step instructions in the Cisco MDS 9000 Family CLI Configuration Guide.
Configuring Generation 2 Switching Modules
The Cisco MDS 9500 Multilayer Directors are designed to operate with any combination of Cisco MDS 9000 Generation 1 and Generation 2 modules. However, there are limitations to consider when combining the various modules and supervisors in the Cisco MDS 9500 Series platform chassis. The references listed in this section provide specific information about configurations that combine different modules and supervisors.
For information on configuring Generation 2 switching modules, refer to:
http://www.cisco.com/en/US/products/ps5989/products_configuration_guide_chapter09186a0080664c6b.html
For information on port index availability, refer to:
http://www.cisco.com/en/US/products/ps5990/products_installation_guide_chapter09186a0080419599.html
For information on Cisco MDS 9000 hardware and software compatibility, refer to:
http://www.cisco.com/en/US/products/ps5989/products_device_support_table09186a00805037ee.html
Upgrading Your Cisco MDS SAN-OS Software Image
This section lists the guidelines recommended for upgrading your Cisco MDS SAN-OS software image and contains the following sections:
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Note
General Upgrading Guidelines
Use the following guidelines when upgrading to Cisco MDS SAN-OS Release 3.0(3b):
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Use Table 4 to determine your nondisruptive upgrade path to Cisco SAN-OS Release 3.0(3b). Find the image release number you are currently using in the Current column of the table and use the path recommended.
Note
Use Table 5 to determine your nondisruptive upgrade path to Cisco SAN-OS Release 3.0(3b). Find the image release number you are currently using in the Current Release with FICON Enabled column of the table and use the path recommended.
Performing a Nondisruptive Software Upgrade on Generation 1 Modules
Generation 1 modules may reload during a nondisruptive SAN-OS software upgrade because of the CompactFlash being unable to partition for the new code. If that happens, the installer aborts and reloads the module.
This issue affects the following modules:
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This issue might be seen during an upgrade from Cisco SAN-OS Release 3.0(x), 3.1(x) or 3.2(x). It has been addressed for upgrades from SAN-OS Release 3.3(1) or higher. Therefore, you will not be impacted by this issue if you are running SAN-OS Release 3.3(1) when you upgrade to a higher SAN-OS release.
When this problem occurs, the module will automatically reload and may cause the Install All to stop, which will cause the upgrade to be unsuccessful. Error messages similar to the following may be displayed:
Install has failed. Return code 0x40930020 (Non-disruptive upgrade of a module failed).Please identify the cause of the failure, and try 'install all' again.Module 2: Non-disruptive upgrading.-- FAIL. Return code 0x40690009 (Error in downloading image for image upgrade).To avoid this kind of unplanned disruption, follow the methods for identifying and correcting this issue described in Cisco Field Notice 63099, before proceeding with the SAN-OS upgrade. This Field notice can be found under the Support, Products page for Cisco MDS9500 Series Multilayer Directors selection.
The caveat associated with this issue is CSCsm62295.
Upgrading with IVR Enabled
An Inter-Switch Link (ISL) flap resulting in fabric segmentation or a merge during or after an upgrade from Cisco MDS SAN-OS Release 2.0(x) to a later image where IVR is enabled might be disruptive. Some possible scenarios include the following:
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If this problem occurs, syslogs indicate a failure and the flapped ISL could remain in a down state because of a domain overlap.
This issue was resolved in Cisco SAN-OS Release 2.1(2b); therefore, you must upgrade to Release 2.1(2b) before upgrading to Release 3.0(x). A FICON fabric can upgrade from the Cisco SAN-OS Releases 2.0(2b) and 2.0(3) to Release 3.0(x). However, an upgrade from Cisco SAN-OS Releases 2.1(1a), 2.1(1b), or 2.1(2a) to Release 2.1(2b) when IVR is enabled requires that you follow the procedure below, and then follow the upgrade guidelines listed in the "General Upgrading Guidelines" section. If you have VSANs in interop mode 2 or 3, you must issue an IVR refresh for those VSANs.
To upgrade from Cisco SAN-OS Releases 2.1(1a), 2.1(1b), or 2.1(2a) to Release 2.1(2b) for all other VSANs with IVR enabled, follow these steps:
Step 1
Note
Step 2
Note
Step 3
2005 Aug 31 21:52:04 switch %FCDOMAIN-2-EPORT_ISOLATED:%$VSAN 2005%$ Isolation of interfaceport-channel 52 (reason: unknown failure)2005 Aug 31 21:52:04 switch %FCDOMAIN-2-EPORT_ISOLATED: %$VSAN 2005%$Isolation of interface port-channel 51(reason: domain ID assignment failure)Step 4
switch(config)# vsan databaseswitch(config-vsan-db)# vsan vsan-id suspendswitch(config-vsan-db)# no vsan vsan-id suspendStep 5
Step 6
Step 7
Note
Reconfiguring SSM Ports Before Upgrading to SAN-OS Release 3.0(3b)
Starting with Cisco MDS SAN-OS Release 3.0(1), the SSM front panel ports can no longer be configured in auto mode, which is the default for releases prior to Release 3.0(1).
