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參數(shù)資料
| 型號(hào)： | MDS213 |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | 12-Port 10/100Mbps + 1Gbps Ethernet Switch |
| 中文描述： | 12口10/100Mbps千兆以太網(wǎng)交換機(jī) |
| 文件頁(yè)數(shù)： | 58/120頁(yè) |
| 文件大?。?/td> | 1678K |
| 代理商： | MDS213 |
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MDS213
Data Sheet
58
Zarlink Semiconductor Inc.
dynamic multicast group entries between switches and multicast clients and servers. RFC 1112 specifies the
protocols and behaviour for IP Multicasting.
The MDS213 supports up to 255 IP Multicast Groups and treats them as extensions of the VLAN operation. No
additional hardware is needed, since the IGMP operates on the hardware already provided for VLAN functionality.
IGMP packets are identified by the Search Engine and are passed to the external CPU for processing, when the
destination MAC address is 01-00-5E-xx-xx-xx, Protocol field value equals 2 and the destination IP address is
224.0.0.x. The external CPU then instructs the HISC to setup IP Multicast entries for the MAC Addresses in the
Switch Database Memory, the VLAN Table, and the MCT-VLAN Table. The HISC builds and maintains an MCT-
VLAN and a VLAN Table for IP Multicast Groups in the Frame Buffer Memory.
When an IP Multicast packet is received, it is identified by a specific class of Multicast Destination MAC addresses,
where the high-order bits indicate use of IGMP, and the low-order bits indicate the specific IGMP Group Identifier.
The MDS213 searches the MCT VLAN Association Table for destination MAC addresses, using the IGMP or the
IGMP Group Identifier stored in the MCT, to obtain port membership for the IP Multicast Group. The Search Engine
forwards the packet to each port associated with the IP Multicast Group. Where no address is found, the HISC
firmware updates the MCT-VLAN to include this address.
The Multicast Buffer Control Register (MBCR) allows the configuration of multicast frames to be forwarded, the
number of buffers reserved for receiving remote multicast frames, the number of multicast frames allowed, and the
multicast forwarding threshold.
15.2 IGMP and IP Multicast Filtering
IP multicast filtering optimizes switched network performance by limiting multicast packets to only be forwarded to
ports containing multicast group membership instead of flooding all ports in a subnet (VLAN).
The Internet Group Management Protocol (IGMP) runs between hosts and their immediate neighboring multicast
routers. The mechanism of the protocol allows a host to inform its local router that it wishes to receive transmissions
addressed to a specific multicast group. Routers, also, periodically query the LAN to determine if known group
members are still active.
Based on the group membership information, learned from the IGMP, a router is able to determine which (if any)
multicast traffic needs to be forwarded to each of its "leaf" sub-network. Multicast routers use this information, in
conjunction with a multicast routing protocol, to support IP multicasting across the Internet.
The MDS213 based switch supports IP Multicast Filtering by passively snooping on the IGMP Query. The IGMP
Report packets are transferred between IP Multicast Routers and IP Multicast host groups to learn the IP Multicast
group members within each VLAN actively sending out IGMP Query messages soliciting IP Multicast group
members. They thus learn the location of multicast routers and member hosts in multicast groups within each
VLAN.
Since IGMP is not concerned with the delivery of IP multicast packets across sub-networks, an external IP multicast
router will be needed if the IP multicast packets have to be routed across different IP sub-networks.
15.3 Implementation in MDS213
The MDS213 supports up to 255 IP Multicast Groups and treats them as an extension of the VLAN operation. No
additional hardware is needed, since IP Multicast Switching/Filtering already operates in hardware provided for
VLAN functionality.
IGMP packets are identified by the Search Engine and are passed to the external CPU for processing, when the
destination MAC address is 01-00-5E-xx-xx-xx, Protocol field value equals 2 and the destination IP address is
224.0.0.x. The external CPU then instructs the HISC to setup an MCT entry for this IP Multicast Address in the
Switch Database Memory. If this is a new IP Multicast group, it sets up an entry in the VLAN Port Mapping Table by
itself.
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相關(guān)代理商/技術(shù)參數(shù) |
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| MDS213CG | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:12-Port 10/100Mbps + 1Gbps Ethernet Switch |
| MDS217 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| MDS-21E09 | 制造商:ITT Interconnect Solutions 功能描述:BACKSHELL - Bulk |
| MDS21P-6AA-000 | 制造商:Amphenol Corporation 功能描述:MICRO D/18in WIRE 26AWG 7 STRD THRU HOLE |
| MDS21P-6BF-000 | 制造商:Amphenol Corporation 功能描述:MICRO D/36in WIRE 26AWG 7 STRD FLOT |
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