Configuring Interface Buffers | Cisco Systems DSC9148D8G48PK9

Chapter 4 Configuring Interface Buffers

Configuring Interface Buffers

Note If you use distance extension (buffer-to-buffer credit spoofing) on ISLs between switches, the BB_SCN parameter on both sides of the ISL needs to be disabled.

Receive Data Field Size

You can also configure the receive data field size for Fibre Channel interfaces. If the default data field size is 2112 bytes, the frame length will be 2148 bytes.

Configuring Interface Buffers

This section includes the following topics:

•Configuring Buffer-to-Buffer Credits, page 4-21

•Configuring Performance Buffers, page 4-22

•Configuring Extended BB_credits, page 4-23

•Enabling Buffer-to-Buffer Credit Recovery, page 4-24

•Enabling the Buffer-to-Buffer State Change Number, page 4-24

•Configuring Receive Data Field Size, page 4-24

Configuring Buffer-to-Buffer Credits

Detailed Steps

To configure BB_credits for a Fibre Channel interface, follow these steps:

	Command	Purpose
Step 1
Step 1	switch# config t	Enters configuration mode.
	switch(config)#
Step 2
Step 2	switch(config)# interface fc1/1	Selects a Fibre Channel interface and enters
	switch(config-if)#	interface configuration submode.

		Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
		Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
	OL-29284-01, Release 6.x			4-21
	OL-29284-01, Release 6.x			4-21

Image 149

Cisco Systems DSC9148D8G48PK9 Configuring Interface Buffers, Receive Data Field Size, Configuring Buffer-to-Buffer Credits

