Series AFS8202M
Alba Fiber Systems Inc. Specifications are subject to change without notice.
Page 48 6/20/14
www.albafiber.net
Industrial Redundant Managed Ethernet Media Converter with 2 Ports
1 x 10/100/1000BaseT(X) Port, 1 x 1000M SFP Port
◇
Range: 0-240, in steps of 16
◇
Options: 0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240
■
Forward Delay – The delay used by STP Bridges to transit Root and Designated Ports to
Forwarding (used in STP compatible mode). Valid values are in the range 4 to 30 seconds.
■
Max Age – Maximum age of the information transmitted by the Bridge when it is the Root
Bridge. Valid values are in the range 6 to 40 seconds, and MaxAge must be <= (FwdDelay-1)*2.
■
Transmit Hold Count – The number of BPDU's a bridge port can send per second. When
exceeded, transmission of the next BPDU will be delayed. (Range: 1-10; Default: 6)
■
Max Hop Count– The maximum number of hops allowed in the MST region before a BPDU is
discarded. (Range: 6-40; Default: 20) An MST region is treated as a single node by the STP and
RSTP protocols. Therefore, the message age for BPDUs inside an MST region is never changed.
However, each spanning tree instance within a region and the common internal spanning tree
(CIST) that connects these instances use a hop count to specify the maximum number of
bridges that will propagate a BPDU. Each bridge decrements the hop counts by one before
passing on the BPDU. When the hop count reaches zero, the message is dropped.
Advanced Settings
■
Edge Port BPDU Filtering
–
BPDU filtering allows you to avoid transmitting BPDUs on
configured edge ports that are connected to end nodes. By default, STA sends BPDUs to all
ports regardless of whether administrative edge is enabled on a port. BDPU filtering is
configured on a per-port basis. (Default: Disabled)
■
Edge Port BPDU Guard
–
This feature protects edge ports from receiving BPDUs. It prevents
loops by shutting down an edge port when a BPDU is received instead of putting it into the
spanning tree discarding state. In a valid configuration, configured edge ports should not
receive BPDUs. If an edge port receives a BPDU, an invalid configuration exists, such as a
connection to an unauthorized device.
■
The BPDU guard feature provides a secure response to invalid configurations because an
administrator must manually enable the port. (Default: Disabled)
■
Port Error Recovery
–
Controls whether a port in the error-disabled state will be automatically
enabled after a certain time. If recovery is not enabled, ports have to be disabled and re-
enabled for normal STA operation. The condition is also cleared by a system reboot.
■
Port Error Recovery Timeout
–
The time that has to pass before a port in the error-disabled
state can be enabled. (Range: 30-86400 seconds or 24 hours)
WEBINTERFACE
To configure global settings for STA:
1. Click Spanning Tree >> Bridge Status >> Edit.
2. Modify the required attributes.
3. Click Save.
