Configuration Guide User guide

FastIron Configuration Guide 1087
53-1002494-02
Chapter
27
Spanning Tree Protocol
Table 192 lists the individual Brocade FastIron switches and the Spanning Tree Protocol (STP)
features they support. These features are supported in the Layer 2, base Layer 3, edge Layer 3,
and full Layer 3 software images, except where explicitly noted.
STP overview
The Spanning Tree Protocol (STP) eliminates Layer 2 loops in networks, by selectively blocking
some ports and allowing other ports to forward traffic, based on global (bridge) and local (port)
parameters you can configure.
STP related features, such as RSTP and PVST, extend the operation of standard STP, enabling you
to fine-tune standard STP and avoid some of its limitations.
You can enable or disable STP on a global basis (for the entire device), a port-based VLAN basis (for
the individual Layer 2 broadcast domain), or an individual port basis.
Configuration procedures are provided for the standard STP bridge and port parameters as well as
Brocade features listed in Table 198.
TABLE 192 Supported STP features
Feature FESX
FSX 800
FSX 1600
FWS FCX ICX 6610 ICX 6430
ICX 6450
802.1s Multiple Spanning Tree Yes Yes Yes Yes Yes
802.1W Rapid Spanning Tree (RSTP) Yes Yes Yes Yes Yes
802.1D Spanning Tree Support Yes Yes Yes Yes Yes
Enhanced IronSpan support includes Fast
Port Span, Fast Uplink Span, and
Single-instance Span
Yes Yes Yes Yes Yes
FastIron Layer 2 devices (switches)
support up to 254 spanning tree
instances for VLANs.
Yes Yes Yes Yes 32 for ICX
6430
Layer 3 devices (routers) support up to
254 spanning tree instances for VLANs.
Yes Yes Yes Yes ICX 6450
only
PVST/PVST+ compatibility Yes Yes Yes Yes Yes
PVRST+ compatibility Yes Yes Yes Yes Yes
BPDU Guard Yes Yes Yes Yes Yes
Root Guard Yes Yes Yes Yes Yes
Error disable recovery Yes Yes Yes Yes Yes