Introduction Overview
Software Reference for SwitchBlade x3100 Series Switches (Layer Two Switching)
4-166
4.7.1.1 Isolated UFO VLAN Notification
When a UFO VLAN is no longer associated with a functional network facing interface, a management log is
produced. This log contains a list of all isolated UFO VLANs. When a UFO VLAN is no longer isolated, the log
is produced again with the list of the remaining isolated UFO VLANs. This process continues until there are no
more isolated UFO VLANs. Once all UFO VLANs have at least one operational interface, the shelf alarm is
cleared.
Following is an example of the log:
SHLF010 2008-02-11 14:20:40 3541 INFO
Description: No active/standby or dynamic interface in UFO VLAN
VLANs: 5,10-12
4.7.2 Forwarding Mode and Determining Upstream Nodes and Interfaces
In setting up the UFO VLANs on interfaces, there is the FORWARDING parameter that controls how the
interface for the UFO VLAN determines whether it is the upstream interface. This is used in the various pro-
tection schemes where a configuration will reconverge and the UFO interface may need to change its status as
upstream or downstream.
The values for FORWARDING can be divided into two groups:
• Static - The interface for this UFO is always either upstream or downstream.
• Dynamic - The interface uses one of the spanning tree protocols to dynamically determine whether it is
upstream or downstream.
The following table describes these modes.
TABLE 4-21 Forwarding Modes for UFO VLANs
Forwarding Mode Description Notes
PRIMARYUPSTREAM All frames that are received on the other
interfaces will be sent out this interface.
Static (can also be used with UCP)
SECONDARYUPSTREAM All frames that are received on the other
interfaces will be sent out this interface if
there is a fault with the PRIMARYUP-
STREAM.
Refer to Upstream Control Protocol
(UCP).
DOWNSTREAM Only frames that are received over the
UPSTREAM interface may be switched to
the DOWNSTREAM interface.
Static
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