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The SmartSwitch 2000 Chassis View
2-50 Managing the Hub
To delete an entry:
1. Click to highlight the entry line in the current active entries list that you wish to
delete.
2. Click on the Delete button to remove the redirect pair you have highlighted
from the current active entries list.
The entry will be deleted from the current active entries list and the traffic from
the source port will not be redirected to the destination port any longer.
Priority Configuration
The SmartSwitch 2000 devices support priority packet forwarding. Priority
packet forwarding lets you designate certain packets to be of higher importance
than others, thereby allowing for the forwarding of these packets before packets
of lower priority. This functionality is essential for time-critical applications Ñ
such as real-time video Ñ on shared networks.
Frame priority is enabled by the ÒtaggingÓ of MAC frames so that they are given a
priority designation when they are forwarded by the SmartSwitch 2000 device Ñ
which is a tag-aware switch (i.e., one that adheres to the IEEE P802.1p and IEEE
P802.1q Draft Standards). Tagging a frame is accomplished by adding a Tag
Header to a frame immediately following its original Destination and Source
MAC address Þelds (and any routing Þelds, if present), and then recomputing the
Frame Check Sequence (FCS) appropriately. On receiving such a frame, a
tag-aware switch will read the priority from the tagged portion of the frame,
remove the Tag Header, recompute the FCS, and then direct it to its appropriate
transmission queue.
There are eight priority levels Ñ indicated 0 through 7Ñ available to designate
user priority. Frames tagged with a 0 represent the lowest priority level (or
normal) trafÞc, and frames tagged with a 7 indicate the highest priority level
trafÞc.
The SmartSwitch 2000 itself supports two transmission queues: one that is for 0 or
normal priority trafÞc (or any non-tagged trafÞc), and a second queue that is
reserved for frames that have been tagged with a priority level of 1 or higher. On
receiving any priority-tagged frames, the SmartSwitch 2000 will forward them
out of the high priority queue before forwarding any frames in the normal
NOTE
The Priority ConÞguration menu option will only appear in the Device menu for
devices that respond to any of SPECTRUM Element ManagerÕs queries to the following
OIDs: ctPriorityExtPortStatus, ctPriorityExtMaxNumMACEntries, or
ctPriorityExtNumPktTypeEntries. If your deviceÕs Þrmware does not respond to these
queries, contact the Cabletron Systems Global Call Center for Þrmware upgrade
information.