Qtech QSW-3900-24-SFP-AC [56/245] Manual link aggregation
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Qtech QSW-3900-24-SFP-AC [56/245] Manual link aggregation

Qtech QSW-3900-48-SFP-DC [56/245] Manual link aggregation
QTECH Software Configuration Manual
4-55
the remote system compares the received information with the information received on other ports to determine the
ports that can operate as selected ports. This allows the two systems to reach agreement on the states of the related
ports
When aggregating ports, link aggregation control automatically assigns each port an operational key based
on its rate, duplex mode, and other basic configurations. In an LACP aggregation group, all ports share the same
operational key; in a manual or static LACP aggregation, the selected ports share the same operational key.
Basic configurations are :
1. 13 static or dynamic channel groups can be configured and at most 12 interface members can be
configured in each group, and at most 8 interfaces can be convergent at the same time in each group which is
determined by up/down status, interface number, LACP priority. Each group is defined to be a channel group, and the
command line is configured around it.
2. Load balance strategy of each group can be divided into source MAC, destination MAC, source and
destination MAC, source IP, destination IP, and source and destination IP. The default strategy is source MAC.
3. System and interface LACP priority can be configured. The default system priority is 32768, and interface
priority is 128. To remove system and interface priority is to restore them to default ones.
4. LACP protocol of each interface can be configured. In static mode, interface is static convergent, and
LACP protocol does not run; in active mode, interface will initiate LACP negotiation actively; in passive mode,
interface only can response LACP negotiation. When interconnecting with other device, static mode only can
interconnect with static mode; active can interconnect with active and passive mode, but passive mode only can
interconnect with active mode. The default mode of interface is ACTIVE mode.
Each convergent interface need same layer 2 features, so there are following restrictions to interfaces in a
channel group :
Static convergent interfaces and dynamic convergent interfaces can not be in a same channel group, but there
can be static convergent channel as well as dynamic convergent channel.
Each interface in a same channel group must possess the same features as following : interface speed rate,
working mode of full duplex, STP/GVRP/GMRP function, STP cost, STP interface priority, VLAN features (interface
mode, PVID, VLAN belonged to, tag vlan list of access interface, allowed vlan list of trunk interface) and layer 2
multicast group belonged to.
If modifying the feature of one interface in the channel group, other interfaces will be modified
automatically in the same place. The feature refers to point 2.
After convergence, static hardware item (ARL, MARL, PTABLE, VTABLE) will be modified, but there will
be delay.
After convergence, only host interface can send CPU packet. If STP changes status of some interface, the
status of the whole channel group will be changed.
After convergence, when transferring layer 2 protocol packet, STP/GARP/GNLINK will not transfer packet
to the current channel grou. If transferring to other channel group, only one packet will be transferred.
If there are members in the channel group, this channel group cannot be deleted. Delete interface members
first.
Influence on choosing link redundancy caused by LACP system and interface priority. LACP provides link
redundancy mechanism which needs to guarantee the redundancy consistency of two interconnected switches and
user can configure redundancy link which is realized by system and interface priority. The redundancy choosing
follows the following steps :
First, determine which switch is the choosing standard. For LACP packets interaction, each of the two
switches knows each other’s LACP system priority and system MAC and compares the LACP system priority to
choose the smaller one; if the system priority is the same, compare MAC and choose the smaller one.
Then, choose redundancy link according to the interface parameter of the chosen switch. Compare interface
LACP priority, and choose the inferior one to be redundant. If the priorities are the same, choose the interface whose
interface number is larger to be redundant.
Link aggregation aggregates multiple physical Ethernet ports into one logical link, also called a logical
group, to increase reliability and bandwidth.
4.4.2 Manual Link Aggregation
4.4.2.1 Overview
Manual aggregations are created manually. Member ports in a manual aggregation are LACP-disabled.
4.4.2.2 Port states in a manual aggregation
In a manual aggregation group, ports are either selected or unselected. Selected ports can receive and
transmit data frames whereas unselected ones cannot. Among all selected ports, the one with the lowest port number
is the master port and others are member ports.
When setting the state of ports in a manual aggregation group, the system considers the following :

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