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Page 51 / 96 Scroll up to view Page 46 - 50
Chapter 5
Advanced Configuration
44
WebView Switches
Spanning Tree > STP Status
The
STP Status
screen describes the STP status on the
device.
Spanning Tree > STP Status
Spanning Tree State
Indicates if STP is enabled on the
device.
Spanning Tree Mode
Indicates the STP mode by which
STP is enabled on the device.
Bridge
ID
Identifies
the
Bridge
priority
and
MAC
address.
Designated Root
Indicates the ID of the bridge with the
lowest path cost to the instance ID.
Root Port
Indicates the port number that offers the
lowest cost path from this bridge to the Root Bridge. It is
significant when the Bridge is not the Root. The default is
0
.
Root Path Cost
The cost of the path from this bridge to
the root.
Root
Maximum
Age
(sec)
Indicates
the
device
Maximum Age Time. The Maximum Age Time indicates
the amount of time in seconds a bridge waits before
sending configuration messages. The default max age is
20
seconds. The range is
6–40
seconds.
Root Hello Time (sec)
Indicates the device Hello Time.
The Hello Time indicates the amount of time in seconds
a root bridge waits between configuration messages. The
default is
2
seconds. The range is
1–10
seconds.
Root Forward delay (sec)
Indicates the device forward
delay time. The Forward Delay Time indicates the amount
of time in seconds a bridge remains in a listening and
learning state before forwarding packets. The default is
15
seconds. The range is
4–30
seconds.
Topology Changes Counts
Indicates the total amount of
STP state changes that have occurred.
Last Topology Change
Indicates the amount of time
that has elapsed since the bridge was initialized or reset,
and the last topographic change occurred. The time is
displayed in a day hour minute second format, for example,
2 days 5 hours 10 minutes and 4 seconds.
Spanning Tree > Global STP
The
Global STP
screen contains parameters for enabling
STP on the device.
Spanning Tree > Global STP
Global Setting
Spanning Tree State
Indicates if STP is enabled on the
device.
STP Operation Mode
Indicates the STP mode by which
STP is enabled on the device. The possible field values
are:
Classic STP
•
Enables Classic STP on the device. This is
the default value.
Rapid STP
•
Enables Rapid STP on the device.
Multiple STP
•
Enables Multiple STP on the device.
BPDU Handling
Determines how BPDU packets are
managed when STP is disabled on the port/device. BPDUs
are used to transmit spanning tree information. The
possible field values are:
Filtering
•
Filters BPDU packets when spanning tree is
disabled on an interface. This is the default value.
Flooding
•
Floods BPDU packets when spanning tree is
disabled on an interface.
Page 52 / 96
Chapter 5
Advanced Configuration
45
WebView Switches
Path Cost Default Values
Specifies the method used to
assign default path costs to STP ports. The possible field
values are:
Short
•
Specifies a
1–65,535
range for port path costs.
This is the default value.
Long
•
Specifies a
1–200,000,000
range for port path
costs. The default path costs assigned to an interface
varies according to the selected method.
Bridge Settings
Priority
Specifies the bridge priority value. When switches
or bridges are running STP, each is assigned a priority.
After exchanging BPDUs, the device with the lowest
priority value becomes the Root Bridge. The default value
is
32,768
. The port priority value is provided in increments
of 4096. For example, 4096, 8192, 12,288, and so on. The
range is
0–65,535
.
Hello Time
Specifies the device Hello Time. The Hello
Time indicates the amount of time in seconds a root bridge
waits between configuration messages. The default is
2
seconds. The range is
1–10
seconds.
Max Age
Specifies the device Maximum Age Time.
The Maximum Age Time indicates the amount of time
in seconds a bridge waits before sending configuration
messages. The default max age is
20
seconds. The range
is
6–40
seconds.
Forward Delay
Specifies the device forward delay time.
The Forward Delay Time indicates the amount of time in
seconds a bridge remains in a listening and learning state
before forwarding packets. The default is
15
seconds. The
range is
4–30
seconds.
Spanning Tree > STP Port Settings
Network administrators can assign STP settings to specific
interfaces using the
STP Interface Settings
screen.
Spanning Tree > STP Port Settings
The STP Interface Settings page contains the following
fields:
Interface
Indicates the port or LAG on which STP is
enabled.
