Mixed Stp And Rstp Networks; Spanning Tree And Vlans - Allied Telesis AT-GS950/48 User Manual

Chapter 4: STP and RSTP
Mixed STP and
RSTP IEEE 802.1w is fully compliant with STP IEEE 802.1d. Your network
can consist of bridges running both protocols. STP and RSTP in the same
RSTP Networks
network can operate together to create a single spanning tree domain.
If you decide to activate spanning tree on the switch, Allied Telesis
recommends RSTP instead of STP, even when all of other switches in the
network are running STP. The AT-GS950/48 switch can combine RSTP
with the STP of the other switches. The switches monitors the traffic on
each port for BPDU packets. Ports that receive RSTP BPDU packets
operate in RSTP mode, while ports receiving STP BPDU packets operate
in STP mode.
Spanning Tree
The spanning tree implementation in the AT-S116 Management software
can be a single-instance spanning tree as described in this chapter. If you
and VLANs
choose to define multiple spanning trees on this switch, go to Chapter 5,
"Multiple Spanning Tree Protocol" on page 87.
The single spanning tree encompasses all ports on the switch. If the ports
are divided into different VLANs, the spanning tree crosses the VLAN
boundaries. This can pose a problem in networks containing multiple
VLANs that span two bridges and are connected with untagged ports. In
this situation, spanning tree blocks a data link because it detects a
suspected data loop. This can cause fragmentation of your VLANs.
This issue is illustrated in Figure 26 on page 79. VLANs 1 – 3 span two
switches. One link consisting of untagged ports connect each VLAN. If
STP or RSTP is activated on the switches, two of the links are disabled.
As a direct result, two VLANs are disconnected between the bridges. In
this example, the ports (on the non-root switch) that link the two parts of
the VLANs 2 - 3 are changed to the blocking state, which disrupts these
VLAN connections.
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