Note
For more information on upgrading SAN-OS software, see the "Upgrading Your Cisco MDS SAN-OS Software Image" section.
If the configuration is not updated before the upgrade, the installation process for the new image will automatically convert all ports configured in auto mode to Fx mode. This change in mode might cause a disruption if the port is currently operating in E mode.
To upgrade the image on your SSM without any traffic disruption, follow these steps:
Step 1
switch# show interface fc 2/1 - 32fc2/1 is upHardware is Fibre Channel, SFP is short wave laser w/o OFC (SN)Port WWN is 20:4b:00:0d:ec:09:3c:00Admin port mode is auto <-------- shows port is configured in auto modesnmp traps are enabledPort mode is F, FCID is 0xef0300 <-------- shows current port operational mode is FPort vsan is 1Speed is 2 GbpsTransmit B2B Credit is 3Step 2
a.
switch# config tswitch(config)# interface fc 2/1switch(config-if)# switchport mode fxb.
switch# config tswitch(config)# interface fc 2/5switch(config-if)# switchport mode eStep 3
a.
switch# config tswitch(config)# interface fc 2/2switch(config-if)# switchport mode fxb.
switch# config tswitch(config)# interface fc 2/2switch(config-if)# shutdownswitch# copy running-config startup-config
Upgrading the SSI Image on Your SSM
Use the following guidelines to nondisruptively upgrade the SSI image on your SSM:
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Caution
Downgrading Your Cisco MDS SAN-OS Software Image
This section lists the guidelines recommended for downgrading your Cisco MDS SAN-OS software image and contains the following sections:
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General Downgrading Guidelines
Use the following guidelines to nondisruptively downgrade your Cisco MDS SAN-OS Release 3.0(3b):
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Use Table 6 to determine your nondisruptive downgrade path from Cisco SAN-OS Release 3.0(3b). Find the SAN-OS image you want to downgrade to in the To SAN-OS Release column of the table and use the path recommended.
Note
Use Table 7 to determine your nondisruptive downgrade path from Cisco SAN-OS Release 3.0(3b). Find the image release number you are currently using in the Current Release with FICON Enabled column of the table and use the path recommended.
Downgrading your SSI Image on Your SSM
Use the following guidelines when downgrading your SSI image on your SSM.
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Note
switch(config)# poweroff module slot
switch# purge module slot running-config
New Features in Cisco MDS SAN-OS Release 3.0(3b)
This section briefly describes the new features introduced in this release. For detailed information about the features listed, refer to the Cisco MDS 9000 Family CLI Configuration Guide and the Cisco MDS 9000 Family Fabric Manager Configuration Guide.
Note
There are no new features in Cisco MDS SAN-OS Release 3.0(3b)
Limitations and Restrictions
This section lists the limitations and restrictions for this release.
CWDM SFPs
Some 2-Gbps CWDM SFPs do not have have speed capability encoded in EEPROM memory and they could negotiate and obtain synchronization up to 4-Gbps on modules that support 4-Gbps speed. As a result, the link comes up and appears to work, but then becomes disabled and connectivity problems occur. To correct this problem, both sides of the connection must have their speed fixed to 1- or 2-Gbps instead of Auto.
Fabric Manager
Observe the following limitations or restrictions for the Cisco SAN-OS Release 3.0(3b) for Fabric Manager:
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iSNS
Observe the following behaviors regarding the iSNS server and client:
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MTU Size Limitation
The Cisco MDS 9216i switch and MPS-14/2 module do not support an MTU size greater than 8000 bytes. An attempt to set the MTU size greater than 8000 bytes will result in an error. As a workaround, reset the value of the MTU size (576 to 8000 bytes) and issue the no shutdown command on the interface for normal operation.
Reconfiguring SSM Ports
Starting with Cisco MDS SAN-OS Release 3.0(1), the SSM front panel ports can no longer be configured in auto mode, which is the default for releases prior to Release 3.0(1). For instructions about how to modify the configuration of the ports before upgrading to SAN-OS Release 3.0(3b), see the "Reconfiguring SSM Ports Before Upgrading to SAN-OS Release 3.0(3b)" section.
Virtual Router Redundancy Protocol (VRRP) Interfaces
When a switchover occurs on a switch that is the master for Virtual Router Redundancy Protocol (VRRP) interfaces, the switchover may cause a minor delay. As a result, the VRRP backup (occurring elsewhere) may assume the role of the VRRP master. As a workaround, increase the VRRP advertisement interval for these interfaces.
Caveats
This section lists the open and resolved caveats for this release. Use Table 8 to determine the status of a particular caveat. In the table, "O" indicates an open caveat and "R" indicates a resolved caveat.
Guest
