Globally-configured QoS

By default, the show qos output for following global QoS classifiers may display No-override for QoS marking: IP Precedence, IP Diffserv, Layer-3 Protocol, VLAN ID, and Source-port (see Output for the show qos command). No-override means that the global QoS policy used to mark matching packets does not assign an 802.1p value.

Output for the show qos command shows the global QoS configurations on the switch that are configured with the VLAN ID classifier. Note that non-default 802.1p priorities have been configured for VLAN IDs 22 and 33; packets received on VLAN 1 are managed with the default settings, as described in the two bulleted items above.

HP Switch(config)# show qos vlan-priority
  VLAN priorities
  VLAN ID Apply rule  | DSCP   Priority
  ------- ----------- + ------ -----------
  1       No-override |        No-override
  22      Priority    |        0
  33      DSCP        | 000010 6

When you use TCP or UDP and a layer 4 Application port number as a global QoS classifier, traffic carrying the specified TCP/UDP port numbers is marked with a specified priority level, without regard for any other QoS classifiers in the switch. You can configure up to 50 TCP/UDP application port numbers as QoS classifiers.

	NOTE: Global TCP/UDP classifiers are supported on IPv4 only.

Operating notes on using TCP/UDP port ranges

• Only 6 concurrent policies are possible when using unique ranges. The number of policies allowed is less if ACLs are also using port ranges.

• You cannot have ranges that include any port numbers that have been configured as part of another QoS application port number policy.

• An error message is generated if there are not enough hardware resources available when configuring a policy.

• The entire range of configured port numbers must be specified when using the no form of the command, for example:

  HP Switch(config)#: qos udp-port range 1300 1399 dscp 001110
  
  HP Switch(config)#: no qos range 1300 1399
  

The following example displays the following configuration for TCP and UDP port prioritization:

Configuration for TCP and UDP port prioritization

TCP/UDP port	802.1p priority for TCP	802.1p priority for UDP
TCP Port 23 (Telnet)	7	7
UDP Port 23 (Telnet)	7	7
TCP Port 80 (World Wide Web HTTP)	2	2
UDP Port 80 (World Wide Web HTTP)	1	1

Configuring 802.1p priority assignments on TCP/UDP ports

The global IP-device classifier enables you to configure up to 300 IP addresses to select IP packets according to source or destination address.

IPv6 Support: IP device classifiers are supported on IPv4 packets only.

When a globally-configured IP-device address has the highest precedence in the switch for traffic addressed to or from the device, traffic received on the switch with the configured IP address is marked with the specified priority level. You can configure different IP-device classifiers with different priority levels.

	NOTE: QoS IP-device restriction: The configuration of a QoS IP-device priority on the Management VLAN IP address (if configured) is not supported. If no Management VLAN is configured, the configuration of a QoS IP-device priority on the default VLAN IP address is not supported.

This global QoS packet-marking option assigns an 802.1p priority to all IP packets that have the specified IP address as either a source or destination. If both the source and destination addresses match, the priority configured for the IP destination address has precedence.

Syntax (IPv4):

Syntax (IPv6):

HP Switch(config)#: qos device-priority 10.28.31.1 priority 7
HP Switch(config)#: qos device-priority 10.28.31.130 priority 5
HP Switch(config)#: qos device-priority ipv4 10.28.32.100/24 priority 1
HP Switch(config)#: qos device-priority 2001:db8:2:1:212:79ff:fe88:a100 priority
HP Switch(config)#: qos device-priority ipv6 2001:db8:3:3::/64 priority 1
HP Switch(config)#: show qos device-priority

  Device priorities

  Device Address                                Apply rule | DSCP  Priority
  --------------------------------------------  ---------- + ------ -----------
  10.28.31.1                                    Priority   |        7
  10.28.31.130                                  Priority   |        5
  10.28.32.100/24                               Priority   |        1
  2001:db8:2:1:212:79ff:fe88:a100               Priority   |        3
  2001:db8:3:3::/64                             Priority   |        1

This global QoS packet-marking option assigns a previously configured DSCP policy (codepoint and 802.1p priority) to outbound IP packets having the specified IP address or subnet mask in the source or destination field of their packet header. The switch:

Creating a policy based on IP address:

This procedure creates a DSCP policy for IPv4 packets carrying the selected IP address (source or destination).

