Ieee 802.1 Q-Based Vlan; Spanning Tree Protocol; Snmp - HP 438031-B21 - 1:10Gb Ethernet BL-c Switch User Manual

IEEE 802.1 Q-based VLAN

The switch provides support for a total of 1000 IEEE 802.1Q VLANs for server grouping and isolation. A
VLAN is a network segment configured according to a logical scheme rather than a physical layout.
VLANs are used to combine any collection of LAN segments into an autonomous user group that appears
as a single LAN.
VLANs also logically segment the physical network into different broadcast domains so that packets are
forwarded only between ports within the VLAN. This technology enhances performance by conserving
bandwidth and improves security by limiting traffic to specific domains. For example, isolate the server
blade iLO ports from the rest of the NICs. The iLO ports on Switch 2 are assigned to their own VLAN and
go to a dedicated uplink or share an uplink using VLAN tagging.
IMPORTANT:
maximum switch performance, HP recommends being judicious when configuring the number
of VLANs.
NOTE:

Spanning Tree Protocol

The switch supports IEEE 802.1D STP, which allows the blocking of links that form loops between switches
in a network. When multiple links between switches are detected, a primary link is established.
Duplicated links are blocked from use and become standby links. If the primary link fails, the standby link
is activated.
In addition, the switch provides a spanning tree domain per VLAN. The switch is compatible with Cisco
PVST+ and Cisco PVST, when the other device is configured as untagged or configured to use 802.1q
tagging. Thirty-two spanning tree domains are supported per switch.
NOTE:
The switch also provides IEEE 802.1s-based MSTP and IEEE 802.1w-based RSTP.

SNMP

The switch is configured and monitored remotely from an SNMP-based network management station. The
switch supports industry-standard SNMP MIBs and proprietary HP enterprise switch MIBs for fault
detection and monitoring of switch functionality. In addition, the switch supports various environmental
traps such as temperature and fan failure traps.
To secure the management interface, the switch administrator configures community strings with two levels
of access: Read and Read/Write. Access to the switch is also restricted to only management stations that
are members of a specific IP network. This is achieved by configuring the address/mask of that specific
network as a restricted management network address/mask.
The greater the number of VLANs, the greater the switch CPU utilization. For
VLAN 4095 is reserved for future functionality.
STP 32 is reserved for future functionality.
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Introduction 11