Port trunking overview, Port trunking guidelines – Allied Telesis AT-S63 User Manual
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Chapter 8: Port Trunking
142
Section I: Basic Features
Port Trunking Overview
A port trunk is an economical way for you to increase the bandwidth
between two Ethernet switches. A port trunk is a group of ports that
have been grouped together to function as one logical path. A port
trunk increases the bandwidth between switches and is useful in
situations where a single physical data link between switches is
insufficient to handle the traffic load.
A port trunk always sends packets from a particular source to a particular
destination over the same link within the trunk. A single link is
designated for flooding broadcasts and packets of unknown destination.
The example in Figure 40 consists of a port trunk of four data links
between two AT-9400 Series switches.
Figure 40. Port Trunk Example
Port Trunking
Guidelines
Observe the following guidelines when you create a port trunk:
❑ The switch can support up to six port trunks at a time.
❑ A port trunk can contain up to eight ports.
❑ The ports of a port trunk must be of the same medium type. For
example, they can be all twisted pair ports or all fiber optic ports.
❑ The ports of a trunk can be either consecutive (for example ports
5-9) or nonconsecutive (for example, ports 4, 8, 11, 20).
❑ The speed, duplex mode, and flow control settings must be the
same for all the ports in a trunk.
❑ The ports of a port trunk must be untagged members of the same
VLAN. A port trunk cannot consist of untagged ports from
different VLANs.
FAULT
RPS
MASTER
POWER
CLASS 1
LASER PRODUCT
STATUS
TERMINAL
PORT
1
3
5
7
9
11
2
4
6
8
10
12
13
15
17
19
21
23R
14
16
18
20
22
24R
AT-9424T/SP
Gigabit Ethernet Switch
1
3
5
7
9
11
13
15
17
19
21
23R
2
4
6
8
10
12
14
16
18
20
22
24R
23
24
L/A
D/C
D/C
L/A
D/C
L/A
1000 LINK / ACT
HDX / COL
FDX
10/100 LINK / ACT
PORT ACTIVITY
L/A
1000 LINK / ACT
SFP
SFP
24
SFP
23
FAULT
RPS
MASTER
POWER
CLASS 1
LASER PRODUCT
STATUS
TERMINAL
PORT
1
3
5
7
9
11
2
4
6
8
10
12
13
15
17
19
21
23R
14
16
18
20
22
24R
AT-9424T/SP
Gigabit Ethernet Switch
1
3
5
7
9
11
13
15
17
19
21
23R
2
4
6
8
10
12
14
16
18
20
22
24R
23
24
L/A
D/C
D/C
L/A
D/C
L/A
1000 LINK / ACT
HDX / COL
FDX
10/100 LINK / ACT
PORT ACTIVITY
L/A
1000 LINK / ACT
SFP
SFP
24
SFP
23