- play_arrow Weighted Random Early Detection (WRED) and Explicit Congestion Notification (ECN)
- play_arrow WRED and Drop Profiles
- play_arrow Explicit Congestion Notification (ECN)
-
- play_arrow CoS Queue Schedulers, Traffic Control Profiles, and Hierarchical Port Scheduling (ETS)
- play_arrow Queue Schedulers and Scheduling Priority
- Understanding Default CoS Scheduling and Classification
- Understanding CoS Scheduling Behavior and Configuration Considerations
- Understanding CoS Output Queue Schedulers
- Defining CoS Queue Schedulers
- Example: Configuring Queue Schedulers
- Defining CoS Queue Scheduling Priority
- Example: Configuring Queue Scheduling Priority
- Monitoring CoS Scheduler Maps
- play_arrow Port Scheduling and Shaping
- play_arrow Troubleshooting Egress Bandwidth Issues
- play_arrow Traffic Control Profiles and Priority Group Scheduling
- Understanding CoS Traffic Control Profiles
- Understanding CoS Priority Group Scheduling
- Understanding CoS Virtual Output Queues (VOQs)
- Defining CoS Traffic Control Profiles (Priority Group Scheduling)
- Example: Configuring Traffic Control Profiles (Priority Group Scheduling)
- Understanding CoS Priority Group and Queue Guaranteed Minimum Bandwidth
- Example: Configuring Minimum Guaranteed Output Bandwidth
- Understanding CoS Priority Group Shaping and Queue Shaping (Maximum Bandwidth)
- Example: Configuring Maximum Output Bandwidth
- play_arrow Hierarchical Port Scheduling (ETS)
-
- play_arrow Data Center Bridging and Lossless FCoE
- play_arrow Data Center Bridging
- Understanding DCB Features and Requirements
- Understanding DCBX
- Configuring the DCBX Mode
- Configuring DCBX Autonegotiation
- Understanding DCBX Application Protocol TLV Exchange
- Defining an Application for DCBX Application Protocol TLV Exchange
- Configuring an Application Map for DCBX Application Protocol TLV Exchange
- Applying an Application Map to an Interface for DCBX Application Protocol TLV Exchange
- Example: Configuring DCBX Application Protocol TLV Exchange
- play_arrow Lossless FCoE
- Example: Configuring CoS PFC for FCoE Traffic
- Example: Configuring CoS for FCoE Transit Switch Traffic Across an MC-LAG
- Example: Configuring CoS Using ELS for FCoE Transit Switch Traffic Across an MC-LAG
- Example: Configuring Lossless FCoE Traffic When the Converged Ethernet Network Does Not Use IEEE 802.1p Priority 3 for FCoE Traffic (FCoE Transit Switch)
- Example: Configuring Two or More Lossless FCoE Priorities on the Same FCoE Transit Switch Interface
- Example: Configuring Two or More Lossless FCoE IEEE 802.1p Priorities on Different FCoE Transit Switch Interfaces
- Example: Configuring Lossless IEEE 802.1p Priorities on Ethernet Interfaces for Multiple Applications (FCoE and iSCSI)
- Troubleshooting Dropped FCoE Traffic
-
- play_arrow CoS Buffers and the Shared Buffer Pool
- play_arrow CoS Buffers Overview
- play_arrow Shared Buffer Pool Examples
- Example: Recommended Configuration of the Shared Buffer Pool for Networks with Mostly Best-Effort Unicast Traffic
- Example: Recommended Configuration of the Shared Buffer Pool for Networks with Mostly Best-Effort Traffic on Links with Ethernet PAUSE Enabled
- Example: Recommended Configuration of the Shared Buffer Pool for Networks with Mostly Multicast Traffic
- Example: Recommended Configuration of the Shared Buffer Pool for Networks with Mostly Lossless Traffic
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- play_arrow CoS on EVPN VXLANs
- play_arrow Configuration Statements and Operational Commands
Understanding Host Routing Engine Outbound Traffic Queues and Defaults
The host Routing Engine and CPU generate outbound traffic that is transmitted using different protocols. You cannot configure a classifier to map different types of outbound traffic that the host generates to forwarding classes (queues). The traffic that the host generates is assigned to forwarding classes by default as shown in Table 1.
If you want to separate host outbound traffic from other traffic or if you want to assign that traffic to a particular queue, you can configure a single forwarding class for all traffic that the host generates. If you configure a forwarding class for outbound host traffic, that forwarding class is used globally for all traffic generated by the host. (That is, the host outbound traffic is mapped to the selected queue on all egress interfaces.) Configuring a forwarding class for host outbound traffic does not affect transit or incoming traffic.
Whether you use the default host outbound traffic forwarding class configuration or configure a forwarding class for all host outbound traffic, the configuration applies to all Layer 2 and Layer 3 protocols and to all application-level traffic such as FTP and ping operations.
If you configure a queue for host outbound traffic, the queue must be properly configured on all interfaces.
Fibre Channel over Ethernet (FCoE) Initialization Protocol
(FIP) packets generated by the CPU are always transmitted on the fcoe queue (queue 3), even if you configure a queue for host
outbound traffic. This helps to ensure lossless behavior for FCoE
traffic. QFabric systems classify FIP control packets into the same
traffic class (fcoe) across the Interconnect device (fabric)
and the egress Node device.
This does not apply to OCX Series switches, which do not support FCoE.
By default, traffic generated by the host is sent to the best effort queue (queue 0) or to the network control queue (queue 7). Table 1 lists the default host traffic to output queue mapping.
Routing Engine Protocol | Default Queue Mapping |
|---|---|
Address Resolution Protocol (ARP) reply | Queue 0 |
ARP request | Queue 0 |
Bidirectional Forwarding Detection (BFD) Protocol | Queue 7 |
Border Gateway Protocol (BGP) | Queue 0 |
BGP TCP Retransmission | Queue 7 |
Fibre Channel over Ethernet (FCoE) Initialization Protocol (FIP) | Queue 3 |
File Transfer Protocol (FTP) | Queue 0 |
Internet Control Message Protocol (ICMP) reply | Queue 0 |
ICMP request | Queue 0 |
Internet Group Management Protocol (IGMP) query | Queue 7 |
IGMP report | Queue 0 |
Link Aggregation Control Protocol (LACP) | Queue 7 |
Open Shortest Path First (OSPF) hello | Queue 7 |
OSPF protocol data unit (PDU) | Queue 7 |
OSPF link state advertisements (LSAs) | Queue 7 |
Protocol Independent Multicast (PIM) | Queue 7 |
PIM hello | Queue 7 |
Simple Network Management Protocol (SNMP) | Queue 0 |
Secure Shell (SSH) | Queue 0 |
Telnet | Queue 0 |
Virtual Router Redundancy Protocol (VRRP) | Queue 7 |
VLAN Spanning Tree Protocol (VSTP) | Queue 7 |
| Queue 0 |
| Queue 0 |
