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Figure5-3 Connection topology of two M-LAG member devices in the same rack
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Top of rack connection scheme
You can install M-LAG member switches in two different racks side by side to deploy a top of rack
(ToR) solution as shown in Figure5-4. Use transceiver modules and optical fibers for connection if a
large distance exists between the member switches.
Figure5-4 Top of rack connection scheme
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Configuring the M-LAG system settings
After you install the M-LAG member switches, start and log in to each member switch to configure
basic M-LAG system settings, including:
•
M-LAG system MAC address.
•
M-LAG system ID.
•
M-LAG system priority.
•
Peer-link interface settings.
•
Keepalive parameters.
For information about logging in to the switch, see H3C S6805 & S6825 & S6850 & S9850 Switch
Series Fundamentals Configuration Guide.
For information about configuring the M-LAG system settings, see M-LAG configuration in H3C
S6805 & S6825 & S6850 & S9850 Ethernet Switch Series Layer 2—LAN Switching Configuration
Guide.
Restrictions and guidelines
You can set up an M-LAG system with only two member devices. For the M-LAG member devices to
be identified as a single M-LAG system, you must configure the same M-LAG system MAC address
and M-LAG system priority for them. To distinguish between the two member devices, assign them
different M-LAG system IDs.
Make sure the MAC address of the M-LAG system is unique.
For correct packet forwarding, delete M-LAG configuration from an M-LAG member device if it
leaves its M-LAG system.
When you bulk shut down physical interfaces on an M-LAG member device for service changes or
hardware replacement, shut down the physical interfaces used for keepalive detection prior to the
physical member ports of the peer-link interface. If you fail to do so, link flapping will occur on the
member ports of M-LAG interfaces.
You must configure the keepalive link interfaces (including physical ports and logical interfaces) as
M-LAG reserved interfaces. This ensures that these interfaces will not be MAD down when the peer
link fails.
Keepalive
Peer-link
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5-4
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