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Example: Configuring Lossless IEEE 802.1p Priorities on Ethernet Interfaces for Multiple Applications (FCoE and iSCSI)
Although the default configuration provides two lossless forwarding classes mapped to two different IEEE 802.1p priorities (code points), you can explicitly configure up to six lossless forwarding classes and map them to different priorities. You can support up to six different types of lossless traffic, and you can support the same type of traffic on different priorities in different parts of your converged network.
This example shows you how to configure two lossless forwarding classes for FCoE traffic and one lossless forwarding class for iSCSI traffic, and map the forwarding classes to three different priorities. (The converged Ethernet network includes two FCoE networks, each of which uses a different priority to identify FCoE traffic, and an iSCSI network.)
Requirements
This example uses the following hardware and software components:
One switch used as an FCoE transit switch
Junos OS Release 12.3 or later for the QFX Series
Overview
Some converged Ethernet networks support FCoE on more than one IEEE 802.1p priority and also require supporting other lossless traffic classes. Interfaces that carry multiple lossless forwarding classes need to support lossless behavior for the priorities mapped to those forwarding classes. To support the two FCoE forwarding classes and the iSCSI forwarding class used in this example, you need to configure:
At least one lossless forwarding class for FCoE traffic (this example uses the default
fcoeforwarding class as one of the two lossless FCoE forwarding classes, so we need to explicitly configure only one FCoE forwarding class)A lossless forwarding class for iSCSI traffic
Behavior aggregate (BA) classifiers to map the lossless forwarding classes to the appropriate IEEE 802.1p code points (priorities) on each interface
Congestion notification profiles (CNPs) for each interface to enable PFC on the FCoE and iSCSI code points at the interface ingress, and to configure PFC flow control on the interface egress so that the interface can respond to PFC messages received from the connected peer
Note:Configuring or changing PFC on an interface blocks the entire port until the PFC change is completed. After a PFC change is completed, the port is unblocked and traffic resumes. Blocking the port stops ingress and egress traffic, and causes packet loss on all queues on the port until the port is unblocked.
DCBX applications and an application map to support DCBX application TLV exchange for the FCoE and iSCSI traffic on the configured lossless priorities. By default, DCBX is enabled on all Ethernet interfaces for FCoE, but only on priority 3 (IEEE 802.1p code point 011). To support DCBX application TLV exchange when you are not using the default configuration, you must configure all of the applications and map them to interfaces and priorities.
The priorities specified in the BA classifiers, CNPs, and DCBX application map must match, or the configuration does not work. You must specify the same lossless FCoE forwarding class in each configuration and use the same IEEE 802.1p code point (priority) so that the FCoE traffic is properly classified into flows and so that those flows receive lossless treatment.
Topology
This example shows how to configure two lossless FCoE traffic classes and one lossless iSCSI traffic class, map them to three different priorities, and configure flow control to ensure lossless behavior for those priorities on the interfaces. This example uses four Ethernet interfaces, xe-0/0/31, xe-0/0/32, xe-0/0/33, and xe-0/0/34:
Interface xe-0/0/31 handles FCoE traffic on priority 3 (IEEE 802.1p code point 011) and iSCSI traffic on priority 4 (code point 100).
Interface xe-0/0/32 handles FCoE traffic on priority 5 (code point 101) and iSCSI traffic on priority 4.
Interface xe-0/0/33 handles FCoE traffic on priority 3 and priority 5.
Interface xe-0/0/34 handles iSCSI traffic on priority 4.
Figure 1 shows the topology for this example, and Table 1 shows the configuration components for this example.
Component |
Settings |
|---|---|
Hardware |
One switch |
Forwarding classes |
This example uses one explicitly configured lossless FCoE forwarding class, the default lossless FCoE forwarding class, and one explicitly configured iSCSI forwarding class.
|
BA classifiers |
Each interface requires a different classifier because each interface handles a different subset of FCoE traffic.
|
PFC configuration (CNPs) |
Each interface requires a different CNP because each interface handles a different subset of FCoE and iSCSI traffic, and must pause that traffic on different priorities.
Note:
When you apply a CNP with an explicit output queue flow control configuration to an interface, the explicit CNP overwrites the default output CNP. The output queues that are enabled for PFC pause in the default configuration (queues 3 and 4) are not enabled for pause unless they are included in the explicitly configured output CNP. |
DCBX application mapping |
This example requires configuring applications for FCoE and iSCSI, including them in the same application map, and applying the application map to all four interfaces. Application map name—
Note:
LLDP and DCBX must be enabled on the interface. By default, LLDP and DCBX are enabled on all Ethernet interfaces. |
This example does not include scheduling (bandwidth allocation) configuration or the FIP snooping configuration. This examples focuses only on the lossless FCoE priority configuration.