Contents

Americas Headquarters Cisco MDS 9000 Family NX-OS Interfaces Configuration GuidePage 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 Enhancements Monitor Policy Feature Port Monitor Port Guard Port Monitor Configuring Port Added information about 22aThree new counters for the port Monitor command About This Guide Enhancements FlexAttachMonitoring Monitoring a selected port group Chapter Title Description AudienceOrganization Boldface font Document Conventions Related Documentation Troubleshooting and Reference Command-Line Interface Fibre Channel Port Rate Limiting Trunks and PortChannels FlexAttach Extended CreditsPort Virtualization Interfaces Overview FlexAttach OL-29284-01, Release Information About Interfaces Configuring Interfaces Interface Modes Interface Description NP Ports PortFL Port TF Port TL PortTE Port TNP Port Auto ModeSD Port ST Port Interface States Administrative StatesOperational States Reason Codes Reason Codes for Interface States Administrative Operational Configuration Status Reason CodeNone Reason Codes for Nonoperational States ApplicableReason Code long version Description Modes Graceful Shutdown Autosensing Port Administrative SpeedsFrame Encapsulation Cisco MDS 9000 Family Switch Interface Modes Bit Error ThresholdsBeacon LEDs Speed LEDs SFP Transmitter Acronym Definitions SFP Transmitter TypesExtended transmitters assigned to Cisco-supported SFPs CWDM-1590 CWDM-1610 C1590 C1610 TL PortsTranslation from Translation to Example Supported TL Port Translations Port Guard TL Port Alpa Caches Threshold Interval Rising Falling Counter Type Seconds Event Port Monitor Port Monitor Port Guard Local SwitchingPort Group Monitor Rising Threshold Management Interfaces Slow Drain Device Detection and Congestion Avoidance Prerequisites for Interfaces Generation 1 Interface Configuration GuidelinesGuidelines and Limitations Vsan Interfaces Vsan Interface Configuration Guidelines Private Loop Configuration Guidelines Configuring Interfaces Default Settings7lists the default settings for interface parameters Parameters Default Command Purpose Configuring Fibre Channel Interfaces Configuring Interface Modes Setting the Interface Administrative State Sets the administrative mode of Fibre Channel ports to Configuring System Default Port Mode FMode F if applicable Default unless user configured Configuring 10-Gbps FC Mode Configuring ISL between Two Switches Configuring Port Administrative Speeds Configuring the Interface Description Configuring Port Speed Group Enters configuration mode Configuring Beacon ModeInterface configuration submode Specifying a Port Owner Configuring Switch Port Attribute Default Values Disabling Bit Error Threshold Configures manual entries into the Alpa cache Configuring TL PortsManually Inserting Entries into the Alpa Cache Clearing the Alpa Cache Configuring Port Guard To enable port monitor, follow these steps Configuring Port MonitorEnables default port monitoring Disables port monitoring Configuring a Port Monitor Policy Specifies the delta signal loss poll interval Specifies the delta protocol error poll intervalReverts to the default policy for sync loss Reverts to the default policy for Tx performance Activating a Port Monitor Policy Configuring a Port Monitor Port GuardConfiguring Port Group Monitor Enabling Port Group Monitor Configuring a Port Group Monitor Policy Turning Off the Monitoring of Specific Counter Reverting to the Default Policy for a Specific Counter Activating a Port Group Monitor Policy Configuring Management Interfaces Creating Vsan Interfaces Configuring No-Credit Timeout Value Configuring Congestion Frame Timeout ValueConfiguring Stuck Frame Timeout Value Specifies the no-credit timeout value and port Configuring Credit Loss Recovery Threshold and ActionMode for the switch Specifies the default no-credit timeout value port Configuring Interfaces Verifying Interfaces Configuration Verifying Interfaces Configuration Example 2-3 Displays All Interfaces Discards, 0 errorsDisplaying Interface Information Interface fc3/13 , fc3/16 Example 2-4 Displays Multiple, Specified InterfacesInterface fc1/1 5 , fc2/5 Frames/sec Switch# show interface fc2/2 fc2/2 is trunkingExample 2-5 Displays a Specific Interface Example 2-6 Displays Port Description Switch# show interface descriptionSwitch# show interface brief Example 2-8 Displays Interface Counters Switch# show interface counters fc3/1 Example 2-9 Displays