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Figure 4- 3. Port Trunking Group Entry Table

To configure port trunk groups, click the

Add

button to add a new trunk group and use the

menu

Link Aggregation Group Configuration

menu (see example below) to set up trunk

groups. To modify a port trunk group, double-click on it to bring up the

Link Aggregation

Group Configuration

menu. To delete a port trunk group, click the

Delete

option in the

Current Link Aggregation Group Entries

table.

Figure 4- 4. Link Aggregation Group Configuration

The user-changeable parameters are as follows:

Parameter

Description

Group ID

Select an ID number for the group.

Group Name

Type in a name for the group (optional).

Type

This pull-down menu allows you to select between Static and LACP (Link

Aggregation Control Protocol.)

LACP allows for the automatic detection of

links in a Port Trunking Group.

State

Trunk groups can be toggled between

Enabled

and

Disabled

. This is used

to turn a port trunking group on or off This is useful for diagnostics to

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29

to turn a port trunking group on or off. This is useful for diagnostics, to

quickly isolate a bandwidth intensive network device or to have an absolute

backup aggregation group that is not under automatic control.

Master Port

Choose the Master port for the trunk group.

Choose Member

Ports

Choose the members of a trunked group. Up to 8 ports per group can be

assigned to a group.

Flooding Port

A trunking group must designate one port to allow transmission of

broadcasts and unknown unicasts.

Configuring LACP Port Settings

To configure the LACP port settings, click the

LACP Port Settings

link to open the

Lacp

Settings

menu, as shown below.

Figure 4- 5. LACP Configuration

The user-changeable parameters are as follows:

Parameter

Description

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30

Unit

Select the module that contains the ports you want to configure LACP for.

The modules are numbered from 1 at the top (just below the CPU module),

to 8 (the slot farthest from the CPU module).

From

Select the first in a group of ports you want to configure LACP for.

To

Select the last in a group of ports you want to configure LACP for.

Mode

You can choose between

Passive

and

Active

LACP modes.

In the

Passive

mode, the port does not initiate the exchange of LACP

packets, but does understand the incoming LACP packets.

Links can only

be formed with ports that are running LACP in the

Active

mode.

In the

Active

mode, the port initiates the negotiation and will form links with

other ports if the other end is running LACP.

Configuring IGMP

Internet Group Management Protocol (IGMP)

snooping allows the Switch to recognize

IGMP queries and reports sent between network stations or devices and an IGMP host. When

enabled for IGMP snooping, the Switch can open or close a port to a specific device based on

IGMP messages passing through the Switch.

In order to use IGMP Snooping it must first be enabled for the entire Switch (see

Advanced

Settings

). You may then fine-tune the settings for each VLAN using the

IGMP Snooping

link in the

Configuration

folder. When enabled for IGMP snooping, the Switch can open or

close a port to a specific Multicast group member based on IGMP messages sent from the

device to the IGMP host or vice versa. The Switch monitors IGMP messages and discontinues

forwarding multicast packets when there are no longer hosts requesting that they continue.

IGMP Snooping

Use the IGMP Snooping Group Entry Table to view IGMP Snooping status. To modify

settings, click the Modify button for the VLAN ID you want to change.

Figure 4- 6. Current IGMP Snooping Group Entries

Clicking the

Modify

button will bring up the

IGMP Snooping Settings

menu.

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31

Figure 4- 7. IGMP Snooping Settings window

The following parameters may be viewed or modified:

Parameter

Description

Query Interval

The Query Interval field is used to set the time (in seconds) between

transmitting IGMP queries. Entries between 1 and 9,999 seconds are

allowed. Default = 125.

Max Response Time

This determines the maximum amount of time in seconds allowed before

sending an IGMP response report. The Max Response Time field allows

an entry between 1 and 25 (seconds).

Default = 10.

Robustness Variable

Adjust this variable according to expected packet loss. If packet loss on

the VLAN is expected to be high, the Robustness Variable should be

increased to accommodate increased packet loss. This entry field allows

an entry of 2 to 255. Default = 2.

Last Member Query

Interval

Specifies the maximum amount of time between group-specific query

messages, including those sent in response to leave group messages.

Default = 1.

Host Timeout

This is the maximum amount of time in seconds allowed for a host to

continue membership in a multicast group without the Switch receiving a

host membership report. Default = 260.

Route Timeout

This is the maximum amount of time in seconds a route is kept in the

forwarding table without receiving a membership report. Default = 260.

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32

Leave Timer

This specifies the maximum amount of time in seconds between the

Switch receiving a leave group message from a host, and the Switch

issuing a group membership query. If no response to the membership

query is received before the Leave Timer expires, the (multicast)

forwarding entry for that host is deleted.

Querier State

Choose

Querier

to enable transmitting IGMP Query packets or

Non-

Querier

to disable. The default value is

Non-Querier

.

State

Select

Enabled

to implement IGMP Snooping. This is

Disabled

by

default.

Static Router Ports

A static router port is a port that has a multicast router attached to it. Generally, this router

would have a connection to a WAN or to the Internet. Establishing a router port will allow

multicast packets coming from the router to be propagated through the network, as well as

allowing multicast messages (IGMP) coming from the network to be propagated to the router.

A router port has the following behavior:

•

All IGMP Report packets will be forwarded to the router port.

•

IGMP queries (from the router port) will be flooded to all ports.

•

All UDP multicast packets will be forwarded to the router port. Because routers do not

send IGMP reports or implement IGMP snooping, a multicast router connected to the

router port of the Layer 3 switch would not be able to receive UDP data streams unless

the UDP multicast packets were all forwarded to the router port.

A router port will be dynamically configured when IGMP query packets, RIPv2 multicast,

DVMRP multicast, PIM-DM multicast packets are detected flowing into a port.

Open the

IGMP

folder and the click on the

Static Router Ports Entry

link to open the

Current Static Router Ports Entries

page, as shown below.

Figure 4- 8. Current Static Router Ports Entries window

The

Current Static Router Ports Entries

page (shown above) displays all of the current

entries to the Switch’s static router port table.

To add or modify an entry, click the

Modify

button.

This will open the

Static Router Ports Settings

page, as shown below.