QFX10000 switches do not support FIP snooping. For this reason, QFX10000 switches cannot be used as FCoE access transit switches. QFX10000 switches can be used as intermediate or aggregation transit switches in the FCoE path, between an FCoE access transit switch that performs FIP snooping and an FCF.
Configuration
CLI Quick Configuration
To quickly configure two lossless FCoE forwarding
classes and one lossless iSCSI forwarding class and map them to different
priorities, copy the following commands, paste them in a text file,
remove line breaks, change variables and details to match your network
configuration, and then copy and paste the commands into the CLI at
the [edit] hierarchy level.
set class-of-service forwarding-classes class iscsi queue-num 4 no-loss set class-of-service forwarding-classes class fcoe1 queue-num 5 no-loss set class-of-service classifiers ieee-802.1 fcoe_p3_iscsi forwarding-class fcoe loss-priority low code-points 011 set class-of-service classifiers ieee-802.1 fcoe_p3_iscsi forwarding-class iscsi loss-priority low code-points 100 set class-of-service classifiers ieee-802.1 fcoe_p3_iscsi forwarding-class best-effort loss-priority high code-points 000 set class-of-service classifiers ieee-802.1 fcoe_p3_iscsi forwarding-class best-effort loss-priority high code-points 001 set class-of-service classifiers ieee-802.1 fcoe_p3_iscsi forwarding-class best-effort loss-priority high code-points 010 set class-of-service classifiers ieee-802.1 fcoe_p3_iscsi forwarding-class best-effort loss-priority high code-points 101 set class-of-service classifiers ieee-802.1 fcoe_p3_iscsi forwarding-class best-effort loss-priority high code-points 110 set class-of-service classifiers ieee-802.1 fcoe_p3_iscsi forwarding-class best-effort loss-priority high code-points 111 set class-of-service classifiers ieee-802.1 fcoe_p5_iscsi forwarding-class iscsi loss-priority low code-points 100 set class-of-service classifiers ieee-802.1 fcoe_p5_iscsi forwarding-class fcoe1 loss-priority low code-points 101 set class-of-service classifiers ieee-802.1 fcoe_p5_iscsi forwarding-class best-effort loss-priority high code-points 000 set class-of-service classifiers ieee-802.1 fcoe_p5_iscsi forwarding-class best-effort loss-priority high code-points 001 set class-of-service classifiers ieee-802.1 fcoe_p5_iscsi forwarding-class best-effort loss-priority high code-points 010 set class-of-service classifiers ieee-802.1 fcoe_p5_iscsi forwarding-class best-effort loss-priority high code-points 011 set class-of-service classifiers ieee-802.1 fcoe_p5_iscsi forwarding-class best-effort loss-priority high code-points 110 set class-of-service classifiers ieee-802.1 fcoe_p5_iscsi forwarding-class best-effort loss-priority high code-points 111 set class-of-service classifiers ieee-802.1 fcoe_p3_p5 forwarding-class fcoe loss-priority low code-points 011 set class-of-service classifiers ieee-802.1 fcoe_p3_p5 forwarding-class fcoe1 loss-priority low code-points 101 set class-of-service classifiers ieee-802.1 fcoe_p3_p5 forwarding-class best-effort loss-priority high code-points 000 set class-of-service classifiers ieee-802.1 fcoe_p3_p5 forwarding-class best-effort loss-priority high code-points 001 set class-of-service classifiers ieee-802.1 fcoe_p3_p5 forwarding-class best-effort loss-priority high code-points 010 set class-of-service classifiers ieee-802.1 fcoe_p3_p5 forwarding-class best-effort loss-priority high code-points 100 set class-of-service classifiers ieee-802.1 fcoe_p3_p5 forwarding-class best-effort loss-priority high code-points 110 set class-of-service classifiers ieee-802.1 fcoe_p3_p5 forwarding-class best-effort loss-priority high code-points 111 set class-of-service classifiers ieee-802.1 iscsi_classifier forwarding-class iscsi loss-priority low code-points 100 set class-of-service classifiers ieee-802.1 iscsi_classifier forwarding-class best-effort loss-priority high code-points 000 set class-of-service classifiers ieee-802.1 iscsi_classifier forwarding-class best-effort loss-priority high code-points 001 set class-of-service classifiers