Syntax:

Syntax:

Example:

This example shows how to assign the following DSCP policies to the packets that match the specified global IP-device classifiers:

The switch applies the DSCP policies in Assigning 802.1p priorities to the selected DSCPs to IP packets with the specified IP addresses and subnet masks (source or destination) received in the switch. The switch manages the packets as follows:

The global IP Type-of-Service classifier enables you to classify and mark IP packets according to the following modes:

IPv4 packet headers contain a Type of Service (ToS) byte. A ToS/Traffic Class byte includes a DSCP codepoint and precedence bits:

	NOTE: Using a global IP-Precedence classifier to prioritize IP packets relies on priorities set in upstream devices and applications.

DSCP codepoint and precedence bits shows the difference between the diffserv bits and precedence bits in an IPv4 ToS byte. Note that:

DSCP codepoint and precedence bits

If a device or application upstream of the switch sets the precedence bits in the ToS/Traffic Class byte of IPv4 packets, you can use this global packet marking option to prioritize packets for outbound port queues. If the outbound packets are in a tagged VLAN, this priority is carried as an 802.1p value to the adjacent downstream devices.

Syntax:

Using the IP-precedence classifier, prioritization of outbound packets relies on the IP-Precedence bit setting that IP packets carry with them from upstream devices and applications. To configure and verify this option:

Enabling ToS IP-precedence prioritization

To change from IP-precedence to IP-Diffserv mode, follow the procedure in Assigning an 802.1p priority for a Global IP-Diffserv classifier, which automatically disables IP-Precedence. To disable IP-Precedence without enabling the IP-Diffserv option, enter the no qos type-of-service command.

One of the best uses for this global QoS packet-marking option is on an interior switch where you want to honor (continue) a policy set on an edge switch. The IP-diffserv classifier enables you to select incoming packets having a specific DSCP and forward these packets with the desired 802.1p priority. For example, if an edge switch “A” marks all packets received on port 5 with a particular DSCP, you can configure a downstream (interior) switch “B” to handle such packets with the desired priority (regardless of whether 802.1Q tagged VLANs are in use).

Interior switch B honors the policy established in edge switch A

To do so, assign the desired 802.1p priority to the same codepoint that the upstream or edge switch assigns to the selected packets. When the downstream switch receives an IP packet carrying one of these codepoints, it assigns the configured priority to the packet and sends it out the appropriate outbound port queue. (The packet retains the codepoint it received from the upstream or edge switch). You can use this option concurrently with the diffserv DSCP Policy option (described later in this section), as long as the DSCPs specified in the two options do not match.

Configuration notes:

Different applications may use the same DSCP in their IP packets. Also, the same application may use multiple DSCPs if the application originates on different clients, servers, or other devices. Using an edge switch enables you to select the desired packets and mark them with predictable DSCPs that can be used by downstream switches to honor policies set in the edge switch.

When enabled, the switch applies direct 802.1p prioritization to all packets having codepoints that meet these prerequisites:

Thus, the switch does not allow the same incoming codepoint (DSCP) to be used simultaneously for directly assigning an 802.1p priority and also assigning a DSCP policy. For a given incoming codepoint, if you configure one option and then the other, the second overwrites the first.

To use this option:

Syntax:

For example, an edge switch “A” in an untagged VLAN assigns a DSCP of 000110 on IP packets it receives on port 6, and handles the packets with high priority (7). When these packets reach interior switch “B” you want the switch to handle them with the same high priority. To enable this operation you would configure an 802.1p priority of 7 for packets received with a DSCP of 000110. ToS diff-services must be enabled:

Viewing the codepoints available for 802.1p priority assignments

ToS configuration that enables both 802.1p priority and DSCP policy assignment

The preceding section describes how to forward an 802.1p priority level set by an edge (or upstream) switch. This section describes how to use a global IP-Diffserv classifier to mark matching packets with a new DSCP policy. A DSCP policy consists of a DSCP codepoint and an associated 802.1p priority.

