Mstp-To-Rstp Conversion (Pvst Interoperability); Link Aggregation - HP BladeSystem bc2000 - Blade PC Installation Manual

This period is considered too long for many applications. The delay is needed to allow enough time to
detect possible loops, allowing time for status changes to propagate and be acted upon by all relevant
devices.
In this switch, when network topology allows, faster convergence may be possible. The Rapid Spanning
Tree Protocol (RSTP) is designed to detect and make use of network topologies that allow a faster
convergence of the spanning tree, without creating forwarding loops. In a well designed network,
reconvergence time may take less than one second.
Multiple Spanning Tree (MST) enables grouping and associating VLANs to spanning tree instances.
Each Spanning Tree Instance has an independent topology of other Spanning Tree Instances. The
architecture provides multiple forwarding paths for data traffic, enabling load balancing in the network
and fault tolerance provision.

MSTP-to-RSTP Conversion (PVST Interoperability)

MSTP-to-RSTP Conversion extends the Multiple Spanning Tree Protocol (MSTP) standard to provide
limited interoperability with other proprietary Per-VLAN Spanning Tree Protocols such as Cisco's PVST/
PVST+. When enabled on the HP PC Blade Switch, MSTP-to-RSTP conversion is a global parameter
which applies to all ports that have Spanning Tree enabled. When this feature is enabled, switchport
mode trunk or general are not supported. An error message will be displayed if you attempt to change
an interface switchport mode to either trunk or general. If more than two VLANs are required, the four
primary uplinks can be used individually as access ports, but at the expense of loosing layer 2
redundancy. If more than two VLANs and redundancy are required, this feature must be disabled. HP
recommends using IEEE 802.1s Multiple Spanning Trees for situations where high speed L2
redundancy and support for more than two VLANs is needed.
Upon receiving a spanning tree BPDU, the switch translates it to an MSTP BPDU and assigns it to the
appropriate MST instance. Before transmitting an MSTP BPDU, the switch translates the BPDU to an
RSTP BPDU. If the switch is connected to another switch running 802.1D, the RSTP BPDU will be sent
as an STP BPDU as called for in the IEEE specification.
The default configuration for this feature is as follows:
●
MSTP enabled by default
●
VLAN 1 mapped to MST instance 1
●
MSTP-to-RSTP conversion enabled
●
VLAN 2 mapped to MST instance 2
● VLAN 3-4093 mapped to MST instance 15
Instance 0 is reserved for VLAN 4094 (default VLAN to drop all frames)
NOTE: When MSTP-to-RSTP is enabled (enabled by default) if you attempt to put any switchport into
trunk or general mode, you will receive the following error message: Port <Number>, extension
separated-bridge exist. Refer to paragraph one in this section for more detail.

Link Aggregation

The switch complies with IEEE 802.3ad static link aggregation (excluding LACP8) where several links
can be bundled into a single logical link of aggregate capacity.
Ports may be aggregated into link-aggregation port-groups. Each group must be composed of ports set
to the same speed and set to full-duplex operation. Ports in a link-aggregation group (LAG), also called
8 Chapter 1 Introduction ENWW