ieee-802.1 iscsi_classifier forwarding-class best-effort loss-priority high code-points 010 set class-of-service classifiers ieee-802.1 iscsi_classifier forwarding-class best-effort loss-priority high code-points 011 set class-of-service classifiers ieee-802.1 iscsi_classifier forwarding-class best-effort loss-priority high code-points 101 set class-of-service classifiers ieee-802.1 iscsi_classifier forwarding-class best-effort loss-priority high code-points 110 set class-of-service classifiers ieee-802.1 iscsi_classifier forwarding-class best-effort loss-priority high code-points 111 set class-of-service interfaces xe-0/0/31 unit 0 classifiers ieee-802.1 fcoe_p3_iscsi set class-of-service interfaces xe-0/0/32 unit 0 classifiers ieee-802.1 fcoe_p5_iscsi set class-of-service interfaces xe-0/0/33 unit 0 classifiers ieee-802.1 fcoe_p3_p5set class-of-service interfaces xe-0/0/34 unit 0 classifiers ieee-802.1 iscsi_classifier set class-of-service congestion-notification-profile fcoe_p3_cnp input ieee-802.1 code-point 011 pfc mru 2240 set class-of-service congestion-notification-profile fcoe_p3_cnp input ieee-802.1 code-point 100 pfc set class-of-service congestion-notification-profile fcoe_p3_cnp input cable-length 100 set class-of-service congestion-notification-profile fcoe_p5_cnp input ieee-802.1 code-point 100 pfc set class-of-service congestion-notification-profile fcoe_p5_cnp input ieee-802.1 code-point 101 pfc mru 2240 set class-of-service congestion-notification-profile fcoe_p5_cnp input cable-length 150 set class-of-service congestion-notification-profile fcoe_p5_cnp output ieee-802.1 code-point 100 pfc flow-control-queue 4 set class-of-service congestion-notification-profile fcoe_p5_cnp output ieee-802.1 code-point 101 pfc flow-control-queue 5 set class-of-service congestion-notification-profile fcoe_p3_p5_cnp input ieee-802.1 code-point 011 pfc mru 2240 set class-of-service congestion-notification-profile fcoe_p3_p5_cnp input ieee-802.1 code-point 101 pfc mru 2240 set class-of-service congestion-notification-profile fcoe_p3_p5_cnp input cable-length 100 set class-of-service congestion-notification-profile fcoe_p3_p5_cnp output ieee-802.1 code-point 011 pfc flow-control-queue 3 set class-of-service congestion-notification-profile fcoe_p3_p5_cnp output ieee-802.1 code-point 101 pfc flow-control-queue 5 set class-of-service congestion-notification-profile iscsi_cnp input ieee-802.1 code-point 100 pfc set class-of-service congestion-notification-profile iscsi_cnp input cable-length 100 set class-of-service interfaces xe-0/0/31 congestion-notification-profile fcoe_p3_cnp set class-of-service interfaces xe-0/0/32 congestion-notification-profile fcoe_p5_cnp set class-of-service interfaces xe-0/0/33 congestion-notification-profile fcoe_p3_p5_cnp set class-of-service interfaces xe-0/0/34 congestion-notification-profile iscsi_cnp set applications application iscsi_app protocol tcp destination-port 3260 set applications application fcoe_app ether-type 0x8906 set policy-options application-maps dcbx_iscsi_fcoe_app_map application iscsi_app code-points 100 set policy-options application-maps dcbx_iscsi_fcoe_app_map application fcoe_app code-points [011 101] set protocols dcbx interface xe-0/0/31 application-map dcbx_iscsi_fcoe_app_map set protocols dcbx interface xe-0/0/32 application-map dcbx_iscsi_fcoe_app_map set protocols dcbx interface xe-0/0/33 application-map dcbx_iscsi_fcoe_app_map set protocols dcbx interface xe-0/0/34 application-map dcbx_iscsi_fcoe_app_map
Procedure
Step-by-Step Procedure
To configure two lossless forwarding classes for FCoE traffic and one lossless forwarding class for iSCSI traffic, classify the traffic into the three forwarding classes, configure congestion notification profiles to enable PFC on the FCoE priorities and output queues, and configure DCBX application protocol TLV exchange for traffic on both FCoE priorities:
Configure lossless forwarding classes
