HP ProCurve 3500yl Release Notes page 45

Software version k.13.49
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[admin-edge-port]
Enables admin-edge-port for RSTP/MSTP. If a bridge or switch is detected on the
segment, the port automatically operates as non-edge, not enabled. (Default: No
- disabled)
If admin-edge-port is disabled on a port and auto-edge-port has not been disabled,
the auto-edge-port setting controls the behavior of the port.
The no spanning-tree < port-list > admin-edge-port command disables
admin-edge-port operation on the specified ports.
[mcheck]
Forces a port to send RSTP/MSTP BPDUs for 3 seconds. This allows for another
switch connected to the port and running RSTP to establish its connection
quickly and for identifying switches running 802.1D STP. If the whole-switch
force-version parameter is set to stp-compatible, the switch ignores the mcheck
setting and sends 802.1D STP BPDUs out all ports.
[root-guard]
MSTP only. When a port is enabled as root-guard, it cannot be selected as the root
port even if it receives superior STP BPDUs. The port is assigned an "alternate"
port role and enters a blocking state if it receives superior STP BPDUs. The
BPDUs received on a root-guard port are ignored. All other BPDUs are accepted
and the external devices may belong to the spanning tree as long as they do not
claim to be the Root device. (Default: No - disabled)
Note: In standard Spanning Tree Protocol operation, the calculation of active
network topologies may be an issue when switches outside the core region of a
network are under shared or limited administrative control. Such a switch may
become a Root Bridge for the entire network and create non-optimal forwarding
paths. By enabling the root-guard feature on ports that face outside the core
network, external boundaries for the core network are created to ensure the Root
Bridge is located within the core network.
[tcn-guard]
When tcn-guard is enabled for a port, it causes the port to stop propagating
received topology change notifications and topology changes to other ports.
(Default: No - disabled)
Enhancements
Release K.12.04 Enhancements
34

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