8.3.17.0 - Force10 Networks

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www.dell.com | support.dell.com 60 | Data Center Bridging (DCB) • When an ETS output policy is applied to an interface, ETS-configured scheduling and bandwidth allocation take precedence over any auto-configured settings in the QoS output policies. • ETS is enabled by default with the default ETS configuration applied (all dot1p priorities in the same group with equal bandwidth allocation). ETS Operation with DCBX In DCBX negotiation with peer ETS devices, ETS configuration is handled as follows: • ETS TLVs are supported in DCBX versions CIN, CEE, and IEEE2.5. • ETS operational parameters are determined by the DCBX port-role configurations. • ETS configurations received from TLVs from a peer are validated. • In case of a hardware limitation or TLV error: • DCBX operation on an ETS port goes down. • New ETS configurations are ignored and existing ETS configurations are reset to the previously configured ETS output policy on the port or to the default ETS settings if no ETS output policy was previously applied. • ETS operates with legacy DCBX versions as follows: • In the CEE version, the priority group/traffic class group (TCG) ID 15 represents a non-ETS priority group. Any priority group configured with a scheduler type is treated as a strict-priority group and is given the priority-group (TCG) ID 15. • The CIN version supports two types of strict-priority scheduling: — Group strict priority: Allows a single priority flow in a priority group to increase its bandwidth usage to the bandwidth total of the priority group. A single flow in a group can use all the bandwidth allocated to the group. — Link strict priority: Allows a flow in any priority group to increase to the maximum link bandwidth. CIN supports only the default dot1p priority-queue assignment in a priority group. Bandwidth Allocation for DCBX CIN After an ETS output policy is applied to an interface, if the DCBX version used in your data center network is CIN, a QoS output policy is automatically configured to overwrite the default CIN bandwidth allocation. This default setting divides the bandwidth allocated to each port queue equally between the dot1p priority traffic assigned to the queue.
DCB Policies in a Switch Stack A DCB input policy with PFC and ETS configuration is applied to all stacked ports in a switch stack or on a stacked switch. DCBX Operation The data center bridging exchange protocol (DCBX) is used by DCB devices to exchange configuration information with directly connected peers using the link layer discovery protocol (LLDP) protocol. DCBX can detect the misconfiguration of a peer DCB device, and optionally, configure peer DCB devices with DCB feature settings to ensure consistent operation in a data center network. DCBX is a prerequisite for using DCB features, such as priority-based flow control (PFC) and enhanced traffic selection (ETS), to exchange link-level configurations in a converged Ethernet environment. DCBX is also deployed in topologies that support lossless operation for FCoE or iSCSI traffic. In these scenarios, all network devices are DCBX-enabled (DCBX is enabled end-to-end). The following versions of DCBX are supported on an Aggregator: CIN, CEE, and IEEE2.5. DCBX requires the LLDP to be enabled on all DCB devices. DCBX Operation DCBX performs the following operations: • Discovers DCB configuration (such as PFC and ETS) in a peer device. • Detects DCB misconfiguration in a peer device; that is, when DCB features are not compatibly configured on a peer device and the local switch. Misconfiguration detection is feature-specific because some DCB features support asymmetric configuration. • Reconfigures a peer device with the DCB configuration from its configuration source if the peer device is willing to accept configuration. • Accepts the DCB configuration from a peer if a DCBX port is in “willing” mode to accept a peer’s DCB settings and then internally propagates the received DCB configuration to its peer ports. Data Center Bridging (DCB) | 61
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Dell PowerEdge Configuration Guide
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October 2012 | iii
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1 About this Guide . . . . . . . .
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Data Center Bridging Exchange Proto
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Displaying VLAN Membership . . . .
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Read Managed Object Values . . . .
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Troubleshooting Packet Loss . . . .
