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v All of the ports in a trunk must be treated as a whole when moved from or to,
v You must enable the trunk before connecting any cable between the switches to
v Disconnect all trunk port cables or disable the trunk ports before removing a port
v The configuration of the lowest-numbered port in the group becomes the
v Load balancing is automatically applied to the ports in the trunked group. A link
v The STP treats a port trunking group as a single link on the switch level. On the
v Use the Distribution Method to specify the method used to differentiate packets
802.3ad link aggregation
Notes:
1. The Mode determines whether or not a port is enabled to join or create a LAG.
2. The Administrator key controls the way that links are aggregated. Use the same
3. The Operator key is used by the port to communicate with other Link
Link aggregation group recommendations
The external ports on a BladeCenter Ethernet switch module can be configured in
these ways:
v Multiport LAG using the LACP – 1 Gbps per port
v Multiport trunk – 1 Gbps per port
v Single port link – 1 Gbps
v Multiport LAG using LACP – 100 Mbps per port
v Multiport trunk, 100 Mbps per port
The recommended configuration is:
v Define the four ports of each Ethernet switch module as a 4-port IEEE 802.3
v Configure the LACP – define a minimum of two ports for an active group within a
By defining a LAG port group and configuring LACP, LACP allows a subset of the
LAG ports to be active, meaning two, three, or four ports are active which provides
2, 3, or 4 Gbps of bandwidth between the BladeCenter T unit and the adjacent
router or external switch. When a LAG is configured correctly in both the
BladeCenter T unit and the adjoining device, the STP treats the group as a single
link.
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BladeCenter T Types 8720 and 8730: Planning and Installation Guide
added, or deleted from a VLAN.
avoid creating a data loop.
trunk to avoid creating a data loop.
configuration for all ports in the port trunking group. This port becomes the
Master Port of the group. All configuration options applied to the Master Port are
also applied to the entire port trunking group.
failure within the group causes the network traffic to be directed to the remaining
links in the group.
port level, the STP uses the port parameters of the Master Port in the calculation
of port cost and in determining the state of the port trunking group. If two
redundant port trunking groups are configured on the switch, STP blocks one
entire group in the same way that STP blocks a single port that has a redundant
link.
that go through your network. The method that you choose is used as a hashing
function to determine which packets go to which port.
Administrator key for all ports to be aggregated together.
Aggregation Control Protocol (LACP) switches.
LAG.
LAG to provide at least 2-Gbps full-duplex bandwidth.
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