Interface Counters in Brief Format Switch# show interface counters brief Example 2-10 Displays Transceiver Information Switch# show running-config System default switchport mode F interface fc4/1 Switch# show running-config interface fc1/1 Example 2-17 Displays the TL Ports in All VSANs Switch# show tlport listDisplaying TL Port Information Displaying Port Monitor Status and Policies Displaying the Alpa Cache Contents Port-monitor active Switch# show port-monitor Displaying Port Group Monitor Status and Policies Switch# show port-group-monitor status Default Switch# show port-group-monitorPgm1 Pgm2 Displaying Vsan Interface Information Displaying Management Interface ConfigurationSwitch# show interface mgmt 0 mgmt0 is up OL-29284-01, Release Information About Fibre Channel Interfaces Generations of Modules and Switches Part Number Product Name and Description Generation 3 Fabric SwitchBackplane crossbar bandwidth Any-to-any connectivity Port Groups Generation 2 Fabric SwitchesMaximum Product Name DS-C9148-K9 Port 8-Gbps Cisco MDS Fabric switch Generation 3 Fabric SwitchesPart Number Description Per Port Group Gbps Generation 3 Modules Port Rate Modes Switches Supports Default Speed Product NameMode and Rate Part Number Description Mode Mode on All Ports Dedicated Rate ModeConfigured Speed Reserved Bandwidth Auto Gbps Auto with 4-Gbps maximum Auto Gbps Auto with 2-Gbps maximum Shared Rate Mode Modules Dedicated Rate Mode Configurations for the 8-Gbps Modules Dynamic Bandwidth Management Port SpeedNegotiates to a maximum speed of 4 Gbps Negotiates to a maximum speed of 8 Gbps Oversubscription Ratio Restrictions Out-of-Service Interfaces Bandwidth Allocation for Oversubscribed Interfaces Switch# show port-resources module 8 Module Switch# show port-resources module Fc5/12 Shared Port-Group Total bandwidth is 32.4 Gbps Fc5/31 Buffers Gbps Bandwidth Fairness Upgrade or Downgrade ScenarioSwitch# show module 2 bandwidth-fairness Guidelines and Limitations Port Index Limitations Local Switching LimitationsSwitch# show port index-allocation Number of Port Indexes Required Switch# show moduleGeneration 1 Module Supervisor-1 Module Supervisor-2 Module Port Index Requirements for Generation 1 Modules Show port index-allocation startup PortChannel LimitationsPortChannels have the following restrictions Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide New Member Members PortChannel Type Addition Type Result PortChannel Configuration and Addition ResultsPortChannel If resources are not available Speed mode Auto Auto1 Rate mode Shared Default Port 4-Gbps Port 10-Gbps Parameter Switching ModuleAuto Shared Dedicated 14 Default Generation 4 Interface Parameters Configuring Fibre Channel InterfacesPort mode BBcredit buffers Configure the rate mode dedicated or shared to use Configure the rate mode dedicated or sharedConfigure the port mode Task Flow for Configuring 4-Port 10-Gbps Module Interfaces Task Flow for Configuring 12-Port 4-Gbps Module Interfaces Configuring Port Speed Switch# show interface fc 9/1 fc9/1 is up Configuring Rate Mode Port-resources command to Displaying the Rate Mode Configuration for Interfaces 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# copy running-config startup-config Switch# show running-config include oversubscription-limitEnabling Restrictions on Oversubscription Ratios Shut down Enabling Bandwidth Fairness Configuration submode Taking Interfaces Out of ServiceDisabling Bandwidth Fairness Selects the interface and enters interface Takes the interface out of service Disables the interfaceFc9/2 out-of-service Releasing Shared Resources in a Port Group Disabling ACL Adjacency Sharing for System Image Downgrade Verifying Fibre Channel Interfaces Configuration Displaying Interface Capabilities Switch# show interface fc 9/1 capabilitiesSwitch# show interface fc 4/1 capabilities Displaying SFP Diagnostic Information Configuration Examples for Fibre Channel Interfaces Configuration Example for 24-Port 8-Gbps Module Interfaces Configuration Example for 48-Port 8-Gbps Module InterfacesEnable the interfaces and return to configuration mode Select the interfaces fc 4/3 through fc 4/4 Return to configuration mode Disable the interfaces and take them out of serviceSelect interfaces fc 3/1 Select the interfaces fc 3/2 through fc 3/3 Switchconfig# interface fc 4/2 Configuration Example for 48-Port 4-Gbps Module InterfacesSelect the interfaces fc 4/2 through