
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
1357911
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
1357911
2 4 6 8 10 12
13 15 17 19 21 23R
14 16 18 20 22 24R
AT-9424T/SP
Gigabit Ethernet Switch
1357911131517192123R
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
Comentários a estes Manuais