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About this Guide Objectives 1 This
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Before You Start Default Settings 2
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DCB Support DCB enhancements for da
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The untagged VLAN of a server-facin
Page 23 and 24: Configuration Fundamentals 3 The De
Page 25 and 26: Navigating CLI Modes The FTOS promp
Page 27 and 28: Figure 3-5. Undoing a command with
Page 29 and 30: Table 3-2. Short-Cut Keys and their
Page 31 and 32: Multiple Users in Configuration Mod
Page 33 and 34: Getting Started This chapter contai
Page 35 and 36: Uplink Ports Ports 33 to 56 are ext
Page 37 and 38: Step Task (continued) Note: Termina
Page 39 and 40: Figure 4-4. Completed Boot Process
Page 41 and 42: Figure 4-6. Completed Boot Process
Page 43 and 44: Access the Aggregator Remotely Conf
Page 45 and 46: Dell Force10 recommends using the e
Page 47 and 48: Figure 4-10 shows an example of usi
Page 49 and 50: To view the contents of a file, fol
Page 51 and 52: Figure 4-14. Alternative Storage Lo
Page 53 and 54: Aggregator Management This chapter
Page 55 and 56: Changing System Logging Settings Yo
Page 57 and 58: Configuring a UNIX Logging Facility
Page 59 and 60: Enabling the FTP Server To enable t
Page 61 and 62: Recovering from a Forgotten Passwor
Page 63 and 64: Figure 5-5. Recovering from a Faile
Page 65 and 66: Data Center Bridging (DCB) 6 On an
Page 67 and 68: Figure 6-1. Priority-Based Flow Con
Page 69 and 70: Data Center Bridging Exchange Proto
Page 71 and 72: QoS dot1p Traffic Classification an
Page 73: How Enhanced Transmission Selection
Page 77 and 78: Note: On a DCBX port, application p
Page 79 and 80: Auto-Detection of the DCBX Version
Page 81 and 82: DCBX Error Messages An error in DCB
Page 83 and 84: Figure 6-7. show interfaces pfc sum
Page 85 and 86: Table 6-3. show interface pfc summa
Page 87 and 88: Table 6-4. show interface ets detai
Page 89 and 90: Figure 6-12. show interface dcbx de
Page 91 and 92: Example: PFC and ETS Operation This
Page 93 and 94: Table 6-8. Example: priority group-
Page 95 and 96: Skippy812 Dynamic Host Configuratio
Page 97 and 98: Assigning an IP Address Using DHCP
Page 99 and 100: Releasing and Renewing DHCP-based I
Page 101 and 102: Figure 7-5. DHCP Client: Debug Mess
Page 103 and 104: DHCP Client on a Management Interfa
Page 105 and 106: FIP Snooping 8 FIP snooping is auto
Page 107 and 108: Figure 8-1. FIP discovery and login
Page 109 and 110: The following sections describe how
Page 111 and 112: FIP Snooping Prerequisites On an Ag
Page 113 and 114: Figure 8-3. show fip-snooping sessi
Page 115 and 116: Figure 8-7. show fip-snooping stati
Page 117 and 118: Table 8-5. show fip-snooping statis
Page 119 and 120: FIP Snooping Example Figure 8-11 sh
Page 121 and 122: Internet Group Management Protocol
Page 123 and 124: IGMP Version 3 Conceptually, IGMP v
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Leaving and Staying in Groups Figur
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Figure 9-6. show ip igmp groups Com
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Interfaces 10 This chapter describe
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Viewing Interface Information You c
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Disabling and Re-enabling a Physica
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The Aggregator supports the managem
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Configuring a Static Route for a Ma
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Port-Based VLANs Port-based VLANs a
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Displaying VLAN Membership To view
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Adding an Interface to an Untagged
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Port channels can contain a mix of
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Figure 10-12. show interface port-c
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Create a Multiple-Range Figure 10-1
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Maintenance Using TDR The time doma
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MTU Size The Aggregator auto-config
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Figure 10-19. show interfaces statu
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Figure 10-21 shows the auto-negotia
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Clearing Interface Counters The cou
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iSCSI Optimization 11 An Aggregator
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If no iSCSI traffic is detected for
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Displaying iSCSI Optimization Infor
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Link Aggregation The Aggregator aut
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LACP Example Figure 12-1 shows an e
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Figure 12-3. show lacp 128 Command
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Figure 12-5. show interfaces port-c
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Layer 2 The Aggregator supports CLI
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Figure 13-1. Redundant NICs with NI
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Link Layer Discovery Protocol (LLDP
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Organizationally Specific TLVs Orga
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TIA Organizationally Specific TLVs
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LLDP-MED Network Policies TLV A net
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LLDP Operation On an Aggregator, LL
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Figure 14-10. Viewing All Informati
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Debugging LLDP The debug lldp comma
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Table 14-8. LLDP System MIB Objects
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Table 14-10. LLDP-MED System MIB Ob
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Port Monitoring 15 The Aggregator s
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Figure 15-2 shows ports 0/25 and 0/
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In Figure 15-4, the host and server
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16 Simple Network Management Protoc
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Dell Force10 supports RFC 4001, Tex
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Figure 16-6 shows the output for an
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Use dot3aCurAggFdbTable to fetch th
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Monitor Port-channels To check the
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The status of the MIBS is as follow
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Stacking Overview 17 An Aggregator
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Stack Master Election The stack ele
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Stacking Port Numbers By default, e
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Cabling Procedure The following cab
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Resetting a Unit on a Stack Use the
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Figure 17-19. show system Command E
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Troubleshooting a Switch Stack Trou
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Figure 17-27. show hardware stack-u
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Stack Unit in Card-Problem State Du
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Upgrading a Single Stack Unit Upgra
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Broadcast Storm Control 18 On the A
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System Time and Date 19 The Aggrega
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Setting the Time Zone Universal tim
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Setting Recurring Daylight Saving T
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Uplink Failure Detection (UFD) Upli
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Figure 20-2. Uplink Failure Detecti
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Show Command Syntax Description sho
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Debugging UFD on an Interface To en
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Upgrade Procedures 21 To view the r
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Debugging and Diagnostics The chapt
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Broadcast, unknown multicast, and D
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Auto-configured VLANs do not exist
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Figure 22-2. show system stack-unit
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Figure 22-3. Taking a Stack Unit Of
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Table 22-2. show hardware Commands
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Recognize an Over-Temperature Condi
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The simple network management proto
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Deciding to Tune Buffers Dell Force
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Figure 22-11. Displaying Buffer Pro
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Sample Buffer Profile Configuration
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Figure 22-14. Displaying Buffer Sta
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Displaying Stack Port Statistics Th
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Figure 22-19. Mini application core
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Standards Compliance This chapter c
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General IPv4 Protocols RFC# Full Na
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Network Management (continued) RFC#
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