You can use a global IP-Diffserv classifier to mark a DSCP policy at the same time with a global IP-Diffserv classifier that marks an 802.1p priority if different DSCP codepoints are configured with each classifier.

To use a global IP-Diffserv classifier to mark matching packets with a new DSCP policy, follow these steps:

Syntax:

Syntax:

Syntax:

Syntax:

Syntax:

Example:

The following example shows how to configure new DSCP policies on matching packets with the specified DSCP codepoints.

The next table shows the difference in how global IP-Precedence and IP-Diffserv classifiers are implemented in the switch.

When a global Layer-3 Protocol classifier is configured as the highest-precedence classifier and the switch receives traffic carrying the specified protocol, matching packets are assigned the priority configured for the classifier.

This global QoS packet-marking option assigns an 802.1p priority to outbound packets having the specified Layer-3 protocol.

Syntax:

Syntax:

Syntax:

Configuring global Layer-3 protocol classifiers

To configure the following global Layer-3 protocol classifiers:

1. Configure QoS protocol classifiers with IP at 0 (normal), ARP at 5 (medium), and AppleTalk at 7 (high) and display the QoS protocol configuration.

2. Disable the QoS IP protocol classifier, downgrade the ARP priority to 4, and again display the QoS protocol configuration.

The following example shows the necessary configuration commands.

Adding, viewing, removing, and changing QoS protocol classifiers

The global VLAN-ID (VID) classifier allows you to use up to 4094 VLAN IDs to match packets. When a particular VLAN-ID classifier has the highest precedence in the switch, traffic received in the VLAN is marked with the configured priority level. You can configure different global VLAN-ID classifiers to mark packets with different priority levels.

The global QoS packet-marking options for packets that carry a specified VLAN-ID include:

For information on QoS operation when other global QoS classifiers match the same traffic, see Globally-configured packet classification.)

	NOTE: Regarding configuration: A global VLAN-ID classifier marks priority levels only in packets received on static VLANs. Packets received in a dynamic VLAN created by GVRP operation are not marked by a global VLAN-ID classifier. The VLAN ID used as a global QoS classifier must currently exist on the switch. If you remove a VLAN from the switch, all global QoS configurations that use the VLAN ID for packet marking are also removed.

This global QoS packet-marking option assigns a priority to all outbound packets having the specified VLAN-ID (VID). You can configure this option by either specifying the VLAN-ID ahead of the qos command or moving to the VLAN context for the VLAN you want to configure for priority.

Syntax:

Syntax:

Syntax:

In the following example, 802.1p priorities are assigned to packets received in VLANs 1, 20, 30, and 40.

HP Switch(config)# show vlans

 Status and Counters - VLAN Information

  Maximum VLANs to support : 256
  Primary VLAN : DEFAULT_VLAN
  Management VLAN :

  VLAN ID Name                             | Status     Voice Jumbo
  ------- -------------------------------- + ---------- ----- -----
  1

       DEFAULT_VLAN                     | Port-based No    No
  20

      VLAN_20                          | Static     No    No
  30      VLAN_30                          | Static     No    No
  40

      VLAN_40                          | Static     No    No

Enter the following commands to mark VLAN packets that match the specified VLAN IDs with an 802.1p priority:

HP Switch(config)# vlan 1 qos priority 2
HP Switch(config)# vlan 20 qos priority 5
HP Switch(config)# vlan 30 qos priority 5
HP Switch(config)# vlan 40 qos priority 7

HP Switch(config)# show qos vlan-priority

  VLAN priorities

  VLAN ID Apply rule  | DSCP   Priority
  ------- ----------- + ------ -----------
  20      Priority    |        5
  20      Priority    |        5
  30      Priority    |        5
  40      Priority    |        7

