Mapping Ethernet CoS to ATM QoS

The ability to set CoS priorities for Ethernet LAN traffic is becoming more important every day. The IEEE's 802.1p and the IETF's IP ToS standards represent powerful tools for network managers setting CoS priorities. The 802.1p specification calls for 3 priority bits in the Ethernet frame...

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Bibliographic Details
Published in:Network world 1999-06, Vol.16 (25), p.53-53
Main Author: Cullen, Tim Hale And Cam
Format: Magazinearticle
Language:English
Subjects:
Asynchronous communications
Asynchronous transfer mode
ATM
ATM adapter
ATM adapters
Computer network equipment industry
Ethernet
Ethernet adapter
FDDI adapter
Frame relay adapter
LAN adapters
LAN/WAN adapter
Mapping
Network adapters
Network hardware industry
Network switching
Packet switch
Packet switches
Product information
Software
Specifications
Standardization
Token Ring adapter
Wireless LAN/WAN adapter
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Summary:The ability to set CoS priorities for Ethernet LAN traffic is becoming more important every day. The IEEE's 802.1p and the IETF's IP ToS standards represent powerful tools for network managers setting CoS priorities. The 802.1p specification calls for 3 priority bits in the Ethernet frame header. These bits can be set for any of 8 priorities, and then read by LAN switches at Layer 2. The IP ToS specification works in a similar way but is implemented at Layer 3. With either CoS type, priorities may be set at the user desktop, according to corporate policy, through application or other intelligent software; or priorities may be set at switches in the LAN. With CoS to QoS mapping, net executives can extend the benefits of ATM QoS into their Internet LANs. Currently, the ATM virtual circuit likely to be used for CoS-to-QoS mapping in a permanent virtual circuit.
ISSN:0887-7661