16. Ethernet Ports
ROX™ v2.2 User Guide
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RuggedBackbone™ RX5000
Default: broadcast
This parameter specifies the types of frames to rate-limit on this port. It applies only to received
frames:
• BROADCAST : only broadcast frames will be limited.
• MULTICAST : all multicast frames (including broadcast) will be limited.
• MCAST-FLOOD-UCAST : all multicast frames (including broadcast) will be limited. Unicast will
not be limited.
• ALL : all frames (both multicast and unicast) will be limited.
Egress Limit
Synopsis: string - the keyword { disabled }
Synopsis: integer
Default: disabled
The maximum data rate in kbps at which the switch will transmit (multicast, broadcast and unicast)
frames on this port. The switch will discard frames in order to meet this rate if required. The valid
range is 62 to 256000 Kbps. If not set, this feature is disabled.
16.2.3. Port Mirroring
Port mirroring is a troubleshooting tool that copies, or mirrors, all traffic received or transmitted on a
designated port to another mirror port. If a protocol analyzer were attached to the target port, the traffic
stream of valid frames on any source port is made available for analysis.
Select a target port that has a higher speed than the source port. Mirroring a 100 Mbps port onto a 10
Mbps port may result in an improperly mirrored stream.
Frames will be dropped if the full-duplex rate of frames on the source port exceeds the transmission
speed of the target port. Since both transmitted and received frames on the source port are mirrored
to the target port, frames will be discarded if the sum traffic exceeds the target port’s transmission rate.
This problem reaches its extreme in the case where traffic on a 100 Mbps full-duplex port is mirrored
onto a 10 Mbps half-duplex port.
Invalid frames received on the source port will not be mirrored. These include CRC errors,
oversize and undersize packets, fragments, jabbers, collisions, late collisions and dropped
events).
16.2.3.1. Port Mirroring Limitations
• Traffic will be mirrored onto the target port only if the target port is a member of the same VLANs
as the source port.
• The target port may sometimes incorrectly show the VLAN tagged/untagged format of the mirrored
frames.
• Network management frames (such as RSTP, GVRP etc. ) may not be mirrored.
• Switch management frames generated by the switch (such as Telnet, HTTP, SNMP etc.) may not
be mirrored.
