Cisco Systems DSC9148D8G48PK9 guide

Chapter 4 Configuring Interface Buffers

Information About Interface Buffers

BB_Credit Buffers for Fabric Switches

This section describes how buffer credits are allocated to Cisco MDS 9000 Fabric switches, and includes the following topics:

•Cisco MDS 9148 Fabric Switch BB_Credit Buffers, page 4-16

•Cisco MDS 9148 Fabric Switch BB_Credit Buffers, page 4-16

•Cisco MDS 9124 Fabric Switch BB_Credit Buffers, page 4-17

•Cisco MDS 9222i Multiservice Modular Switch BB_Credit Buffers, page 4-17

Cisco MDS 9148 Fabric Switch BB_Credit Buffers

Table 4-10lists the BB_credit buffer allocation for 48-port 8-Gbps Fibre Channel switches.

Table 4-10	48-Port 8-Gbps Fabric Switch BB_Credit Buffer Allocation

		BB_Credit
		Buffers Per
BB_Credit Buffer Allocation Type		Port Group	BB_Credit Buffers Per Port

			ISL1	Fx Port
Default BB_credit buffers		128	32	32

Maximum configurable BB_credit buffers on 8-Gbps		128	125	125
mode

1. ISL = E port or TE port.

The following considerations apply to BB_credit buffers on 48-port 8-Gbps Fabric Switches:

•BB_credit buffers can be configured from a minimum of 1 buffer to a maximum of 32 buffers per port when the ports are in F or FL mode.

•BB_credit buffers can be configured from a minimum of 2 buffers to a maximum of 32 buffers per port when the ports are in E or TE mode.

Cisco MDS 9134 Fabric Switch BB_Credit Buffers

Table 4-11lists the BB_credit buffer allocation for MDS 9134 Fabric Switches.

Table 4-11 MDS 9134 Fabric Switch BB_Credit Buffer Allocation

	BB_Credit
	Buffers Per
BB_Credit Buffer Allocation Type	Port Group	BB_Credit Buffers Per Port

		ISL1	Fx Port
Maximum user-configurable BB_credit buffers	64	61	61

Minimum user-configurable BB_credit buffers		2	1

Default BB_credit buffers on 10-Gbps mode	64	64	64

Default BB_credit buffers on 4-Gbps mode	64	16	16

1. ISL = E port or TE port.

	Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
4-16	OL-29284-01, Release 6.x

Image 144

Cisco Systems DSC9148D8G48PK9 manual BBCredit Buffers for Fabric Switches, Cisco MDS 9148 Fabric Switch BBCredit Buffers

