Zyxel XGS-4728F [353/491] Dscp and per hop behavior
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Zyxel XGS-4728F [353/491] Dscp and per hop behavior

Zyxel XGS-4728F [353/491] Dscp and per hop behavior
XGS-4526/4528F/4728F User’s Guide
353
CHAPTER 40
Differentiated Services
This chapter shows you how to configure Differentiated Services (DiffServ) on the
Switch.
40.1 DiffServ Overview
Quality of Service (QoS) is used to prioritize source-to-destination traffic flows. All
packets in the flow are given the same priority. You can use CoS (class of service)
to give different priorities to different packet types.
DiffServ is a class of service (CoS) model that marks packets so that they receive
specific per-hop treatment at DiffServ-compliant network devices along the route
based on the application types and traffic flow. Packets are marked with DiffServ
Code Points (DSCPs) indicating the level of service desired. This allows the
intermediary DiffServ-compliant network devices to handle the packets differently
depending on the code points without the need to negotiate paths or remember
state information for every flow. In addition, applications do not have to request a
particular service or give advanced notice of where the traffic is going.
40.1.1 DSCP and Per-Hop Behavior
DiffServ defines a new DS (Differentiated Services) field to replace the Type of
Service (ToS) field in the IP header. The DS field contains a 6-bit DSCP field which
can define up to 64 service levels and the remaining 2 bits are defined as currently
unused (CU). The following figure illustrates the DS field.
Figure 178 DiffServ: Differentiated Service Field
DSCP is backward compatible with the three precedence bits in the ToS octet so
that non-DiffServ compliant, ToS-enabled network device will not conflict with the
DSCP mapping.
The DSCP value determines the PHB (Per-Hop Behavior), that each packet gets as
it is forwarded across the DiffServ network. Based on the marking rule different
DSCP (6 bits) CU (2 bits)

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Здравствуйте! Свич Zyxel XGS-4728F в консоле видает : Bootbase Version: V1.00 | 10/22/2007 12:48:50RAM:Size = 128 MbytesDRAM POST: Testing:131072K OKDRAM Test SUCCESS !FLASH: Intel 64MCopyright (c) 1994 - 2011 ZyXEL Communications Corp.Data abort occuredFault Status = 0x000000F5Fault Addr = 0xE59FF570Current Task TCB = 0x0129ED10Current Task Name = PINICurrent Task Stack Start = 0x0129EDACCurrent Task Stack End = 0x012A5E2BAbnormal Stack Task List : NONE r0= 0x000000F5 r1= 0xE59FF570 r2= 0xE59FF018 r3= 0xE59FF000 r4= 0x00D135FC r5= 0xE59FF018 r6= 0x00D135FC r7= 0x00067FC0 r8= 0x00D135FC r9= 0x00000000 r10=0x00000004 fp= 0x012A5CD4 r12=0x00000000 sp= 0x012A5C14 lr= 0x00000564 pc= 0x0011DC40 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 12a5cc8: 01 2a 5d 08 01 2a 5c d8 00 11 e8 6c 00 11 d9 d8 .*]..*\.l. 12a5cd8: 00 00 00 00 00 00 00 00 01 1b 13 74 01 2a 5d 08 .t.*]. 12a5ce8: 00 d1 44 f8 00 cf a2 10 00 cf a3 38 00 00 00 00 ..D.8. 12a5cf8: 00 00 00 00 01 2a 5d 7c 01 2a 5d 0c 00 12 06 80 .*]|.*]. 12a5d08: 00 11 e7 90 00 08 c6 d4 00 65 7d 34 00 fe 12 b0 .e}4. 12a5d18: 01 2a 5d 34 01 2a 5d 28 00 09 b8 c4 00 08 c6 c8 .*]4.*]. 12a5d28: 01 2a 5d 4c 01 2a 5d 38 00 17 c9 3c 00 09 b8 c0 .*]L.*]8.<. 12a5d38: 00 fe 12 b0 00 00 00 00 01 2a 5d 64 01 2a 5d 50 .*]d.*]P 12a5d48: 00 17 c9 b8 00 09 bb e8 00 ae c1 58 00 ae c2 28 .X( 12a5d58: 01 2a 5d 7c 01 2a 5d 68 01 2a 5d 7c 00 d0 7b 44 .*]|.*]h.*]|..{D 12a5d68: 00 d0 7b 44 00 cf a2 10 01 2a 5e 10 01 2a 5d 80 ..{D.*^..*]. 12a5d78: 00 06 ff b8 00 12 06 5c 00 00 01 2c 23 f1 97 40 .\.,#..@ 12a5d88: 00 0e 68 c0 00 00 00 00 ef ef ef ef ef ef ef ef ..h. 12a5d98: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a5da8: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a5db8: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a5dc8: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a5dd8: ef ef ef ef ef ef ef ef 00 00 00 01 00 00 00 53 .S 12a5de8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 . 12a5df8: 00 00 00 00 00 00 00 00 00 00 00 00 01 2a 5e 20 .*^ 12a5e08: 01 2a 5e 14 00 65 80 4c 00 06 fd d4 00 00 00 00 .*^..e.L. 12a5e18: 01 2a 5e 24 00 00 00 00 00 65 80 2c 00 00 00 00 .*^$.e.,. 12a5e28: ef ef ef ef 00 00 00 00 00 00 00 00 00 00 00 00 . 12a5e38: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 . 12a5e48: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 . 12a5e58: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 . 12a5e68: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 . 12a5e78: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 . 12a5e88: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 . 12a5e98: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 . 12a5ea8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 . 12a5eb8: 00 00 00 00 00 00 00 00 00 00 00 00 54 48 52 44 .THRD 12a5ec8: 00 00 00 01 01 2a 7e a0 01 2a 5f 60 01 2a 7f 5f .*~..*_`.*._ 12a5ed8: 00 00 20 00 00 00 00 00 00 00 00 00 01 2a 5e c4 .. .*^. 12a5ee8: 01 2a 5e c4 00 93 0c 50 00 00 00 04 00 00 00 03 .*^.P. 12a5ef8: 00 00 00 00 00 00 00 00 00 00 00 04 00 00 00 10 . 12a5f08: 00 00 00 00 00 08 d4 4c 01 2a 5e c4 00 00 00 00 .L.*^. 12a5f18: 00 00 00 00 00 65 89 30 01 2a 5e c4 00 00 00 00 .e.0.*^. 12a5f28: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 . 12a5f38: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 . 12a5f48: 00 00 00 00 00 00 00 00 00 00 00 00 01 2a 7f f8 .*.. 12a5f58: 01 29 ed 10 00 00 00 00 ef ef ef ef ef ef ef ef . 12a5f68: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a5f78: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a5f88: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a5f98: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a5fa8: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a5fb8: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a5fc8: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a5fd8: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a5fe8: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a5ff8: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a6008: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a6018: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a6028: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a6038: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a6048: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a6058: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a6068: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a6078: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a6088: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a6098: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a60a8: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a60b8: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef . 12a60c8: ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef ef .Bootbase Version: V1.00 | 10/22/2007 12:48:50RAM:Size = 128 MbytesFLASH: Intel 64M Как устранить проблему? Спасибо.
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