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All Rights Reserved © Alcatel-Lucent 2007
Quality of Service-QOS
Carlos Pereira
Senior Communications Consultant
Alcatel-Lucent 3 October 2007
All Rights Reserved © Alcatel-Lucent 2007VF UK EDN RFI Presentation| September 2007
2. Hardware Queues-6800-9000
3. Recommendations
4. Questions?
1.TCP/IP Where in the packet?
User-Group
All Rights Reserved © Alcatel-Lucent 2007VF UK EDN RFI Presentation| September 2007
TCP/IP Protocol Stack
VERS LEN Type of Service Total Length
Identification Flags Fragment Offset
TTL Protocol Header checksum
source IP address
destination IP address
Options & padding
DATA
All Rights Reserved © Alcatel-Lucent 2007VF UK EDN RFI Presentation| September 2007
IEEE 802.1Q/P/DSCP
SFD SADAType orLength
Data CRC
SFD SA(6)
DA(6)
TypeVLAN
(2)Data(1500)
NewFCS(4)
VLANID(2)
Standard Ethernet or 802.3 Format: max. size 1518 bytes
Basic 802.1Q Format: max. size 1522 bytes
Fixed value identifying frame as a VLAN frame
Variable value identifying VLAN that frame is for
Including 3 bits reserver for CoS
802.1q frame is 4 byteslonger. CRC covers new
longer frame
Type orLength
(2)
All Rights Reserved © Alcatel-Lucent 2007VF UK EDN RFI Presentation| September 2007
QOS -Trusted and Untrusted Ports
> Trusted ports- preserve the P or DSCP settings in the Data flow.
> Untrusted Ports strip QOS settings on Data flows to the port default, or QOS rule.
> Trusted ports normally at Core of network, ( can also be at edge)
All Rights Reserved © Alcatel-Lucent 2007VF UK EDN RFI Presentation| September 2007
Queues
The OmniSwitch 9000 and the OmniSwitch 6850 provide 8 Class of Service (CoS) Queues per egress port for prioritizing and scheduling traffic .
- Traffic is assigned a CoS queue based on it matching a QoS policy rule that has priority
assignment as an action of the rule.
- Traffic received on a trusted port is assigned a CoS queue based on the DSCP value for IP
traffic or based on the 802.1p value for non-IP traffic.
- Traffic received on an untrusted port is assigned a QoS queue based on the default priority
defined for the ingress port on which the traffic is received.
All Rights Reserved © Alcatel-Lucent 2007VF UK EDN RFI Presentation| September 2007
68/9000 QOS
Default
• 8 COS queues per egress port
• 802.1p used to select queues, TOS used for IP packets
• Strict priority for scheduling
Configured by QoS ACL commands
• Condition
• Action
• Rules
All Rights Reserved © Alcatel-Lucent 2007VF UK EDN RFI Presentation| September 2007
68/9000 QOS
QoS Policies
• Classification on L1/L2/L3/L4 (IPV6 included)• Enqueuing in one of the 8 COS queues
Actions
• Drop frames• Change queuing priority• Update TOS/Diffserv and/or 802.1P priority tags• 802.1p/TOS/Diffserv mapping• Per COS max bandwidth (64K bps)• Statistics (# of packets, # of bytes)• Ingress policing / Egress shaping• Multi-actions support
All Rights Reserved © Alcatel-Lucent 2007VF UK EDN RFI Presentation| September 2007
De-queuing-Egress
Choice between 3 Algorithms Strict Priority
Starting w/ highest priority first, Queues are serviced until empty
Weighted Round Robin (packet based) Each queue to indicate how many packet to be serviced per interval Weight configurable 0-15
– Value of 0 to indicate the queue is to be considered Strict Priority
Deficit Round Robin (bandwidth based) Each queue to indicate how many chunk (10KB) to be serviced per time
interval Weight configurable 0-15
– Value of 0 to indicate the queue is to be considered Strict Priority
All Rights Reserved © Alcatel-Lucent 2007VF UK EDN RFI Presentation| September 2007
QOS LOG - have I got it right?
policy rule
Configures a policy rule on the switch. A rule is made up of a condition (for classifying incoming traffic)
and an action (to be applied to outgoing traffic).
policy rule rule_name [enable | disable] [precedence precedence] [condition condition] [action action]
[validity period name | no vlaidity period] [save] [log [interval seconds]] [count {packets | bytes}]
[trap | no trap]
All Rights Reserved © Alcatel-Lucent 2007VF UK EDN RFI Presentation| September 2007
QOS-CLI
All Rights Reserved © Alcatel-Lucent 2007VF UK EDN RFI Presentation| September 2007
Upcoming QOS enhancements
Auto-Qos on NMS traffic - Auto NMS prioritizes NMS traffic to the switch and aims to alleviate access problems to the switch under DOS attacks. NMS traffic is identified as SSH(TCP Port 22), Telnet(TCP Port 23), Webview (HTTP Port 80) and SNMP(TCP port 161). Each of the above traffic patterns are switched into different queues to maximize the possibility of making the switch manageable/accessible via at least one method(viz. SSH, Telnet, Webview or SNMP
Auto-Qos on CSBU appliances - By default the switch will trust all traffic detected as originating from CSBU IP phones. Detection is achieved by matching on the MAC address range used by CSBU IP phones. The MAC address range used by the CSBU IP phones are 00-80-9F-54-xx-xx — 00-80-9F-64-xx-xx and 00-80-9F-66-xx-xx — 00-80-9F-6F-xx-xx. Additionally the user can specify up-to 4 MACs or MAC ranges that need to be accorded the same QoS as the CSBU IP phones, by specifying the list in the special MAC group
All Rights Reserved © Alcatel-Lucent 2007VF UK EDN RFI Presentation| September 2007
www.alcatel-lucent.com
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