Contents

Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide Americas HeadquartersPage N T E N T S TL Ports Specifying a Port Owner Configuring Fibre Channel Interfaces Information About Interface Buffers Default Settings Deleting an Interface from a PortChannel Verifying NPV Monitoring Ports in a Vsan Xii Port Monitor Configuring Port Added information about 22a Enhancements Monitor Policy Feature Port Monitor Port GuardThree new counters for the port Monitor command About This Guide FlexAttach Monitoring Monitoring a selected port groupEnhancements Audience OrganizationChapter Title Description Document Conventions Boldface font Related Documentation Command-Line Interface Troubleshooting and Reference Trunks and PortChannels Fibre Channel Port Rate Limiting Extended Credits Port VirtualizationFlexAttach Interfaces Overview FlexAttach OL-29284-01, Release Configuring Interfaces Information About Interfaces Interface Description Interface Modes Port FL PortNP Ports TL Port TE PortTF Port Auto Mode TNP PortSD Port ST Port Administrative States Interface StatesOperational States Reason Codes Administrative Operational Configuration Status Reason Code NoneReason Codes for Interface States Applicable Reason Code long version Description ModesReason Codes for Nonoperational States Graceful Shutdown Port Administrative Speeds Frame EncapsulationAutosensing Bit Error Thresholds Cisco MDS 9000 Family Switch Interface ModesBeacon LEDs Speed LEDs SFP Transmitter Types Extended transmitters assigned to Cisco-supported SFPsSFP Transmitter Acronym Definitions TL Ports CWDM-1590 CWDM-1610 C1590 C1610Translation from Translation to Example Supported TL Port Translations TL Port Alpa Caches Port Guard Port Monitor Threshold Interval Rising Falling Counter Type Seconds Event Local Switching Port Monitor Port GuardPort Group Monitor Rising Threshold Slow Drain Device Detection and Congestion Avoidance Management Interfaces Generation 1 Interface Configuration Guidelines Prerequisites for InterfacesGuidelines and Limitations Vsan Interfaces Private Loop Configuration Guidelines Vsan Interface Configuration Guidelines Default Settings Configuring Interfaces7lists the default settings for interface parameters Parameters Default Configuring Fibre Channel Interfaces Command Purpose Setting the Interface Administrative State Configuring Interface Modes Configuring System Default Port Mode F Sets the administrative mode of Fibre Channel ports toMode F if applicable Default unless user configured Configuring ISL between Two Switches Configuring 10-Gbps FC Mode Configuring Port Administrative Speeds Configuring Port Speed Group Configuring the Interface Description Configuring Beacon Mode Enters configuration modeInterface configuration submode Specifying a Port Owner Disabling Bit Error Threshold Configuring Switch Port Attribute Default Values Configuring TL Ports Configures manual entries into the Alpa cacheManually Inserting Entries into the Alpa Cache Clearing the Alpa Cache Configuring Port Guard Configuring Port Monitor To enable port monitor, follow these stepsEnables default port monitoring Disables port monitoring Configuring a Port Monitor Policy Specifies the delta protocol error poll interval Specifies the delta signal loss poll intervalReverts to the default policy for sync loss Reverts to the default policy for Tx performance Configuring a Port Monitor Port Guard Configuring Port Group MonitorActivating a Port Monitor Policy Configuring a Port Group Monitor Policy Enabling Port Group Monitor Reverting to the Default Policy for a Specific Counter Turning Off the Monitoring of Specific Counter Configuring Management Interfaces Activating a Port Group Monitor Policy Creating Vsan Interfaces Configuring Congestion Frame Timeout Value Configuring Stuck Frame Timeout ValueConfiguring No-Credit Timeout Value Configuring Credit Loss Recovery Threshold and Action Specifies the no-credit timeout value and portMode for the switch Specifies the default no-credit timeout value port Verifying Interfaces Configuration Configuring Interfaces Verifying Interfaces Configuration Discards, 0 errors Displaying Interface InformationExample 2-3 Displays All Interfaces Example 2-4 Displays Multiple, Specified Interfaces Interface fc1/1 5 , fc2/5Interface fc3/13 , fc3/16 Switch# show interface fc2/2 fc2/2 is trunking Example 2-5 Displays a Specific InterfaceFrames/sec Switch# show interface description Switch# show interface briefExample 2-6 Displays Port Description Switch# show interface counters fc3/1 Example 2-8 Displays Interface Counters Switch# show interface counters brief Example 2-9 Displays Interface Counters in Brief Format Switch# show running-config Example 2-10 Displays Transceiver Information Switch# show running-config interface fc1/1 System default switchport mode F interface fc4/1 Switch# show tlport list Displaying TL Port InformationExample 2-17 Displays the TL Ports in All VSANs Displaying the Alpa Cache Contents Displaying Port Monitor Status and Policies Switch# show port-monitor Port-monitor active Switch# show port-group-monitor status Displaying Port Group Monitor Status and Policies Switch# show port-group-monitor DefaultPgm1 Pgm2 Displaying Management Interface Configuration Switch# show interface mgmt 0 mgmt0 is upDisplaying Vsan Interface Information OL-29284-01, Release Generations of Modules and Switches Information About Fibre Channel Interfaces Generation 3 Fabric Switch Part Number Product Name and DescriptionBackplane crossbar bandwidth Any-to-any connectivity Generation 2 Fabric Switches Port GroupsMaximum Product Name Generation 3 Fabric Switches DS-C9148-K9 Port 8-Gbps Cisco MDS Fabric switchPart Number Description Per Port Group Gbps Generation 3 Modules Port Rate Modes Supports Default Speed Product Name Mode and RateSwitches Dedicated Rate Mode Part Number Description Mode Mode on All PortsConfigured Speed Reserved Bandwidth Auto Gbps Auto with 4-Gbps maximum Shared Rate Mode Auto Gbps Auto with 2-Gbps maximum Dedicated Rate Mode Configurations for the 8-Gbps Modules Modules Port Speed Dynamic Bandwidth ManagementNegotiates to a maximum speed of 4 Gbps Negotiates to a maximum speed of 8 Gbps Out-of-Service Interfaces Oversubscription Ratio Restrictions Switch# show port-resources module 8 Module Bandwidth Allocation for Oversubscribed Interfaces Switch# show port-resources module Fc5/12 Shared Port-Group Total bandwidth is 32.4 Gbps Fc5/31 Buffers Gbps Upgrade or Downgrade Scenario Switch# show module 2 bandwidth-fairnessBandwidth Fairness Guidelines and Limitations Local Switching Limitations Switch# show port index-allocationPort Index Limitations Switch# show module Number of Port Indexes RequiredGeneration 1 Module Supervisor-1 Module Supervisor-2 Module Port Index Requirements for Generation 1 Modules PortChannel Limitations PortChannels have the following restrictionsShow port index-allocation startup Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide PortChannel Configuration and Addition Results PortChannelNew Member Members PortChannel Type Addition Type Result If resources are not available Default Port 4-Gbps Port 10-Gbps Parameter Switching Module Speed mode Auto Auto1 Rate mode SharedAuto Shared Dedicated Configuring Fibre Channel Interfaces Port mode BBcredit buffers14 Default Generation 4 Interface Parameters Configure the rate mode dedicated or shared Configure the port modeConfigure the rate mode dedicated or shared to use Task Flow for Configuring 12-Port 4-Gbps Module Interfaces Task Flow for Configuring 4-Port 10-Gbps Module Interfaces Configuring Port Speed Configuring Rate Mode Switch# show interface fc 9/1 fc9/1 is up Displaying the Rate Mode Configuration for Interfaces Port-resources command to Switch# show port-resource module 4 Module Fc4/1232 8.0 shared Port-Group Total bandwidth is 12.8 Gbps Switch# show port-resources module 7 Module Fc7/13 Configuring Local Switching Disabling Restrictions on Oversubscription Ratios Buffers Gbps Fc2/1 Shared Fc2/2 Fc2/3 Switch# show running-config include oversubscription-limit Switch# copy running-config startup-configEnabling Restrictions on Oversubscription Ratios Shut down Enabling Bandwidth Fairness Taking Interfaces Out of Service Configuration submodeDisabling Bandwidth Fairness Selects the interface and enters interface Disables the interface Takes the interface out of serviceFc9/2 out-of-service Releasing Shared Resources in a Port Group Verifying Fibre Channel Interfaces Configuration Disabling ACL Adjacency Sharing for System Image Downgrade Switch# show interface fc 9/1 capabilities Switch# show interface fc 4/1 capabilitiesDisplaying Interface Capabilities Configuration Examples for Fibre Channel Interfaces Displaying SFP Diagnostic Information Configuration Example for 48-Port 8-Gbps Module Interfaces Configuration Example for 24-Port 8-Gbps Module InterfacesEnable the interfaces and return to configuration mode Select the interfaces fc 4/3 through fc 4/4 Disable the interfaces and take them out of service Return to configuration modeSelect interfaces fc 3/1 Select the interfaces fc 3/2 through fc 3/3 Configuration Example for 48-Port 4-Gbps Module Interfaces Switchconfig# interface fc 4/2Select the interfaces fc 4/2 through fc 4/10 Select the interfaces fc 4/1 through fc 4/6 Configuration Example for 24-Port 4-Gbps Module Interfaces Select the interfaces fc 4/7 through fc 4/10Select the interfaces fc 3/4 through fc 3/6 OL-29284-01, Release Information About Interface Buffers Buffer-to-Buffer Credits Performance Buffers Buffer Pools Total BB credit buffers 189047 BBCredit Buffers for Switching Modules Shared Rate Mode BBCredit Buffers Per PortGbps Speed BBCredit Buffer Allocation Fx Port Default BBcredit buffers 250 Maximum BBcredit buffers 500 Port 8-Gbps Switching Module BBCredit Buffer Allocation Default BBcredit buffers 500 Maximum BBcredit buffers 24-Port 8-Gbps Switching Module BBCredit Buffer AllocationTotal Number of BBCredit Buffers per Module Ports 1 through Ports 13 through 6000 Three ports with dedicated rate mode and 4-Gbps speed 4/44-Port 8-Gbps Switching Module BBCredit Buffer Allocation Dedicated Rate Mode 48-Port 4-Gbps Switching Module BBCredit Buffer AllocationGbps Speed Gbps 24-Port 4-Gbps Switching Module BBCredit Buffer Allocation Port 4-Gbps Fibre Channel Module BBCredit Buffers Port 4-Gbps Switching Module BBCredit Buffers 12-Port 4-Gbps Switching Module BBCredit Buffer AllocationGbps Speed BBCredit Buffer Allocation Type ISL Fx Port ISL Port 10-Gbps Switching Module BBCredit Buffers 4-Port 10-Gbps Switching Module BBCredit Buffer AllocationGbps Speed BBCredit Buffer Allocation Type Port BBCredit Buffers for Fabric Switches Cisco MDS 9148 Fabric Switch BBCredit BuffersCisco MDS 9134 Fabric Switch BBCredit Buffers Port 8-Gbps Fabric Switch BBCredit Buffer Allocation Cisco MDS 9124 Fabric Switch BBCredit Buffers User-configurable BBcredit buffers 4509 250MDS 9124 Fabric Switch BBCredit Buffer Allocation Defaults Extended BBCredits Extended BBcredits on Generation 1 Switching Modules Port Group Support for the Extended BBCredits Feature OL-29284-01, Release Buffer-to-Buffer Credit Recovery Buffer-to-Buffer State Change Number Configuring Interface Buffers Configuring Buffer-to-Buffer CreditsReceive Data Field Size Configuring Performance Buffers Configuring Extended BBcredits Enabling Buffer-to-Buffer Credit Recovery Configuring Receive Data Field SizeEnabling the Buffer-to-Buffer State Change Number Verifying BBCredit Configuration Interface to 2000 bytes. The default isReduces the data field size for the selected Bytes and the range is from 256 to 2112 bytes Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide Information About Trunking Trunking E Ports Trunking F Ports Link Number Link Description1a and 1b Port trunk with N port Port trunk with NP port Trunking NP port with third-party core switch F port Key ConceptsTrunking Protocols PortChannnel with NP port Trunk Link Default Your Trunk Mode ConfigurationPort Type Switch Trunking State Port Mode Port Type Core Switch NPV Switch Trunking State Link Mode Trunk-Allowed Vsan Lists and VFIDs Vsan and VF-ID Reservations Are Operational and Allowed Vsan Configuration General Guidelines and Limitations Upgrade and Downgrade Limitations Switchconfig-if#switchport trunk allowed vsanSwitch# show interface fc2/15 Difference Between TE Ports and TF-TNP Ports Sw7# show interface fc1/13 W7# show interface fc1/13 Trunking Misconfiguration Examples Vsan Mismatch Configuring Trunking Enabling the Cisco Trunking and Channeling Protocols Configuring Trunk Mode Configuring an Allowed-Active List of VSANsEnabling the F Port Trunking and Channeling Protocol Verifying Trunking Configuration Configuration Example for F Port Trunking Enable Npiv on the MDS core switchConfigure the trunk mode to on on the MDS core switch Configure the port mode to NP on the NPV switch Save the configuration Switchconfig# copy running-config startup-config OL-29284-01, Release Configuring PortChannels Information About PortChannels PortChannels Overview PortChannelsPortChannel Flexibility TF PortChannels PortChanneling and TrunkingTrunking Only Load Balancing PortChanneling and Trunking SID1 and DID1-Based Load Balancing PortChannel Modes SID1, DID1, and Exchange-Based Load Balancing On Mode Active Mode Channel Group Configuration DifferencesPortChannel Deletion Interfaces in a PortChannel Interface Addition to a PortChannel Compatibility Check PortChannel Protocols Forcing an Interface AdditionInterface Deletion from a PortChannel Channel Group Creation Autocreating Channel Groups User-Configured Channel Group Autocreated Channel Group Autocreation Manually Configured Channel Groups Prerequisites for PortChannels Configuring PortChannels Guidelines and Limitations Generation 1 PortChannel Limitations TF PortChannel Limitations 7provides examples of valid PortChannel configurations Valid and Invalid PortChannel Examples 3lists the default settings for PortChannels Misconfigured ConfigurationsDefault PortChannel Parameters Configuring PortChannels Configuring the PortChannel ModeConfigures the specified PortChannel 1 using Default on mode Deleting PortChannels Adding an Interface to a PortChannel Forcing an Interface Addition Deleting an Interface from a PortChannel Verifying PortChannel Configuration Enabling and Configuring AutocreationConverting to Manually Configured Channel Groups Switch# show port-channel summary Switch# show port-channel database port-channelExample 6-1 Displays the PortChannel Summary Port-channel database Switch# show port-channel consistency Switch# show port-channel consistency detailExample 6-4 Displays the Consistency Status without Details Example 6-5 Displays the Consistency Status with Details Example 6-6 Displays the PortChannel Usage Example 6-7 Displays the PortChannel CompatibilityExample 6-8 Displays Autocreated PortChannels Example 6-9 Displays the Specified PortChannel Interface Configuration Examples for F and TF PortChannels Create the PortChannel on the MDS core switchCreate the PortChannel on the NPV switch Example 6-10 Displays the PortChannel Summary Create the PortChannel in dedicated mode on the NPV switch Switchconfig# interface port-channel Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide Configuring N Port Virtualization NPV Overview Port Identifier Virtualization Port VirtualizationNpiv Example Cisco NPV Fabric Configuration NPV Mode NP Ports NP LinksInternal Flogi Parameters Default Port Numbers Parameter Derived FromInternal Flogi Parameters NPV CFS Distribution over IP NPV Traffic ManagementAuto Traffic Map Multiple Vsan Support DisruptiveNPV Guidelines and Requirements Dpvm Configuration Guidelines NPV Traffic Management Guidelines Configuring N Port Virtualization Configuring NPVNPV and Port Security Configuration Guidelines Enabling N Port Identifier Virtualization To configure NPV using the CLI, perform the following tasks On the NPV core switch, enters configurationEnables Npiv mode on the NPV core switch Disables Npiv mode on the NPV core switch Configuring NPV Traffic Management Verifying NPV Configuration Enabling the Global Policy for Disruptive Load Balancing Switch# show fcns database Switch# show fcns database detailVerifying NPV Switch# show npv flogi-table Switch# show npv internal info traffic-mapVerifying NPV Traffic Management OL-29284-01, Release Information About FlexAttach Virtual pWWN FlexAttach Virtual pWWN FlexAttach Virtual pWWN CFS Distribution SAN Device Virtualization SDV FlexAttach VirtualizationDifference Between SDV and FlexAttach Virtualization Configuring FlexAttach Virtual pWWN Security Settings for FlexAttach Virtual pWWNAutomatically Assigning FlexAttach Virtual pWWN Manually Assigning FlexAttach Virtual pWWN Mapping pWWN to Virtual pWWN Verifying FlexAttach Virtual pWWN Configuration Commits the configurationSpecified virtual pWWN and the real pWWN must not be logged To map pWWN to virtual pWWN, perform this task Error Description Workaround Monitoring FlexAttach Virtual pWWNVerifying the End Device Error Description Workaround OL-29284-01, Release Configuring Port Tracking Information About Port Tracking 1lists the default settings for port tracking parameters Default Port Tracking Parameters Configuring Port Tracking Information About Configuring Linked PortsEnabling Port Tracking Binding a Tracked Port Operationally Information About Tracking Multiple Ports Tracking Multiple Ports Information About Monitoring Ports in a VsanMonitoring Ports in a Vsan Displaying Port Tracking Information Information AboutForceful ShutdownForcefully Shutting Down a Tracked Port Linked port Switch# show interface fc1/1 Switch# show interface port-channelPort linked to interface fc1/1 Example 9-4 Displays a Forced Shutdown Configuration Switch# show interface fc 1/5 Bandwidth fairness Default settings Example configurations Port 10-Gbps switching modulesAsterisk First operational port IN-2 Deleting from PortChannels IN-3 Configuring descriptions MPS-14/2 modules Configuring extended BBcredits IN-5 IN-6 TL ports Alpa caches Configuring Trunk mode Administrative default ConfiguringStatus Trunk ports Displaying information IN-8