iscsifor iSCSI traffic andfcoe1for FCoE traffic (this example uses the defaultfcoeforwarding class as the other lossless FCoE forwarding class) and map them to output queues:[edit class-of-service] user@switch# set forwarding-classes class iscsi queue-num 4 no-loss user@switch# set forwarding-classes class fcoe1 queue-num 5 no-loss
Configure the ingress classifier (
fcoe_p3_iscsi) for interfacexe-0/0/31. The classifier maps the FCoE priority (code point011) to lossless FCoE forwarding classfcoeand the iSCSI priority (code point100) to lossless iSCSI forwarding classiscsi, and traffic of other priorities to thebest-effortforwarding class with a packet loss priority ofhigh:[edit class-of-service classifiers] user@switch# set ieee-802.1 fcoe_p3_iscsi forwarding-class fcoe loss-priority low code-points 011 user@switch# set ieee-802.1 fcoe_p3_iscsi forwarding-class iscsi loss-priority low code-points 100 user@switch# set ieee-802.1 fcoe_p3_iscsi forwarding-class best-effort loss-priority high code-points 000 user@switch# set ieee-802.1 fcoe_p3_iscsi forwarding-class best-effort loss-priority high code-points 001 user@switch# set ieee-802.1 fcoe_p3_iscsi forwarding-class best-effort loss-priority high code-points 010 user@switch# set ieee-802.1 fcoe_p3_iscsi forwarding-class best-effort loss-priority high code-points 101 user@switch# set ieee-802.1 fcoe_p3_iscsi forwarding-class best-effort loss-priority high code-points 110 user@switch# set ieee-802.1 fcoe_p3_iscsi forwarding-class best-effort loss-priority high code-points 111
Configure the ingress classifier (
fcoe_p5_iscsi) for interfacexe-0/0/32. The classifier maps the FCoE priority (code point101) to lossless FCoE forwarding classfcoe1and the iSCSI priority (code point100) to lossless iSCSI forwarding classiscsi, and traffic of other priorities to thebest-effortforwarding class with a packet loss priority ofhigh:[edit class-of-service classifiers] user@switch# set ieee-802.1 fcoe_p5_iscsi forwarding-class iscsi loss-priority low code-points 100 user@switch# set ieee-802.1 fcoe_p5_iscsi forwarding-class fcoe1 loss-priority low code-points 101 user@switch# set ieee-802.1 fcoe_p5_iscsi forwarding-class best-effort loss-priority high code-points 000 user@switch# set ieee-802.1 fcoe_p5_iscsi forwarding-class best-effort loss-priority high code-points 001 user@switch# set ieee-802.1 fcoe_p5_iscsi forwarding-class best-effort loss-priority high code-points 010 user@switch# set ieee-802.1 fcoe_p5_iscsi forwarding-class best-effort loss-priority high code-points 011 user@switch# set ieee-802.1 fcoe_p5_iscsi forwarding-class best-effort loss-priority high code-points 110 user@switch# set ieee-802.1 fcoe_p5_iscsi forwarding-class best-effort loss-priority high code-points 111
Configure the ingress classifier (
fcoe_p3_p5) for interfacexe-0/0/33. The classifier maps the two FCoE priorities (code points011and101) to lossless FCoE forwarding classesfcoeandfcoe1, respectively, and traffic of other priorities to thebest-effortforwarding class with a packet loss priority ofhigh:[edit class-of-service classifiers] user@switch# set ieee-802.1 fcoe_p3_p5 forwarding-class fcoe loss-priority low code-points 011 user@switch# set ieee-802.1 fcoe_p3_p5 forwarding-class fcoe1 loss-priority low code-points 101 user@switch# set ieee-802.1 fcoe_p3_p5 forwarding-class best-effort loss-priority high code-points 000 user@switch# set ieee-802.1 fcoe_p3_p5 forwarding-class best-effort loss-priority high code-points 001 user@switch# set ieee-802.1 fcoe_p3_p5 forwarding-class best-effort loss-priority high code-points 010 user@switch# set ieee-802.1 fcoe_p3_p5 forwarding-class best-effort loss-priority high code-points 100 user@switch# set ieee-802.1 fcoe_p3_p5 forwarding-class best-effort loss-priority high code-points 110 user@switch# set ieee-802.1 fcoe_p3_p5 forwarding-class best-effort loss-priority high code-points 111
Configure the ingress classifier (
