Linksys SRW208 Router Manual PDF (Setup & Configuration Guide)

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Chapter 5

Advanced Configuration

8-Port 10/100 Ethernet 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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Chapter 5

Advanced Configuration

8-Port 10/100 Ethernet Switch with Webview

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.

Alternate

•

Provides an alternate path to the root

device 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.

Interface Priority

Defines the interface priority for

specified instance. The default value is

128

Path Cost

Indicates the port contribution to the Spanning

Tree instance. The range should always be 1-200,000,000.

Designated Bridge ID

Indicates that the bridge ID

number that connects the link or shared LAN to the root.

Designated Port ID

Indicates that the Port ID number on

the designated bridge that connects the link or the shared

LAN to the root.

Designated Cost

Indicates that the default path cost

is assigned according to the method selected on the

Spanning Tree Global Settings screen.

Forward Transitions

Indicates the number of times

the port has changed from Forwarding state to Blocking

state.

Remaining Hops

Indicates the hops remaining to the

next destination.

Multicast > IGMP Snooping

When IGMP Snooping is enabled globally, all IGMP packets

are forwarded to the CPU. The CPU analyzes the incoming

packets and determines:

Which ports want to join which Multicast groups?

•

Which ports have Multicast routers generating IGMP

•

queries?

Which routing protocols are forwarding packets and

•

Multicast traffic?

Ports requesting to join a specific Multicast group issue an

IGMP report, specifying that Multicast group is accepting

members. This results in the creation of the Multicast

filtering database.

Enable IGMP Snooping

Indicates if IGMP Snooping is

enabled on the device. IGMP Snooping can be enabled

only if Bridge Multicast Filtering is enabled.

VLAN ID

Specifies the VLAN ID.

IGMP Status

Indicates if IGMP snooping is enabled on

the VLAN.

Auto Learn

Indicates if Auto Learn is enabled on the

device. If Auto Learn is enabled, the device automatically

learns where other Multicast groups are located. Enables

or disables Auto Learn on the Ethernet device.

Host Timeout

Indicates the amount of time host waits to

receive a message before timing out. The default time is

260

seconds.

MRouter Timeout

Indicates the amount of the time the

Multicast router waits to receive a message before it times

out. The default value is

300

seconds.

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Chapter 5

Advanced Configuration

8-Port 10/100 Ethernet Switch with Webview

Leave Timeout

Indicates the amount of time the host

waits, after requesting to leave the IGMP group and not

receiving a Join message from another station, before

timing out. If a Leave Timeout occurs, the switch notifies

the Multicast device to stop sending traffic The Leave

Timeout value is either user-defined, or an immediate

leave value. The default timeout is

seconds.

Multicast > Bridge Multicast

Multicast > Global Settings

The

Bridge Multicast

screen displays the ports and LAGs

attached to the Multicast service group in the Ports and

LAGs tables. The Port and LAG tables also reflect the

manner in which the port or LAGs joined the Multicast

group. Ports can be added either to existing groups or to

new Multicast service groups. The Bridge Multicast screen

permits new Multicast service groups to be created. The

Bridge Multicast screen also assigns ports to a specific

Multicast service address group.

The

Bridge Multicast

screen is divided into two areas,

Configuring Multicast and Multicast Table. The fields are

the same for both areas.

VLAN ID

Identifies a VLAN to be configured to a Multicast

service.

Bridge Multicast Address

Identifies the Multicast group

MAC address/IP address.

Bridge IP Multicast

DIsplays the port that can be added

to a Multicast service.

LAG

Displays LAG that can be added to a Multicast

service.

The configuration options are as follows:

Static

•

Indicates

the

port

user-defined.

Dynamic

•

Indicates

the

port

configured

dynamically.

Forbidden

•

Forbidden ports are not included the

Multicast group, even if IGMP snooping designated

the port to join a Multicast group.

None

•

The port is not configured for Multicast service.

The

Add to List

button adds the configured RMON event

to the Event Table at the bottom of the screen.

Multicast > Bridge Multicast Forward All

Multicast > Multicast Forward All

The

Bridge Multicast Forward All

screen contains fields

for attaching ports or LAGs to a device that is attached

to a neighboring Multicast router/switch. Once IGMP

Snooping is enabled, Multicast packets are forwarded to

the appropriate port or VLAN.

The

Bridge Multicast Forward All

screen contains the

following fields:

VLAN

DIsplays

the

VLAN

for

which

Multicast

parameters are displayed.

The configuration options are as follows:

None

•

The port is not configured for Multicast service.

Forbidden

•

Forbidden ports are not included the

Multicast group, even if IGMP snooping designated

the port to join a Multicast group.

Static

•

Indicates the port is user-defined.