fc 4/10 Select the interfaces fc 4/1 through fc 4/6 Select the interfaces fc 3/4 through fc 3/6 Configuration Example for 24-Port 4-Gbps Module InterfacesSelect the interfaces fc 4/7 through fc 4/10 OL-29284-01, Release Buffer-to-Buffer Credits Information About Interface Buffers Buffer Pools Performance Buffers Total BB credit buffers 189047 BBCredit Buffers for Switching Modules BBCredit Buffers Per Port Shared Rate ModeGbps Speed BBCredit Buffer Allocation Fx Port Port 8-Gbps Switching Module BBCredit Buffer Allocation Default BBcredit buffers 250 Maximum BBcredit buffers 500 24-Port 8-Gbps Switching Module BBCredit Buffer Allocation Default BBcredit buffers 500 Maximum BBcredit buffersTotal Number of BBCredit Buffers per Module Ports 1 through Ports 13 through 6000 4/44-Port 8-Gbps Switching Module BBCredit Buffer Allocation Three ports with dedicated rate mode and 4-Gbps speed Gbps Speed Dedicated Rate Mode48-Port 4-Gbps Switching Module BBCredit Buffer Allocation Gbps Port 4-Gbps Fibre Channel Module BBCredit Buffers 24-Port 4-Gbps Switching Module BBCredit Buffer Allocation Gbps Speed BBCredit Buffer Allocation Type ISL Fx Port Port 4-Gbps Switching Module BBCredit Buffers12-Port 4-Gbps Switching Module BBCredit Buffer Allocation ISL 4-Port 10-Gbps Switching Module BBCredit Buffer Allocation Port 10-Gbps Switching Module BBCredit BuffersGbps Speed BBCredit Buffer Allocation Type Port Cisco MDS 9148 Fabric Switch BBCredit Buffers BBCredit Buffers for Fabric SwitchesCisco MDS 9134 Fabric Switch BBCredit Buffers Port 8-Gbps Fabric Switch BBCredit Buffer Allocation User-configurable BBcredit buffers 4509 250 Cisco MDS 9124 Fabric Switch BBCredit BuffersMDS 9124 Fabric Switch BBCredit Buffer Allocation Defaults Extended BBCredits Port Group Support for the Extended BBCredits Feature Extended BBcredits on Generation 1 Switching Modules OL-29284-01, Release Buffer-to-Buffer State Change Number Buffer-to-Buffer Credit Recovery Receive Data Field Size Configuring Interface BuffersConfiguring Buffer-to-Buffer Credits Configuring Performance Buffers Configuring Extended BBcredits Enabling the Buffer-to-Buffer State Change Number Enabling Buffer-to-Buffer Credit RecoveryConfiguring Receive Data Field Size Interface to 2000 bytes. The default is Verifying BBCredit ConfigurationReduces 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 Trunking E Ports Information About Trunking 1a and 1b Port trunk with N port Port trunk with NP port Trunking F PortsLink Number Link Description Key Concepts Trunking NP port with third-party core switch F portTrunking Protocols PortChannnel with NP port Your Trunk Mode Configuration Trunk Link DefaultPort Type Switch Trunking State Port Mode Port Type Core Switch NPV Switch Trunking State Link Mode Vsan and VF-ID Reservations Trunk-Allowed Vsan Lists and VFIDs Are General Guidelines and Limitations Operational and Allowed Vsan Configuration Switchconfig-if#switchport trunk allowed vsan Upgrade and Downgrade LimitationsSwitch# show interface fc2/15 Difference Between TE Ports and TF-TNP Ports W7# show interface fc1/13 Sw7# show interface fc1/13 Vsan Mismatch Trunking Misconfiguration Examples Enabling the Cisco Trunking and Channeling Protocols Configuring Trunking Enabling the F Port Trunking and Channeling Protocol Configuring Trunk ModeConfiguring an Allowed-Active List of VSANs Verifying Trunking Configuration Enable Npiv on the MDS core switch Configuration Example for F Port TrunkingConfigure the trunk mode to on on the MDS core switch Configure the port mode to NP on the NPV switch Switchconfig# copy running-config startup-config Save the configuration OL-29284-01, Release Information About PortChannels Configuring PortChannels PortChannel Flexibility PortChannels OverviewPortChannels Trunking Only TF PortChannelsPortChanneling and Trunking PortChanneling and Trunking Load Balancing SID1 and DID1-Based Load Balancing SID1, DID1, and Exchange-Based Load Balancing PortChannel Modes Channel Group Configuration Differences On Mode Active ModePortChannel Deletion Interfaces in a PortChannel Compatibility Check Interface Addition to a PortChannel Interface Deletion from a PortChannel PortChannel ProtocolsForcing an Interface Addition Autocreating Channel Groups Channel Group Creation Autocreation User-Configured Channel Group Autocreated Channel Group Prerequisites for PortChannels Manually Configured Channel Groups Configuring PortChannels