iscsi_classifier) for interfacexe-0/0/34. The classifier maps the iSCSI priority (code point101) to lossless iSCSI forwarding classiscsi, and traffic of other priorities to thebest-effortforwarding class with a packet loss priority ofhigh:[edit class-of-service classifiers] user@switch# set ieee-802.1 iscsi_classifier forwarding-class iscsi loss-priority low code-points 100 user@switch# set ieee-802.1 iscsi_classifier forwarding-class best-effort loss-priority high code-points 000 user@switch# set ieee-802.1 iscsi_classifier forwarding-class best-effort loss-priority high code-points 001 user@switch# set ieee-802.1 iscsi_classifier forwarding-class best-effort loss-priority high code-points 010 user@switch# set ieee-802.1 iscsi_classifier forwarding-class best-effort loss-priority high code-points 011 user@switch# set ieee-802.1 iscsi_classifier forwarding-class best-effort loss-priority high code-points 101 user@switch# set ieee-802.1 iscsi_classifier forwarding-class best-effort loss-priority high code-points 110 user@switch# set ieee-802.1 iscsi_classifier forwarding-class best-effort loss-priority high code-points 111
Apply each classifier to the appropriate interface:
[edit class-of-service] user@switch# set interfaces xe-0/0/31 unit 0 classifiers ieee-802.1 fcoe_p3_iscsi user@switch# set interfaces xe-0/0/32 unit 0 classifiers ieee-802.1 fcoe_p5_iscsi user@switch# set interfaces xe-0/0/33 unit 0 classifiers ieee-802.1 fcoe_p3_p5 user@switch# set interfaces xe-0/0/34 unit 0 classifiers ieee-802.1 iscsi_classifier
Configure the CNP input stanza for interface xe-0/0/31 to enable PFC on the FCoE and iSCSI priorities that the interface handles (code points 011 and 100), set the MRU value for the FCoE traffic (2240 bytes), and set the cable length value (100 meters). No output stanza is needed because queues 3 and 4 are paused by default on priorities 3 and 4, respectively, and we are not explicitly configuring output queue flow control for any other queues.
[edit class-of-service] user@switch# set congestion-notification-profile fcoe_p3_cnp input ieee-802.1 code-point 011 pfc mru 2240 user@switch# set congestion-notification-profile fcoe_p3_cnp input ieee-802.1 code-point 100 pfc user@switch# set congestion-notification-profile fcoe_p3_cnp input cable-length 100
Configure the CNP for interface xe-0/0/32. The input stanza enables PFC on the FCoE priority (code point 101), sets the MRU value for FCoE traffic (2240 bytes), enables PFC on the iSCSI priority (code point 100), and sets the cable length value (150 meters). The output stanza configures flow control on output queue 5 on the FCoE priority and on output queue 4 on the iSCSI priority:
[edit class-of-service] user@switch# set congestion-notification-profile fcoe_p5_cnp input ieee-802.1 code-point 100 pfc user@switch# set congestion-notification-profile fcoe_p5_cnp input ieee-802.1 code-point 101 pfc mru 2240 user@switch# set congestion-notification-profile fcoe_p5_cnp input cable-length 150 user@switch# set congestion-notification-profile fcoe_p5_cnp output ieee-802.1 code-point 100 pfc flow-control-queue 4 user@switch# set congestion-notification-profile fcoe_p5_cnp output ieee-802.1 code-point 101 pfc flow-control-queue 5
Configure the CNP for interface xe-0/0/33. The input stanza enables PFC on the FCoE priorities (IEEE 802.1p code points 011 and 101), sets the MRU value (2240 bytes), and sets the cable length value (100 meters). The output stanza configures flow control on output queues 3 and 5 on the FCoE priorities:
[edit class-of-service] user@switch# set congestion-notification-profile fcoe_p3_p5_cnp input ieee-802.1 code-point 011 pfc mru 2240 user@switch# set congestion-notification-profile fcoe_p3_p5_cnp input ieee-802.1 code-point 101 pfc mru 2240 user@switch# set congestion-notification-profile fcoe_p3_p5_cnp input cable-length 100 user@switch# set congestion-notification-profile fcoe_p3_p5_cnp output ieee-802.1 code-point 011 pfc flow-control-queue 3 user@switch# set congestion-notification-profile fcoe_p3_p5_cnp output ieee-802.1 code-point 101 pfc flow-control-queue 5
Configure the CNP input stanza for interface xe-0/0/34 to enable PFC on the iSCSI priority (code point 100) and set the cable length value (100 meters). No output stanza is needed because queue 4 is paused by default on priority 4, and we are not explicitly configuring output queue flow control for any other queues.