Dynamic

•

Indicates

the

port

configured

dynamically.

SNMP > Global Parameters

The

Global Parameters

screen contains parameters for

defining SNMP notification parameters.

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Chapter 5

Advanced Configuration

8-Port 10/100 Ethernet Switch with Webview

SNMP > Global Parameters

Local Engine ID

Indicates the local device engine ID. The

field value is a hexadecimal string. Each byte in hexadecimal

character strings consists of two hexadecimal digits. Each

byte can be separated by a period or a colon. The Engine

ID must be defined before SNMPv3 is enabled. For stand-

alone devices, select a default Engine ID that is comprised

of Enterprise number and the default MAC address. For a

stackable system configure the Engine ID, and verify that

the Engine ID is unique for the administrative domain.

This prevents two devices in a network from having the

same Engine ID.

Use Default

Uses the device generated Engine ID. The

default Engine ID is based on the device MAC address and

is defined per standard as:

First 4 octets — first bit = 1, the rest is IANA Enterprise

•

number.

Fifth octet — Set to 3 to indicate the MAC address that

•

follows.

Last 6 octets — MAC address of the device.

•

SNMP Notifications

Indicates if the device can send

SNMP notifications.

Authentication

Notifications

Indicates

SNMP

Authentication failure notification is enabled on the

device.

SNMP > Views

SNMP Views provide access or block access to device

features or feature aspects. For example, a view can be

defined that states that SNMP Group A has Read Only

(R/O) access to Multicast groups, while SNMP Group B

has Read-Write (R/W) access to Multicast groups. Feature

access is granted via the MIB name, or MIB Object ID.\

View Name

Displays the user-defined views. The options

are as follows:

Default

•

Displays the default SNMP view for read and

read/write views.

DefaultSuper

•

Displays the default SNMP view for

administrator views.

Subtree ID Tree

Indicates the device feature OID included

or excluded in the selected SNMP view. The options to

select the Subtree are as follows:

Select from List

•

Select the Subtree from the list

provided.

Insert

•

Enables a Subtree not included in the Select

from List field to be entered.

View Type

Indicates if the defined OID branch will be

included or excluded in the selected SNMP view.

The

Add to List

button adds the Views configuration to

the Views Table at the bottom of the screen.

Page 55 / 86

Chapter 5

Advanced Configuration

8-Port 10/100 Ethernet Switch with Webview

SNMP > Group Profile

The

Group Profile

screen provides information for creating

SNMP groups and assigning SNMP access control privileges

to SNMP groups. Groups allow network managers to

assign access rights to specific device features, or features

aspects.

Group Name

Displays the user-defined group to which

access control rules are applied. The field range is up to

30 characters.

Security Model

Defines the SNMP version attached to

the group. The possible field values are:

SNMPv1

•

SNMPv1 is defined for the group.

SNMPv2

•

SNMPv2 is defined for the group.

SNMPv3

•

SNMPv3 is defined for the group.

Security Level

Defines the security level attached to the

group. Security levels apply to SNMPv3 only. The possible

field values are:

Authentication

•

Indicates

that

neither

the

Authentication nor the Privacy security levels are

assigned to the group.

Authentication

•

Authenticates SNMP messages, and

ensures the SNMP messages origin is authenticated.

Privacy

•

Encrypts SNMP messages.

Operation

Defines the group access rights. The possible

field values are:

Read

•

The management access is restricted to read-

only, and changes cannot be made to the assigned

SNMP view.

Write

•

The management access is read-write and

changes can be made to the assigned SNMP view.

Notify

•

Sends traps for the assigned SNMP view.

SNMP > Group Membership

The

Group Membership

screen provides information

for assigning SNMP access control privileges to SNMP

groups.

User name

Provides a user-defined local user list.

Engine ID

Indicates either the local or remote SNMP entity

to which the user is connected. Changing or removing the

local SNMP Engine ID deletes the SNMPv3 User Database.

Local

•

Indicates that the user is connected to a local

SNMP entity.

Remote

•

Indicates that the user is connected to a

remote SNMP entity. If the Engine ID is defined, remote

devices receive inform messages.

Group Name

Contains a list of user-defined SNMP

groups. SNMP groups are defined in the SNMP Group

Profile page.

Authentication Method

Indicates the Authentication

method used. The possible field values are:

None

•

Indicates that no authentication method is

used to authenticate the port.

MD5 Password

•

Indicates that port authentication

performed

via

HMAC-MD5-96

password

authentication.

SHA Password

•

Indicates that port authentication

performed

via

HMAC-SHA-96

password

authentication.

MD5

Key

•

Indicates

that

port

authentication

performed via the HMAC-MD5 algorithm.

SHA

Key

•

Indicates

that

port

authentication

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