Hewlett-Packard GbE2c - Blc Layer 2/3 Fiber SFP Option Application Manual

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Spanning Tree Protocol 57
Adding and removing ports from STGs
Information on adding and removing ports from STGs is as follows:
By default, all ports belong to VLAN 1 and STG 1.
Each port is always a member of at least one VLAN. Each VLAN is always a member of at least one STG. Port
membership within VLANs can be changed, and VLAN membership within STGs can be changed. To move a
port from one STG to another, move the VLAN to which the port belongs, or move the port to a VLAN that
belongs to the STG.
When you remove a port from a VLAN, that port is also removed from the STG to which the VLAN belongs.
However, if that port belongs to another VLAN in the same STG, the port remains in the STG.
If you remove an untagged port from a non-default VLAN and STG, it is added to VLAN 1 and STG 1.
The relationship between ports, trunk groups, VLANs, and spanning trees is shown in the following table.
Table 11 Ports, trunk groups, and VLANs
Switch element Belongs to
Port Trunk group, or one or more VLANs
Trunk group Only one VLAN
VLAN (non-default) One Spanning Tree Group
Assigning cost to ports and trunk groups
When you configure a trunk group to participate in a Spanning Tree Group, all ports must have the same Spanning
Tree configuration, as follows:
port priority
path cost
link type
Edge port status
Port Fast Forward status
Assign lower path costs on each member of a trunk group, to ensure the trunk group remains in the Forwarding state.
Multiple Spanning Trees
Each switch supports a maximum of 128 Spanning Tree Groups (STGs). Multiple STGs provide multiple data paths,
which can be used for load-balancing and redundancy.
You enable independent links on two switches using multiple STGs by configuring each path with a different VLAN
and then assigning each VLAN to a separate STG. Each STG is independent. Each STG sends its own Bridge
Protocol Data Units (BPDUs), and each STG must be independently configured.
The STG, or bridge group, forms a loop-free topology that includes one or more virtual LANs (VLANs). The switch
supports 128 STGs running simultaneously. The default STG 1 supports IEEE 802.1d Spanning Tree Protocol, and
may contain more than one VLAN. All other STGs support Per VLAN Spanning Tree (PVST+), and may contain only
one VLAN each. The switch can support multiple VLANs in STGs 2-128; however, you must enable IEEE 802.1s
Multiple Spanning Tree Protocol mode. For more information, see the “RSTP and MSTP” chapter in this guide.
Why do we need Multiple Spanning Trees?
The following figure shows a simple example of why we need multiple Spanning Trees. This example assumes that
port 17 and 18 are not part of Trunk Group 1. Two VLANs (VLAN 1 and VLAN 2) exist between Switch 1 and
Switch 2. If the same Spanning Tree Group is enabled on both switches, the switches see an apparent loop and block
port 18 on Switch 2, which cuts off communication between the switches for VLAN 2.