[edit class-of-service] user@switch# set congestion-notification-profile iscsi_cnp input ieee-802.1 code-point 100 pfc user@switch# set congestion-notification-profile iscsi_cnp input cable-length 100
Apply each CNP to the appropriate interface:
[edit class-of-service] user@switch# set interfaces xe-0/0/31 congestion-notification-profile fcoe_p3_cnp user@switch# set interfaces xe-0/0/32 congestion-notification-profile fcoe_p5_cnp user@switch# set interfaces xe-0/0/33 congestion-notification-profile fcoe_p3_p5_cnp user@switch# set interfaces xe-0/0/34 congestion-notification-profile iscsi_cnp
Configure the DCBX applications for FCoE and iSCSI to map to the interfaces so that DCBX can exchange application protocol TLVs on the IEEE 802.1p priorities used for FCoE and iSCSI traffic:
[edit] user@switch# set applications application fcoe_app ether-type 0x8906 user@switch# set applications application iscsi_app protocol tcp destination-port 3260
Configure a DCBX application map to map the FCoE and iSCSI applications to the correct priorities:
[edit] user@switch# set policy-options application-maps dcbx_iscsi_fcoe_app_map application fcoe_app code-points [011 101] user@switch# set policy-options application-maps dcbx_iscsi_fcoe_app_map application iscsi_app code-points 100
Apply the application map to the interfaces so that DCBX exchanges FCoE application TLVs on the correct code points:
[edit] user@switch# set protocols dcbx interface xe-0/0/31 application-map dcbx_iscsi_fcoe_app_map user@switch# set protocols dcbx interface xe-0/0/32 application-map dcbx_iscsi_fcoe_app_map user@switch# set protocols dcbx interface xe-0/0/33 application-map dcbx_iscsi_fcoe_app_map user@switch# set protocols dcbx interface xe-0/0/34 application-map dcbx_iscsi_fcoe_app_map
Verification
To verify the configuration and proper operation of the lossless forwarding classes and IEEE 802.1p priorities, perform these tasks:
- Verifying the Forwarding Class Configuration
- Verifying the Behavior Aggregate Classifier Configuration
- Verifying the PFC Flow Control Configuration (CNP)
- Verifying the Interface Configuration
- Verifying the DCBX Application Configuration
- Verifying the DCBX Application Map Configuration
- Verifying the DCBX Application Protocol Exchange Interface Configuration
Verifying the Forwarding Class Configuration
Purpose
Verify that the lossless forwarding classes iscsi and fcoe1 have been created and that the default lossless
forwarding class fcoe is still enabled for lossless transport.
Action
Show the forwarding class configuration by using the
operational command show class-of-service forwarding class:
user@switch> show class-of-service forwarding-class Forwarding class ID Queue Policing priority No-Loss best-effort 0 0 normal Disabled fcoe 1 3 normal Enabled iscsi 2 4 normal Enabled network-control 3 7 normal Disabled fcoe1 4 5 normal Enabled mcast 8 8 normal Disabled
Meaning
The show class-of-service forwarding-class command shows all of the forwarding classes. The command output
shows that the iscsi and fcoe1 forwarding classes
are configured on output queues 4 and 5, respectively,
with the no-loss packet drop attribute enabled.
Because we did not explicitly configure the default fcoe forwarding class, it remains in its default state (lossless configuration).
Verifying the Behavior Aggregate Classifier Configuration
Purpose
Verify that the four classifiers map the forwarding classes to the correct IEEE 802.1p code points (priorities) and packet loss priorities.
Action
List the classifiers configured to support lossless
FCoE transport using the operational mode command show class-of-service
classifier:
user@switch> show class-of-service classifier Classifier: fcoe_p3_iscsi, Code point type: ieee-802.1, Index: 13915 Code point Forwarding class Loss priority 011 fcoe low 100 iscsi low Classifier: fcoe_p5_iscsi, Code point type: ieee-802.1, Index: 62035 Code point Forwarding class Loss priority 100 iscsi low 101 fcoe1 low Classifier: fcoe_p3_p5, Code point type: ieee-802.1, Index: 17774 Code point Forwarding class Loss priority 011 fcoe low 101 fcoe1 low Classifier: iscsi_classifier, Code point type: ieee-802.1, Index: 31635 Code point Forwarding class Loss priority 100 iscsi low
Meaning
The show class-of-service classifier command
shows the IEEE 802.1p code points and the loss priorities that are
mapped to the forwarding classes in each classifier. The command output
shows that there are four classifiers, fcoe_p3_iscsi, fcoe_p5_iscsi, fcoe_p3_p5, and iscsi_classifier.