Guidelines and Limitations TF PortChannel Limitations Generation 1 PortChannel Limitations Valid and Invalid PortChannel Examples 7provides examples of valid PortChannel configurations Default PortChannel Parameters 3lists the default settings for PortChannelsMisconfigured Configurations Configuring the PortChannel Mode Configuring PortChannelsConfigures the specified PortChannel 1 using Default on mode Adding an Interface to a PortChannel Deleting PortChannels Deleting an Interface from a PortChannel Forcing an Interface Addition Converting to Manually Configured Channel Groups Verifying PortChannel ConfigurationEnabling and Configuring Autocreation Switch# show port-channel database port-channel Switch# show port-channel summaryExample 6-1 Displays the PortChannel Summary Port-channel database Switch# show port-channel consistency detail Switch# show port-channel consistencyExample 6-4 Displays the Consistency Status without Details Example 6-5 Displays the Consistency Status with Details Example 6-7 Displays the PortChannel Compatibility Example 6-6 Displays the PortChannel UsageExample 6-8 Displays Autocreated PortChannels Example 6-9 Displays the Specified PortChannel Interface Create the PortChannel on the MDS core switch Configuration Examples for F and TF PortChannelsCreate the PortChannel on the NPV switch Example 6-10 Displays the PortChannel Summary Switchconfig# interface port-channel Create the PortChannel in dedicated mode on the NPV switch Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide NPV Overview Configuring N Port Virtualization Npiv Example Port Identifier VirtualizationPort Virtualization Cisco NPV Fabric Configuration NPV Mode Internal Flogi Parameters NP PortsNP Links Internal Flogi Parameters Default Port NumbersParameter Derived From NPV Traffic Management NPV CFS Distribution over IPAuto Traffic Map NPV Guidelines and Requirements Multiple Vsan SupportDisruptive NPV Traffic Management Guidelines Dpvm Configuration Guidelines Configuring NPV Configuring N Port VirtualizationNPV and Port Security Configuration Guidelines Enabling N Port Identifier Virtualization On the NPV core switch, enters configuration To configure NPV using the CLI, perform the following tasksEnables Npiv mode on the NPV core switch Disables Npiv mode on the NPV core switch Configuring NPV Traffic Management Enabling the Global Policy for Disruptive Load Balancing Verifying NPV Configuration Verifying NPV Switch# show fcns databaseSwitch# show fcns database detail Verifying NPV Traffic Management Switch# show npv flogi-tableSwitch# show npv internal info traffic-map OL-29284-01, Release FlexAttach Virtual pWWN Information About FlexAttach Virtual pWWN Difference Between SDV and FlexAttach Virtualization FlexAttach Virtual pWWN CFS DistributionSAN Device Virtualization SDV FlexAttach Virtualization Automatically Assigning FlexAttach Virtual pWWN Configuring FlexAttach Virtual pWWNSecurity Settings for FlexAttach Virtual pWWN Mapping pWWN to Virtual pWWN Manually Assigning FlexAttach Virtual pWWN Commits the configuration Verifying FlexAttach Virtual pWWN ConfigurationSpecified virtual pWWN and the real pWWN must not be logged To map pWWN to virtual pWWN, perform this task Verifying the End Device Error Description WorkaroundMonitoring FlexAttach Virtual pWWN Error Description Workaround OL-29284-01, Release Information About Port Tracking Configuring Port Tracking Default Port Tracking Parameters 1lists the default settings for port tracking parameters Enabling Port Tracking Configuring Port TrackingInformation About Configuring Linked Ports Information About Tracking Multiple Ports Binding a Tracked Port Operationally Monitoring Ports in a Vsan Tracking Multiple PortsInformation About Monitoring Ports in a Vsan Information AboutForceful Shutdown Displaying Port Tracking InformationForcefully Shutting Down a Tracked Port Linked port Port linked to interface fc1/1 Switch# show interface fc1/1Switch# show interface port-channel Switch# show interface fc 1/5 Example 9-4 Displays a Forced Shutdown Configuration Asterisk First operational port Bandwidth fairness Default settings Example configurationsPort 10-Gbps switching modules IN-2 IN-3 Deleting from PortChannels MPS-14/2 modules Configuring extended BBcredits Configuring descriptions IN-5 IN-6 Status Trunk ports Displaying information TL ports Alpa caches ConfiguringTrunk mode Administrative default Configuring IN-8