HP ProCurve Series 2810 User Manual

5-12
Multiple Instance Spanning-Tree Operation
802.1s Multiple Spanning Tree Protocol (MSTP)
an instance by using a port trunk. The following example shows how you can
use a port trunk with 802.1Q (tagged) VLANs and MSTP without unnecessarily
blocking any links or losing any bandwidth.
Figure 5-4. Example of Using a Trunked Link To Support Multiple VLAN
Connectivity within the Same MST Instance
Note All switches in a region should be configured with the VLANs used in that
region, and all ports linking MSTP switches together should be members of
all VLANs in the region. Otherwise, the path to the root for a given VLAN will
be broken if MSTP selects a spanning tree through a link that does not include
that VLAN.
Terminology
Bridge: See “MSTP Bridge”.
Common and Internal Spanning Tree (CIST): Comprises all LANs, STP,
and RSTP bridges and MSTP regions in a network. The CIST automatically
determines the MST regions in a network and defines the root bridge (switch)
Problem:
An MST instance with two
separate (non-trunked)
links blocks a VLAN link.
Solution:
Configure one trunked
link for the two VLAN
memberships.
Nodes 1 and 2 cannot
communicate because
MSTP is blocking the link.
Nodes 1 and 2 can communicate because the
MST instance sees the trunk as a single link and
802.1Q (tagged) VLANs enable the use of one
(trunked) link for both VLANs.

HP ProCurve Series 2810 Specifications

General

Layer	Layer 2
Form Factor	Rack-mountable
Power Supply	Internal
Jumbo Frame Support	Yes
Uplink Ports	4 x dual-personality ports (10/100/1000 or mini-GBIC)
Switching Capacity	48 Gbps
Throughput	35.7 Mpps
Forwarding Rate	35.7 million pps
Management	Web, SNMP, CLI
MAC Address Table Size	16000 entries
Routing Protocol	Static routing
Features	VLAN support, QoS, IGMP snooping
Operating Temperature	32°F to 113°F (0°C to 45°C)
Operating Humidity	15% to 95% non-condensing
Model	HP ProCurve Series 2810
Ports	24 x 10/100/1000 (Gigabit)