SRP v2 CAM

SAA/ SA

Reject NE SAM DAH Reserved Bit

63 32 31

▼]_*_ IK

Mac Addr

1

1

Byte Counter Packet Counter

63 32 31

Byte Counter Packet Counter

Source Counters

2048

Status Bits Source Address Pool

0921_04F9_c3 © 1999, Cisco Systems, Inc.

• SRP provides direct support for IP multicast

• IP multicast uses class D address space

• The class D multicast address is mapped to the appropriate 48 bit MAC address for transport on the ring

0921 _04F9_c3 © 1999, Cisco Systems, Inc. *W ^ , k-"r>m 37

Multicast

7

6

5

4

3

2

1

0

Byte 1

0

0

0

0

0

0

0

1

Byte 2

0

0

0

0

0

0

0

0

Byte 3

0

1

0

1

1

1

1

0

Byte 4

0

0

0

0

0

0

1

0

Byte 5

1

0

1

0

1

1

1

1

Byte 6

1

1

1

0

1

1

0

1

Multicast Bit 00:00:5E

224.2.175.237

Multicast MAC Address == 01:00:5E:02:AF:ED

0921 04F9 c3

• The source node handles the IP multicast address to MAC address mapping

• Nodes interested in receiving the multicast packet creates an entry for the MAC address in their CAM

0921 04F9 c3

Multicast Handling

• Arriving multicast packets with a matching DA are forward to the host processing module

• Unlike unicast packets multicast packets are source stripped

• The multicast packets are placed into the transit buffer for continued circulation

0921 _04F9_c3 © 1999, Cisco Systems, Inc. ^ ^ ^ V&SC© »COrtl 40

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