Cabletron Systems 6H122-16 manual Port Redirect Function, Auto-Negotiation, Broadcast Suppression

Chapter 1: Introduction

1.3.9Port Redirect Function

The port redirect function, also referred to as “Port Mirroring,” is a troubleshooting tool used to map traffic from a single source port or multiple source ports to a destination port(s) within the chassis. This feature functions at the bit level, which allows all packets, including those with errors, to be copied and sent to an analyzer or RMON probe. The analyzer or RMON probe will see the data as if it is directly connected to the LAN segment of the source port(s).

1.3.10 Auto-Negotiation

Twisted pair ports on the 6H122-16 module have the ability to auto-negotiate the type of connection required to provide a link to another device. During Auto-Negotiation, two devices automatically exchange information “telling” each other what their operating capabilities are. The Auto-Negotiation feature targets the maximum capabilities that can be reached between the two devices. For example, the 6H122-16 adjusts to 100 Mbps when the device on the other end of the connection can also adjust between 10 Mbps or 100 Mbps. If the device on the other end of the connection can only operate at 10 Mbps, then the 6H122-16 adjusts to 10 Mbps operation.

When Auto-Negotiation is supported at both ends of a link, the two devices dynamically adjust to full or half duplex operation based on the maximum capability that can be reached between the two devices. If the device connected to the 6H122-16 cannot auto-negotiate, the 6H122-16 interface operates according to the capabilities of the other device.

NOTE

All ports support standard Ethernet, standard full duplex operation, and Fast Ethernet. Ports 1 through 14 do not support Fast Ethernet in full duplex operation. However, ports 15 and 16 do support full duplex Fast Ethernet.

1.3.11 Broadcast Suppression

Broadcast Suppression allows a limit to be set on the number of receive broadcast frames per port/per second to be forwarded out the other ports on the module. Any broadcast frames above the specified limit are dropped. In the event that broadcast frames are being suppressed, multicast and unicast frames continue to be switched.

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