Troubleshooting Vlan Port Configuration; Configuring Link Aggregation - 3Com Switch 7700 Configuration Manual

Troubleshooting VLAN
Port Configuration
Configuring Link
Aggregation
The following configurations are used for Switch A, configure Switch B in a similar
way:
1 Enter the Ethernet port view of Ethernet1/0/1.
[SW7700] interface ethernet1/0/1
2 Set the Ethernet1/0/1 as a trunk port and allows VLAN 2, 6 through 50, and 100
to pass through.
[SW7700-Ethernet1/0/1] port link-type trunk
[SW7700-Ethernet1/0/1] port trunk permit vlan 2 6 to 50 100
3 Create the VLAN 100.
[SW7700] vlan 100
4 Configure the default VLAN ID of Ethernet1/0/1 as 100.
[SW7700-Ethernet1/0/1] port trunk pvid vlan 100
If the default VLAN ID configuration fails, take the following steps:
1 Execute the display interface or display port command to check if the port is a
trunk port or a hybrid port. If it is neither of them, configure it as a trunk port or a
hybrid port.
2 Then configure the default VLAN ID.
Link aggregation means aggregating several ports together to implement the
outgoing/incoming payload balance among the member ports and to enhance
connection reliability.
IEEE802.3ad-based link aggregation control protocol (LACP) implements dynamic
link aggregation and disaggregation and exchanges information with the peer
through LACP data unit (LACPDU). When LACP is enabled on it, the port notifies
the peer, by sending LACPDUs with the port's system priority, system MAC, port
priority, port number and operation key.
When the peer receives this port information, it compares the received
information with the information stored at other ports to determine which ports
can be aggregated so that the two parties can agree on adding ports to, or
deleting ports from, a dynamic aggregation group.
The operation key is a configuration set generated by LACP based on port setting
(speed, duplex mode, basic configuration and management key). When LACP is
enabled, the management key of a dynamic aggregation port is 0 by default, but
the management key of a static aggregation port consists with the aggregation
group ID. For a dynamic aggregation group, all member ports must have the same
operation key, while for a manual or static aggregation group, only the active
member ports must have the same operation key.
For the member ports in an aggregation group, their basic configurations must be
the same. That is, if one is a trunk port, others must be trunk ports also. If a port
turns into an access port, then others must change to access ports.
Basic configuration includes STP setting, QoS setting, VLAN setting, and port
setting. The STP setting includes STP enabling/disabling, link attribute

Configuring Link Aggregation

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