Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 2216)

Appendix B: Glossary
Software Reference for x310 Series Switches
B.26 AlliedWare Plus TM Operating System - Version 5.4.4C C613-50046-01 REV A
Storm protection
Storm protection uses QoS mechanisms to classify on traffic likely to cause a packet storm
(broadcast and multicast). With QoS storm protection, several actions are possible when a
storm is detected:
■ You can disable the port physically.
■ You can disable the port logically.
■ You can disable the port for a particular VLAN.
For more information see “Storm Protection” on page 38.26 .
STP
Spanning Tree Protocol. STP is the original bridge protocol defined by IEEE standard
802.1D-1988. It creates a single spanning tree over a network.
For more information see “Spanning Tree Protocol (STP)” on page 18.5 . For a
configuration example see “Configuring STP” on page 18.6 .
STP root guard
Spanning Tree Protocol Root Guard. STP Root Guard designates which devices can assume
the role of
Root bridge in an STP network. This stops an undesirable device from taking
over this role, where it could either compromise network performance or cause a security
weakness.
See the spanning-tree guard root command on page 19.44 .
Subnet address
A subnet portion of an IP address. In a subnetted network, the host portion of an IP
address is split into a subnet portion and a host portion using an address or subnet mask.
Subnet mask
A bit mask used to select bits from an Internet address for subnet addressing. The mask is
32 bits long and selects the network portion of the Internet address and one or more bits
of the local portion. Sometimes called address mask.
Superloop
Within an EPSR ring configuration, a superloop is a data loop whose path traverses more
than a single EPSR ring. This occurrence is a fault condition that is usually do to a break in a
physical segment that is shared by the two rings. For a superloop condition to occur, the
two physical rings must share one or more data VLANs. Superloops can be prevented by
employing Superloop Protection. For more information, See
“Superloop Protection” on
page 57.17 .
Switch instance
A single switch chip with its associated ports, internal data interfaces, hardware tables,
and packet buffer memory.
S-VID
Service VLAN ID.
S-VLAN
Service VLAN.