Classifier fcoe_p3_iscsi maps code point 011 (priority 3) to default lossless forwarding class fcoe and a packet loss priority of low, and code point 100 (priority 4) to explicitly configured lossless forwarding
class iscsi, and all other priorities to the best-effort forwarding class with a packet loss priority of high.
Classifier fcoe_p5_iscsi maps code point 100 to explicitly configured forwarding class iscsi and a
packet loss priority of low, and code point 101 (priority 5) to explicitly configured lossless forwarding class fcoe1 and a packet loss priority of low, and all
other priorities to the best-effort forwarding class with
a packet loss priority of high.
Classifier fcoe_p3_p5 maps code point 011 to default lossless forwarding class fcoe and a packet
loss priority of low, and maps code point 101 to explicitly configured lossless forwarding class fcoe1 and a packet loss priority of low.The classifier maps
all other priorities to the best-effort forwarding class
with a packet loss priority of high.
Classifier iscsi_classifier maps code point 100 to explicitly configured forwarding class iscsi and a packet loss priority of low, and all other priorities
to the best-effort forwarding class with a packet loss
priority of high.
Verifying the PFC Flow Control Configuration (CNP)
Purpose
Verify that PFC is enabled on the correct input priorities and that flow control is configured on the correct output queues and priorities in each CNP.
Action
List the congestion notification profiles using the
operational mode command show class-of-service congestion-notification:
user@switch> show class-of-service congestion-notification
Name: fcoe_p3_cnp, Index: 12037
Type: Input
Cable Length: 100 m
Priority PFC MRU
000 Disabled
001 Disabled
010 Disabled
011 Enabled 2240
100 Enabled 9216
101 Disabled
110 Disabled
111 Disabled
Type: Output
Priority Flow-Control-Queues
000
0
001
1
010
2
011
3
100
4
101
5
110
6
111
7
Name: fcoe_p3_p5_cnp, Index: 46484
Type: Input
Cable Length: 100 m
Priority PFC MRU
000 Disabled
001 Disabled
010 Disabled
011 Enabled 2240
100 Disabled
101 Enabled 2240
110 Disabled
111 Disabled
Type: Output
Priority Flow-Control-Queues
011
3
101
5
Name: fcoe_p5_cnp, Index: 12133
Type: Input
Cable Length: 150 m
Priority PFC MRU
000 Disabled
001 Disabled
010 Disabled
011 Disabled
100 Enabled 9216
101 Enabled 2240
110 Disabled
111 Disabled
Type: Output
100
4
101
5
Name: iscsi_cnp, Index: 19342
Type: Input
Cable Length: 100 m
Priority PFC MRU
000 Disabled
001 Disabled
010 Disabled
011 Disabled
100 Enabled 9216
101 Disabled
110 Disabled
111 Disabled
Type: Output
Priority Flow-Control-Queues
000
0
001
1
010
2
011
3
100
4
101
5
110
6
111
7
Meaning
The show class-of-service congestion-notification command shows the input and output stanzas of the four CNPs.
For CNP fcoe_p3_cnp, the input stanza shows that
PFC is enabled on IEEE 802.1p code point 011 (priority 3)
with an MRU of 2240 bytes, and cable length of 100 meters. The input stanza also shows that PFC is enabled on code
point 100 (priority 4) with the default MRU value
of 9216 bytes. The CNP output stanza shows the default
mapping of priorities to output queues because no explicit output
CNP is configured.
By default, only queues 3 and 4 are enabled respond
to pause messages from the connected peer. For queue 3 to respond
to pause messages, priority 3 (code point 011) must be enabled
for PFC in the input stanza. For queue 4 to respond to pause
messages, priority 4 (code point 100) must be enabled for
PFC in the input stanza. In this example, only queues 3 and 4
respond to pause messages from the connected peer on interfaces that
use CNP fcoe_p3_cnp because the input stanza enables PFC
only on priorities 3 and 4.
For CNP fcoe_p3_p5_cnp, the input stanza shows that
PFC is enabled on code points 011 and 101 (priority 5),
the MRU is 2240 bytes on both priorities, and the cable
length is 100 meters. The CNP output stanza shows that
output flow control is configured on queues 3 and 5 for code points 011 and 101, respectively.
For CNP fcoe_p5_cnp, the input stanza shows that
PFC is enabled on code points 100 and 101. The MRU for code point 101 (FCoE traffic) is 2240 bytes and the MRU for code point 100 is 9216. The interface cable length is 150 meters. The CNP output
stanza shows that output flow control is configured on queue 4 for code point 100 and on queue 5 for
code point 101.
