KS8893ML datasheet(40/106 Pages) MICREL

40 / 106 page

Micrel

KS8893M/ML/MI

June 2005

M9999-063005

Port Mirroring Support

KS8893M supports “Port Mirroring” comprehensively as:

“receive only” mirror on a port

All the packets received on the port are mirrored on the sniffer port. For example, port 1 is programmed to

be “receive sniff” and port 3 is programmed to be the “sniffer port”. A packet received on port 1 is destined

to port 2 after the internal lookup. The KS8893M forwards the packet to both port 2 and port 3. The

KS8893M can optionally even forward “bad” received packets to the “sniffer port”.

“transmit only” mirror on a port

All the packets transmitted on the port are mirrored on the sniffer port. For example, port 1 is programmed

to be “transmit sniff” and port 3 is programmed to be the “sniffer port”. A packet received on port 2 is

destined to port 1 after the internal lookup. The KS8893M forwards the packet to both port 1 and port 3.

“receive and transmit” mirror on two ports

All the packets received on port A and transmitted on port B are 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 “receive sniff”, port

2 is programmed to be “transmit sniff”, and port 3 is programmed to be the “sniffer port”. A packet

received on port 1 is destined to port 2 after the internal lookup. The KS8893M forwards the packet to

both port 2 and port 3.

Multiple ports can be selected as “receive sniff” or “transmit sniff”. In addition, any port can be selected as the

“sniffer port”. All these per port features can be selected through registers 17, 33 and 49 for ports 1, 2 and 3,

respectively.

IEEE 802.1Q VLAN Support

The KS8893M supports 16 active VLANs out of the 4096 possible VLANs specified in the IEEE 802.1Q

specification. KS8893M provides a 16-entries VLAN Table, which converts the 12-bits VLAN ID (VID) to the 4-bits

Filter ID (FID) for address lookup. If a non-tagged or null-VID-tagged packet is received, the ingress port default

VID is used for lookup. In VLAN mode, the lookup process starts with VLAN Table lookup to determine whether

the VID is valid. If the VID is not valid, the packet is dropped and its address is not learned. If the VID is valid, the

FID is retrieved for further lookup. The FID + Destination Address (FID+DA) are used to determine the destination

port. The FID + Source Address (FID+SA) are used for address learning.

DA found in

Static MAC

Table?

Use FID flag?

FID match?

DA+FID

found in

Dynamic

MAC Table?

Action

Don’t care

Broadcast to the membership ports

defined in the VLAN Table bits [18:16]

Don’t care

Yes

Send to the destination port defined in the

Dynamic MAC Address Table bits [53:52]

Yes

Don’t care

Send to the destination port(s) defined in

the Static MAC Address Table bits [50:48]

Yes

Broadcast to the membership ports

defined in the VLAN Table bits [18:16]

Yes

Send to the destination port defined in the

Dynamic MAC Address Table bits [53:52]

Yes

Don’t care

Send to the destination port(s) defined in

the Static MAC Address Table bits [50:48]

Table 13. FID+DA Lookup in VLAN Mode

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