Linksys SRW2008 Router Manual PDF (Setup & Configuration Guide)

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Chapter 5

Advanced Configuration

8-Port 10/100/1000 Gigabit Switch with Webview

Aggregate

Policer

Settings

The

Aggregate

Policer

button opens the New Aggregate Policer screen.

New Aggregate Policer

Advanced Mode > New Aggregate Policer

Aggregate Policer Name

Enter a name in this field.

Ingress Committed Information Rate (CIR)

Defines the

CIR in bits per second. This field is only relevant when the

Police value is Single.

Ingress Committed Burst Size (CBS)

Defines the CBS

in bytes per second. This field is only relevant when the

Police value is Single.

Exceed Action

Action assigned to incoming packets

exceeding the CIR. This field is only relevant when the

Police value is Single. Possible values are:

Drop

•

Drops packets exceeding the defined CIR value.

Remark

DSCP

•

Remarks

packet’s

DSCP

values

exceeding the defined CIR value.

None

•

Forwards packets exceeding the defined CIR

value.

Spanning Tree

Spanning Tree Protocol (STP) provides tree topography for

any arrangement of bridges. STP also provides one path

between end stations on a network, eliminating loops.

Loops occur when alternate routes exist between hosts.

Loops in an extended network can cause bridges to

forward traffic indefinitely, resulting in increased traffic

and reducing network efficiency.

The

device

supports

the

following

Spanning

Tree

versions:

Classic STP

•

Provides a single path between end

stations, avoiding and eliminating loops.

Rapid STP

•

Detects and uses network topologies

that provide faster convergence of the spanning tree,

without creating forwarding loops.

Multiple STP

•

Provides full connectivity for packets

allocated to any VLAN. Multiple STP is based on the

RSTP. In addition, Multiple STP transmits packets

assigned to different VLANs through different MST

regions. MST regions act as a single bridge.

Spanning Tree > STP Status

The

STP Status

screen describes the STP status on the

device.

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

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

zero

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

seconds. The range is 6 to 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

seconds. The range is 1 to 10 seconds.

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Chapter 5

Advanced Configuration

8-Port 10/100/1000 Gigabit Switch with Webview

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

seconds. The range is 4 to 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.

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

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.

Path Cost Default Values

Specifies the method used to

assign default path costs to STP ports. The possible field

values are:

Short

•

Specifies 1 through 65,535 range for port path

costs. This is the default value.

Long

•

Specifies 1 through 200,000,000 range for

port path costs.The default path costs assigned to an

interface varies according to the selected method.

NOTE:

Lower numeric values indicate higher

priority.

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 32768. The port priority value is provided in increments

of 4096. For example, 4096, 8192, 12288, etc. The range is

0 to 65535.

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

seconds. The range is 1 to 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

seconds. The range

is 6 to 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

seconds. The

range is 4 to 30 seconds.

Page 48 / 81

Chapter 5

Advanced Configuration

8-Port 10/100/1000 Gigabit Switch with Webview

Spanning Tree > STP Port Settings

Network administrators can assign STP settings to specific

interfaces using the

STP Interface Settings

screen.

The

STP Interface Settings

screen 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

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

which

the

port

operating.

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

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

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Chapter 5

Advanced Configuration

8-Port 10/100/1000 Gigabit Switch with Webview

network topologies that allow a faster STP convergence

without creating forwarding loops.

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.

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.

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

•

Point-to-point

links

are

automatically

established by the device.

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.

To run a migration test, press

Activate

next to the

Activate

Protocol Migration Test

field. The test sends Link Control

Protocol (LCP) packets to test if a data link is enabled.

Spanning Tree > MSTP Properties

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.

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 0-65535.

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

hops.

IST Master

Identifies the Spanning Tree Master instance.

The IST Master is the specified instance root.

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Chapter 5

Advanced Configuration

8-Port 10/100/1000 Gigabit Switch with Webview

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.

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 0-61440.

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.

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:

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