For CNP iscsi_cnp, the input stanza shows that PFC
is enabled on code point 100, the MRU value is 9216 bytes, and the interface cable length is 100 meters.
The CNP output stanza shows the default mapping of priorities to output
queues because no explicit output CNP is configured.
Verifying the Interface Configuration
Purpose
Verify that the correct classifiers and congestion notification profiles are configured on the correct interfaces.
Action
List the ingress interfaces using the operational mode
commands show configuration class-of-service interfaces xe-0/0/31, show configuration class-of-service interfaces xe-0/0/32, show configuration class-of-service interfaces xe-0/0/33, and show configuration class-of-service interfaces xe-0/0/34:
user@switch> show configuration class-of-service interfaces xe-0/0/31
congestion-notification-profile fcoe_p3_cnp;
unit 0 {
classifiers {
ieee-802.1 fcoe_p3_iscsi;
}
}
user@switch> show configuration class-of-service interfaces xe-0/0/32
congestion-notification-profile fcoe_p5_cnp;
unit 0 {
classifiers {
ieee-802.1 fcoe_p5_iscsi;
}
}
user@switch> show configuration class-of-service interfaces xe-0/0/33
congestion-notification-profile fcoe_p3_p5_cnp;
unit 0 {
classifiers {
ieee-802.1 fcoe_p3_p5;
}
}
user@switch> show configuration class-of-service interfaces xe-0/0/34
congestion-notification-profile iscsi_cnp;
unit 0 {
classifiers {
ieee-802.1 iscsi_classifier;
}
}
Meaning
The show configuration class-of-service interfaces
xe-0/0/31 command shows that the congestion notification profile fcoe_p3_cnp is configured on the interface, and that the IEEE
802.1p classifier associated with the interface is fcoe_p3_iscsi.
The show configuration class-of-service interfaces xe-0/0/32 command shows that the congestion notification profile fcoe_p5_cnp is configured on the interface, and that the IEEE 802.1p classifier
associated with the interface is fcoe_p5_iscsi.
The show configuration class-of-service interfaces xe-0/0/33 command shows that the congestion notification profile fcoe_p3_p5_cnp is configured on the interface, and that the IEEE 802.1p classifier
associated with the interface is fcoe_p3_p5.
The show configuration class-of-service interfaces xe-0/0/34 command shows that the congestion notification profile iscsi_cnp is configured on the interface, and that the IEEE 802.1p classifier
associated with the interface is iscsi_classifier.
Verifying the DCBX Application Configuration
Purpose
Verify that the DCBX applications for FCoE and iSCSI are configured.
Action
List the DCBX applications by using the configuration
mode command show applications:
user@switch# show applications
application iscsi_app {
protocol tcp;
destination-port 3260;
}
application fcoe_app {
ether-type 0x8906;
Meaning
The show applications configuration mode
command shows all of the configured applications. The output shows
that the application iscsi_app is configured with a protocol
value of tcp and a destination port value of 3260, and that the application fcoe_app is configured with
an EtherType of 0x8906 (the correct EtherType for FCoE
traffic).
Verifying the DCBX Application Map Configuration
Purpose
Verify that the application map is configured.
Action
List the application maps by using the configuration
mode command show policy-options application-maps:
user@switch# show policy-options application-maps
dcbx-iscsi-fcoe-app-map {
application iscsi_app code-points 100;
application fcoe_app code-points [011 101];
}
Meaning
The show policy-options application-maps configuration mode command lists all of the configured application
maps and the applications that belong to each application map. The
output shows that there is one application map named dcbx-iscsi-fcoe_app_map. It consists of the application iscsi_app mapped to code
point 100 and the application fcoe_app mapped
to code points 011 and 101.
Verifying the DCBX Application Protocol Exchange Interface Configuration
Purpose
Verify that the application maps are applied to the correct interfaces.
Action
List the application maps on each interface using the
configuration mode command show protocols dcbx:
user@switch# show protocols dcbx
interface xe-0/0/31.0 {
application-map dcbx-iscsi-fcoe-app-map;
}
interface xe-0/0/32.0 {
application-map dcbx-iscsi-fcoe-app-map;
}
interface xe-0/0/33.0 {
application-map dcbx-iscsi-fcoe-app-map;
}
interface xe-0/0/34.0 {
application-map dcbx-iscsi-fcoe-app-map;
}
Meaning
The show protocols dcbx configuration mode
command lists the application map association with interfaces. The
output shows that all four interfaces use the application map dcbx-iscsi-fcoe-app-map.