If you later decided to remove VLAN 20 from QoS prioritization, you would enter the following command:

HP Switch(config)# no vlan 20 qos
HP Switch(config)# show qos vlan-priority

  VLAN priorities

  VLAN ID Apply rule  | DSCP   Priority
  ------- ----------- + ------ -----------
  1       Priority    |        2
  20      No-override |        No-override
  30      Priority    |        5
  40      Priority    |        7

This global QoS packet-marking option assigns a previously configured DSCP policy (codepoint and 802.1p priority) to outbound IP packets having the specified VLAN-ID (VID). The switch:

Creating a policy based on VLAN-ID classifier.

Syntax:

Syntax:

Syntax:

Syntax:

Example:

This example, assigns the following DSCP policies (codepoint and associated 802.1p priority) to packets with the specified VLAN IDs:

The switch will now apply the DSCP policies in The completed VID-DSCP priority configuration to packets received on the switch with the specified VLAN-IDs. This means the switch will:

The global QoS source-port classifier allows you to use a packet’s source-port on the switch to mark packets. When a global source-port classifier has the highest precedence in the switch for traffic entering through a port, traffic received on the port is marked with the configured priority level. Different source-port classifiers can have different priority levels.

The global QoS packet marking options for matching packets from a specified source-port include:

For information on QoS operation when other global QoS classifiers match the same traffic, see Globally-configured packet classification.

You can use a RADIUS server to impose a QoS source-port priority during an 802.1X port-access authentication session. See the RADIUS chapter in the Access Security Guide for your switch.

This global QoS packet-marking option assigns a priority to all outbound packets having the specified source-port. You can configure this option by either specifying the source-port ahead of the qos command or moving to the port context for the port you want to configure for priority. (If you are configuring multiple source-ports with the same priority, you may find it easier to use the interface <port-list> command to go to the port context instead of individually configuring the priority for each port.)

Syntax:

Syntax:

Syntax:

For example, suppose that you want to prioritize inbound traffic on the following source-ports:

Enter the following commands to prioritize packets received from the specified source ports:

HP Switch(config)# interface 1-3 qos priority 6
HP Switch(config)# interface 4-5 qos priority 5
HP Switch(config)# interface 6-7 qos priority 3

HP Switch(config)# show qos port-priority

  Port priorities
  
  Port Apply rule  | DSCP   Priority    Radius Override
  ---- ----------  + -----  --------    ---------------
  1    Priority    |        6           No-override
  2    Priority    |        6           No-override
  3    Priority    |        6           No-override
  4    Priority    |        5           No-override
  5    Priority    |        5           No-override
  6    Priority    |        3           No-override
  7    Priority    |        3           No-override
  8    No-override |        No-override No-override
  9    No-override |        No-override No-override
  10   No-override |        No-override No-override

If you later decided to remove source-port 1 from QoS prioritization, you would enter the following command:

HP Switch(config)# no interface 1 qos

HP Switch(config)# show qos port-priority

  Port priorities
  
  Port Apply rule  | DSCP  Priority    Radius Override
  ---- ----------  + ----- --------    ---------------
  1    Priority    |       No-override No-override
  2    Priority    |       6           No-override
  3    Priority    |       6           No-override
  4    Priority    |       5           No-override

This global QoS packet-marking option assigns a previously configured DSCP policy (codepoint and 802.1p priority) to outbound IP packets received from the specified source-ports. The switch:

Creating a policy based on source-port classifiers.

	NOTE: Regarding configuration: You can configure only one DSCP per source-port to mark matching packets. Configuring a new DSCP for a source-port automatically overwrites (replaces) any previous DSCP or 802.1p priority configuration for that source-port classifier.

Syntax:

Syntax:

Syntax:

Syntax:

Example:

In this example, you assign the following DSCP policies (codepoint and associated 802.1p priority) to matching packets with the specified source-ports: