EASY 6996M CPU Infineon Technologies, EASY 6996M CPU Datasheet - Page 53

• Manufacturer Part Number: EASY 6996M CPU
• Description: BOARD EVAL W/CPU ADM6996M
• Manufacturer: Infineon Technologies
• Series: Samurair

Specifications of EASY 6996M CPU

• Main Purpose: Interface, Ethernet
• Embedded: No
• Utilized Ic / Part: ADM6996M
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Primary Attributes: -
• Other names: EASY6996MCPUIN

Table 30
Busy
Status 5[15]
3.1.17.3
IGMP snooping is a feature that allows the switch to “listen in” on the IGMP conversation between hosts and
routers. When a switch hears an IGMP report from a host for a given multicast group, the switch adds the host's
port number to the GDA (Group Destination Addresses) list for that group. And, when the switch hears an IGMP
leave, it removes the host's port from the Multicast table entry.
Multicast Address
1. Multicast IP addresses are Class D IP addresses. Therefore, all IP addresses from 224.0.0.0 to
239.255.255.255 are multicast IP addresses. They are also referred to as Group Destination Addresses (GDA).
2. For each GDA there is an associated MAC address. This MAC address is formed by 01-00-5e, followed by the
last 23 bits of the GDA translated in hex. Therefore:
•
•
•
•
3. Some Multicast IP addresses are reserved for special use. For example:
•
•
•
In general, addresses from 224.0.0.1 to 224.0.0.255 are reserved and used by various protocols.
IGMP
IGMP is a standard defined in RFC1112 for IGMPv1 and in RFC2236 for IGMPv2. It specifies how a host can
register a router to receive specific multicast traffic.
IGMPv1
•
Table 31
DA
01005e000001
Unused
(Len*4-20) bytes
•
Data Sheet
Consequently, this is not a one-to-one mapping, but a one-to-many mapping:
230.20.20.20 corresponds to MAC 01-00-5e-14-14-14
224.10.10.10 corresponds to MAC 01-00-5e-0a-0a-0a
224.10.10.10 corresponds to MAC 01-00-5e-0a-0a-0a
226.10.10.10 corresponds to MAC 01-00-5e-0a-0a-0a, as well
224.0.0.1 - All multicast-capable hosts.
224.0.0.2 - All multicast-capable routers
224.0.0.5 and 224.0.0.6 is used by: Open Shortest Path First (OSPF).
Membership Query are issued by router at regular intervals to check whether there is still a host interested in
the GDA in that segment.
Membership Report is issued by hosts that want to receive a specific multicast group (GDA). Host
membership reports are issued either unsolicited (when the host wants to receive GDA traffic first) or in
response to a membership query.
Entry Format of IGMP Membership Table
IGMP Snooping Introduction
IPV4/IGMP/General Query
Result
Status 5[14:12]
SA
6 bytes
TP
8’h11
Type
16’h0800
Unused
3 bytes
Entry Address
Status 4[4:0]
Ver
4’h4
GA
32’b0
Len
4 bits
53
Entry Data
{Status 3[9:0], Status 2, Status 1, Status 0}
TOS
1 byte
Unused
7 bytes
Protocol
8’h02
Revision 1.4, 2006-03-24
Function Description
Unused
6 bytes
Samurai-6M/MX
ADM6996M/MX
DIP
224.0.0.1