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參數(shù)資料
| 型號： | AX88658AB |
| 廠商： | ASIX Electronics Corporation |
| 英文描述： | 8-Port 10/100/1000BASE-T Ethernet Switch |
| 中文描述： | 8端口10/100/1000BASE-T以太網(wǎng)交換機(jī) |
| 文件頁數(shù)： | 14/36頁 |
| 文件大?。?/td> | 343K |
| 代理商： | AX88658AB |
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AX88658A provides 4 Port-Pairs for bandwidth management. Users can assign any two ports as one Port-Pair with
internal registers basically. Any packets will put the high priority queue of the Port-Pair when send the packets each
other. That is, two ports of each Port-Pair will obtain more bandwidth than other ports when congestion.
In addition, one port can be as the highest priority port if one All_Bit of a Port-Pair is active. That is, user can assign
format of the Port-Pair as OnePort-to-All and every packets of the OnePort will put in the high priority transmit queue of
other ports..
3.8 VLAN and Broadcast Storming Prevention
AX88658A
supports 8 port-based VLAN groups to ease the administration of logical groups of stations that can
communicate as if they were on the same LAN, and move, add or change numbers of these groups. The scheme can
prevent effectively the broadcast storming from interfering with the whole transmission performance between ports.
During this time, the ports belonging to different groups are independent. Only the destination port of broadcast packets
in the same group will be allowed. Furthermore, the scheme of the VLAN group dividing is very flexible. The
overlapped port-groups are allowed during some operations, for example, one port can be shared by two groups, and all
the other operations between these two groups remain independent except for the overlapped port. Only the overlapped
port could use the same destination MAC address for two different VLAN port-groups.
The
AX88658A
can enable broadcast storm filtering control by MaxStorm[1:0]. This allows limitation of the
number of broadcast packets into the switch, and can be implemented on a per port basis. The threshold of
number of broadcast packets is set to 64/32/16. When enabled (i.e., MaxStorm[1:0] is not 2’b00), each port
will drop broadcast packets (Destination MAC ID is ff ff ff ff ff ff) after receiving 64 continuous broadcast
packets. The counter will be reset to 0 when timer is up or when receiving any non-broadcast packets
(Destination MAC ID is not ff ff ff ff ff ff).
When disabled (i.e., MaxStorm[1:0] is 2’b00), or the number of non-unicast packets received at the port is not
over the programmed threshold, the switch will forward the packet to all the ports (except the receiving port)
within the VLANs specified at the receiving port.
If Broadcast-Storm-drop is enabled, the AX88658AB will only drop broadcast packets but not the multicast
packets.
3.9 Security Operation - Port SA restriction
AX88658A
provides source MAC address security support. When OneSaSecurityMode is turned on, then the port(s) will
be fixed in the secured SA and stop learning. The port(s) will forward packets with the matched SA. If any other ports
receive the packet with this secures SA, this packet will be discarded. Learns a source MAC address again if
UpdateSaForSecurity is turned on.
3.10 Ingress/Egress Bandwidth Control Scheme
The bandwidth control will set the maximum bandwidth that each port can support. Basically AX88658A
provides 256
bandwidth classes of 1000 Mbps with thresholds (ResolutionIngress and ResolutionEngress). In half-duplex mode, the
receiving side (ingress) will drop packets or send JAM with IgressMode if it is over the bandwidth threshold. On the
transmitting side (egress), if it goes over the threshold, it will stop transmitting until time is up, then transmit data again.
Under full-duplex mode, if the transmitting data meet the bandwidth threshold, the bandwidth control scheme will send
the drop packets or 802.3x PAUSE frame. When it expires, it will send the release packet. For the receiving side without
flow control (802.3x), it will drop the packet if it goes over the threshold.
3.11 Port Mirroring
Port mirroring is a function that mirrors or duplicates traffic from one “target port” to a “mirror port”. The mirror or target
port mirroring can be set up for each port individually to mirror either incoming packets or outgoing packets. Incoming
and outgoing traffic need not be mirrored to the same port. Unidirectional traffic on a port can only be mirrored to one
mirror port. Only correct packets that would normally be handled by the AX88658A
will be mirrored. Packets with CRC
errors and collision fragments etc are
not
mirrored.
- Input mirroring:
Traffic received on a port will be sent to the mirror port as well as to any other addressed port.
- Output mirroring:
Traffic sent out on a port will also be sent to the mirror port.
ASIX ELECTRONICS CORPORATION
14
AX88658AB 8-Port 10/100/1000BASE-T Ethernet Switch
CONFIDENTIAL
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