Avaya 555-245-600 Manual Do Utilizador
DiffServ
Issue 6 January 2008
321
Recommendations for end-to-end QoS
, a Layer 3 CoS method.
Modern routers can map DiffServ Code Points (DSCP) to 802.1p priority values, so 802.1p tags
can be recreated on each Ethernet link. This functionality is supported in Avaya Layer 3
switches, and the X330 WAN module.
IEEE 802.1p states a standard according to which these bits are used for CoS. The precedence
is listed in
can be recreated on each Ethernet link. This functionality is supported in Avaya Layer 3
switches, and the X330 WAN module.
IEEE 802.1p states a standard according to which these bits are used for CoS. The precedence
is listed in
DiffServ
The Differentiated Services (DiffServ) prioritization scheme redefines the existing TOS byte in
the IP header (
the IP header (
combining the first 6 bits into 64 possible combinations. This use of the TOS byte is still
evolving, but can be used now by Communication Manager, IP Telephones, and other network
elements such as routers and switches in the LAN and WAN.
evolving, but can be used now by Communication Manager, IP Telephones, and other network
elements such as routers and switches in the LAN and WAN.
Table 54: IEEE 802.1 precedence and service mapping
User priority
Service mapping
000
Default, assumed to be best effort
001
Reserved, less than best effort
010
Reserved
011
Reserved
100
Delay sensitive, no bound
101
Delay sensitive, 100 ms bound
110
Delay sensitive, 10 ms bound
111
Network control