STP
Indicates if STP is enabled on the port.
Port Fast
Indicates if Fast Link is enabled on the port.
If Fast Link mode is enabled for a port, the Port State
is automatically placed in the Forwarding state when
the port link is up. Fast Link optimizes the STP protocol
convergence. STP convergence can take
30–60
seconds
in large networks.
Port State
Displays the current STP state of a port. If
enabled, the port state determines what forwarding
action is taken on traffic. Possible port states are:
Disabled
•
Indicates that STP is currently disabled on
the port. The port forwards traffic while learning MAC
addresses.
Blocking
•
Indicates that the port is currently blocked
and cannot forward traffic or learn MAC addresses.
Blocking is displayed when Classic STP is enabled.
Listening
•
Indicates that the port is in Listening mode.
The port cannot forward traffic nor can it learn MAC
addresses.
Learning
•
Indicates that the port is in Learning mode.
The port cannot forward traffic, however it can learn
new MAC addresses.
Forwarding
•
Indicates that the port is in Forwarding
mode. The port can forward traffic and learn new MAC
addresses.
Speed
Indicates
the
speed
at
which
the
port
is
operating.
Page 53 / 96
Chapter 5
Advanced Configuration
46
WebView Switches
Path Cost
Indicates the port contribution to the root
path cost. The path cost is adjusted to a higher or lower
value, and is used to forward traffic when a path being
rerouted.
Default Path Cost
When selected the default path cost
is implemented.
Priority
Priority value of the port. The priority value
influences the port choice when a bridge has two ports
connected in a loop. The priority value is between
0–240
.
The priority value is provided in increments of 16.
Designated Bridge ID
Indicates the bridge priority and
the MAC Address of the designated bridge.
Designated Port ID
Indicates the selected port’s priority
and interface.
Designated
Cost
Indicates
the
cost
of
the
port
participating in the STP topology. Ports with a lower cost
are less likely to be blocked if STP detects loops.
Forward Transitions
Indicates the number of times the
port has changed from the Blocking state to Forwarding
state.
Spanning Tree > RSTP Port Settings
While the classic spanning tree prevents Layer 2 forwarding
loops in a general network topology, convergence can take
between
30–60
seconds. This time may delay detecting
possible loops, and propagating status topology changes.
Rapid Spanning Tree Protocol (RSTP) detects and uses
network topologies that allow a faster STP convergence
without creating forwarding loops.
Spanning Tree > RSTP Port Settings
Interface
Displays the port or LAG on which Rapid STP
is enabled.
Role
Indicates the port role assigned by the STP algorithm
in order to provide to STP paths. The possible field values
are:
Root
•
Provides the lowest cost path to forward packets
to root switch.
Designated
•
Indicates that the port or LAG via which
the designated switch is attached to the LAN.
Alternate
•
Provides an alternate path to the root
switch from the root interface.
Backup
•
Provides a backup path to the designated
port path toward the Spanning Tree leaves. Backup
ports occur only when two ports are connected in a
loop by a point-to-point link. Backup ports also occur
when a LAN has two or more connections connected
to a shared segment.
Disabled
•
Indicates the port is not participating in the
Spanning Tree.
Mode
Indicates the current Spanning Tree mode. The
Spanning Tree mode is selected in the
Global STP
screen.
The possible field values are:
Classic STP
•
Indicates that Classic STP is enabled on
the device.
Rapid STP
•
Indicates that Rapid STP is enabled on the
device.
Page 54 / 96
Chapter 5
Advanced Configuration
47
WebView Switches
Multiple STP
•
Indicates that Multiple STP is enabled
on the device.
Fast Link
Indicates if Fast Link is enabled or disabled for
the port or LAG. If Fast Link is enabled for a port, the port is
automatically placed in the forwarding state (configurable
from Spanning Tree > STP Port Settings).
Port State
Indicates if RSTP is enabled on the interface.
Point-to-Point Admin Status
Indicates if a point-to-point
links are established, or permits the device to establish a
point-to-point link. The possible field values are:
Auto
•
Enables automatic establishment of point-to-
point links.
