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KS8995MAI Datasheet(PDF) 34 Page - Micrel Semiconductor |
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KS8995MAI Datasheet(HTML) 34 Page - Micrel Semiconductor |
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34 / 79 page  Micrel, Inc. KS8995MA/FQ Semptember 2008 34 M9999-091508 Port Mirroring Support KS8995MA/FQ supports “port mirror” comprehensively as: 1. “Receive Only” mirror on a port. All the packets received on the port will be mirrored on the sniffer port. For example, port 1 is programmed to be “rx sniff,” and port 5 is programmed to be the “sniffer port.” A packet, received on port 1, is destined to port 4 after the internal look-up. The KS8995MA/FQ will forward the packet to both port 4 and port 5. KS8995MA/FQ can optionally forward even “bad” received packets to port 5. 2. “Transmit Only” mirror on a port. All the packets transmitted on the port will be mirrored on the sniffer port. For example, port 1 is programmed to be “tx sniff,” and port 5 is programmed to be the “sniffer port.” A packet, received on any of the ports, is destined to port 1 after the internal look-up. The KS8995MA/FQ will forward the packet to both ports 1 and 5. 3. “Receive and Transmit” mirror on two ports. All the packets received on port A AND transmitted on port B will be mirrored on the sniffer port. To turn on the “AND” feature, set Register 5 bit 0 to 1. For example, port 1 is programmed to be “rx sniff,” port 2 is programmed to be “transmit sniff,” and port 5 is programmed to be the “sniffer port.” A packet, received on port 1, is destined to port 4 after the internal look-up. The KS8995MA/FQ will forward the packet to port 4 only, since it does not meet the “AND” condition. A packet, received on port 1, is destined to port 2 after the internal look-up. The KS8995MA/FQ will forward the packet to both port 2 and port 5. Multiple ports can be selected to be “rx sniffed” or “tx sniffed.” And any port can be selected to be the “sniffer port.” All these per port features can be selected through Register 17. VLAN Support KS8995MA/FQ supports 16 active VLANs out of 4096 possible VLANs specified in IEEE 802.1q. KS8995MA/FQ provides a 16-entry VLAN table, which converts VID (12 bits) to FID (4 bits) for address look-up. If a non-tagged or null-VID-tagged packet is received, the ingress port VID is used for look-up. In the VLAN mode, the look-up process starts with VLAN table look-up to determine whether the VID is valid. If the VID is not valid, the packet will be dropped and its address will not be learned. If the VID is valid, FID is retrieved for further look-up. FID+DA is used to determine the destination port. FID+SA is used for learning purposes. DA found in Static MAC table USE FID Flag? FID Match? DA+FID found in Dynamic MAC table Action No Don’t care Don’t care No Broadcast to the membership ports defined in the VLAN table bit [20:16]. No Don’t care Don’t care Yes Send to the destination port defined in the dynamic MAC table bit [54:52]. Yes 0 Don’t care Don’t care Send to the destination port(s) defined in the static MAC table bit [52:48]. Yes 1 No No Broadcast to the membership ports defined in the VLAN table bit [20:16]. Yes 1 No Yes Send to the destination port defined in the dynamic MAC table bit [54:52]. Yes 1 Yes Don’t care Send to the destination port(s) defined in the static MAC table bit [52:48]. Table 7. FID+DA Look-Up in the VLAN Mode |
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