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參數(shù)資料
| 型號： | MVTX2602AG |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | Managed 24 Port 10/100 Mbps Ethernet Switch |
| 中文描述： | DATACOM, LAN SWITCHING CIRCUIT, PBGA553 |
| 封裝： | 37.50 X 37.50 MM, 2.33 MM HEIGHT, MS-034, HSBGA-553 |
| 文件頁數(shù)： | 38/147頁 |
| 文件大?。?/td> | 924K |
| 代理商： | MVTX2602AG |
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MVTX2602
Data Sheet
38
Zarlink Semiconductor Inc.
only one queue at the destination, the queue of lowest priority. What this means is that if flow control is enabled for
a given source port then we can guarantee that no packets originating from that port will be lost, but at the possible
expense of minimum bandwidth or maximum delay assurances. In addition, these "downgraded" frames may only
use the shared pool or the per-source reserved pool in the FDB; frames from flow control enabled sources may not
use reserved FDB slots for the highest six classes (P2-P7).
The MVTX2602 does provide a system-wide option of permitting normal QoS scheduling (and buffer use) for
frames originating from flow control enabled ports. When this programmable option is active, it is possible that
some packets may be dropped, even though flow control is on. The reason is that intelligent packet dropping is a
major component of the MVTX2602’s approach to ensuring bounded delay and minimum bandwidth for high priority
flows.
7.8.3 Unicast Flow Control
For unicast frames, flow control is triggered by source port resource availability. Recall that the MVTX2602’s buffer
management scheme allocates a reserved number of FDB slots for each source port. If a programmed number of a
source port’s reserved FDB slots have been used, then flow control Xoff is triggered.
Xon is triggered when a port is currently being flow controlled, and all of that port’s reserved FDB slots have been
released.
Note that the MVTX2602’s per-source-port FDB reservations assure that a source port that sends a single frame to
a congested destination will not be flow controlled.
7.8.4 Multicast Flow Control
In unmanaged mode, flow control for multicast frames is triggered by a global buffer counter. When the system
exceeds a programmable threshold of multicast packets, Xoff is triggered. Xon is triggered when the system returns
below this threshold.
In managed mode, per-VLAN flow control is used for multicast frames. In this case, flow control is triggered by
congestion at the destination. How so The MVTX2602 checks each destination to which a multicast packet is
headed. For each destination port the occupancy of the lowest-priority transmission multicast queue (measured in
number of frames) is compared against a programmable congestion threshold. If congestion is detected at even
one of the packet’s destinations then Xoff is triggered.
In addition, each source port has a 26-bit port map recording which port or ports of the multicast frame’s fanout
were congested at the time Xoff was triggered. All ports are continuously monitored for congestion and a port is
identified as uncongested when its queue occupancy falls below a fixed threshold. When all those ports that were
originally marked as congested in the port map have become uncongested, then Xon is triggered and the 26-bit
vector is reset to zero.
The MVTX2602 also provides the option of disabling VLAN multicast flow control.
Note
:
If per-Port flow control is on, QoS performance will be affected.
7.9 Mapping to IETF Diffserv Classes
For 10/100 Mbps ports, the classes of Table 8 are merged in pairs—one class corresponding to NM+EF, two AF
classes, and a single BE class.
VTX
P3
P2
P1
P0
IETF
NM+EF
AF0
AF1
BE0
Table 8 - Mapping between MVTX2602 and IETF Diffserv Classes for 10/100 Ports
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MVTX2603 | Unmanaged 24-Port 10/100 Mb + 2-Port 1 Gb Ethernet Switch |
| MVTX2603AG | Unmanaged 24-Port 10/100 Mb + 2-Port 1 Gb Ethernet Switch |
| MVTX2604 | Managed 24-Port 10/100 Mb + 2 Port 1 Gb Ethernet Switch |
| MVTX2604AG | Managed 24-Port 10/100 Mb + 2 Port 1 Gb Ethernet Switch |
| MVTX2801 | Unmanaged 4-Port 1000 Mbps Ethernet Switch |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MVTX2602AG2 | 制造商:Microsemi Corporation 功能描述: |
| MVTX2603 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Unmanaged 24-Port 10/100 Mb + 2-Port 1 Gb Ethernet Switch |
| MVTX2603A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Unmanaged 24 port 10/100Mb + 2 port 1Gb Ethernet switch |
| MVTX2603AG | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Unmanaged 24-Port 10/100 Mb + 2-Port 1 Gb Ethernet Switch |
| MVTX2603AG2 | 制造商:Microsemi Corporation 功能描述: |
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