Enabled
•
Enables the device to establish a point-to-
point link. To establish communications over a point-
to-point link, the originating PPP first sends Link
Control Protocol (LCP) packets to configure and test
the data link. After a link is established and optional
facilities are negotiated as needed by the LCP, the
originating PPP sends Network Control Protocols (NCP)
packets to select and configure one or more network
layer protocols. When each of the chosen network
layer protocols has been configured, packets from
each network layer protocol can be sent over the link.
The link remains configured for communications until
explicit LCP or NCP packets close the link, or until some
external event occurs. This is the actual switch port link
type. It may differ from the administrative state.
Disabled
•
Disables point-to-point link.
Point-to-Point Oper Status
Indicates the Point-to-Point
operating state.
Activate Protocol Migration Test
This option sends
Link Control Protocol (LCP) packets to test if a data link is
enabled.
Spanning Tree > MSTP Properties
Multiple Spanning Tree Protocol (MSTP) provides differing
load balancing scenarios. For example, while port A is
blocked in one STP instance, the same port is placed in
the Forwarding State in another STP instance. The
MSTP
Properties
screen contains information for defining global
MSTP settings, including region names, MSTP revisions,
and maximum hops.
Spanning Tree > MSTP Properties
The
MSTP Properties
screen contains the following fields:
Region Name
Provides a user-defined STP region name.
Revision
Defines unsigned 16-bit number that identifies
the revision of the current MST configuration. The revision
number is required as part of the MST configuration. The
possible field range
0–65,535
.
Max Hops
Indicates the total number of hops that occur
in a specific region before the BPDU is discarded. Once the
BPDU is discarded, the port information is aged out. The
possible field range is
1–40
. The field default is
20
hops.
IST Master
Identifies the Spanning Tree Master instance.
The IST Master is the specified instance root.
Page 55 / 96
Chapter 5
Advanced Configuration
48
WebView Switches
Spanning Tree > MSTP Instance Settings
MSTP operation maps VLANs into STP instances. Packets
assigned to various VLANs are transmitted along different
paths within Multiple Spanning Trees Regions (MST
Regions). Regions are one or more Multiple Spanning
Tree bridges by which frames can be transmitted. In
configuring MST, the MST region to which the device
belongs is defined. A configuration consists of the name,
revision, and region to which the device belongs.
Spanning Tree > MSTP Instance Settings
Network Administrators can define MSTP Instances
settings using the
MSTP Instance Settings
screen.
Instance ID
Defines the VLAN group to which the
interface is assigned.
Included VLAN
Maps the selected VLAN to the selected
instance. Each VLAN belongs to one instance.
Bridge Priority
Specifies the selected spanning tree
instance device priority. The field range is
0–61,440
.
Designated Root Bridge ID
Indicates the ID of the bridge
with the lowest path cost to the instance ID.
Root Port
Indicates the selected instance’s root port.
Root Path Cost
Indicates the selected instance’s path
cost.
Bridge ID
Indicates the bridge ID of the selected
instance.
Remaining Hops
Indicates the number of hops remaining
to the next destination.
Spanning Tree > MSTP Interface Settings
Network Administrators can assign MSTP Interface settings
using the
MSTP Interface Settings
screen.
Spanning Tree > MSTP Interface Settings
The
MSTP Interface Settings
screen contains the following
fields:
Instance ID
Lists the MSTP instances configured on the
device. Possible field range is
0–15
.
Interface
Displays the interface for which the MSTP
settings are displayed. The possible field values are:
Port
•
Specifies the port for which the MSTP settings
are displayed.
LAG
•
Specifies the LAG for which the MSTP settings
are displayed.
Port State
Indicates whether the port is enabled for the
specific instance.
Type
Indicates if the port is a point-to-point port, or a
port connected to a hub. The possible field values are:
Boundary Port
•
Indicates the port is a boundary port.
A Boundary port attaches MST bridges to LAN in an
outlying region. If the port is a boundary port, it also
indicates whether the device on the other side of the
link is working in RSTP or STP mode.
Master Port
•
Indicates the port is a master port. A
Master port provides connectivity from a MSTP region
to the outlying CIST root.
Internal
•
Indicates the port is an internal port.
Role
Indicates the port role assigned by the STP algorithm
in order to provide to STP paths. The possible field values
are:
Root
•
Provides the lowest cost path to forward packets
to root device.
Designated
•
Indicates the port or LAG via which the
designated device is attached to the LAN.

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