Dell S4048T User Manual

Multiple Spanning Tree Protocol
(MSTP)
Multiple spanning tree protocol (MSTP) — specified in IEEE 802.1Q-2003 — is a rapid spanning tree protocol
(RSTP)-based spanning tree variation that improves per-VLAN spanning tree plus (PVST+). MSTP allows
multiple spanning tree instances and allows you to map many VLANs to one spanning tree instance to reduce
the total number of required instances.
Protocol Overview
MSTP — specified in IEEE 802.1Q-2003 — is a rapid spanning tree protocol (RSTP)-based spanning tree
variation that improves on per-VLAN spanning tree plus (PVST+). MSTP allows multiple spanning tree
instances and allows you to map many VLANs to one spanning tree instance to reduce the total number of
required instances.
In contrast, PVST+ allows a spanning tree instance for each VLAN. This 1:1 approach is not suitable if you have
many VLANs, because each spanning tree instance costs bandwidth and processing resources.
33
Multiple Spanning Tree Protocol (MSTP) 669

Dell S4048T Specifications

General

Switching Capacity	1.44 Tbps
Rack Units	1U
Form Factor	Rack-mountable
Power Device	Internal power supply
Power Redundancy	Optional
Product Type	Switch
Jumbo Frame Support	Yes
Routing Protocol	OSPF, BGP, RIP, VRRP, PIM-SM, IGMP
Remote Management Protocol	SNMP, RMON, Telnet, SSH
Features	Quality of Service (QoS), Jumbo Frames Support, Virtual Route Redundancy Protocol (VRRP), VLAN support, sFlow, Multiple Spanning Tree Protocol (MSTP), Rapid Spanning Tree Protocol (RSTP), IPv6 support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3ae
Dimensions (W x D x H)	17.3 in x 16 in x 1.7 in
Operating Temperature	0°C to 40 °C
Operating Humidity	10% to 90% (non-condensing)