Planning The Cable Connection Scheme; Configuring The M-Lag System Settings - H3C S6850-56HF-IM Manual

Keepalive link
The M-LAG member devices exchange keepalive packets over the keepalive link to detect
multi-active collisions when the peer link is down.
As a best practice, establish a dedicated direct link between two M-LAG member devices as a
keepalive link. Do not use the keepalive link for any other purposes. Make sure the M-LAG member
devices have Layer 2 and Layer 3 connectivity to each other over the keepalive link.
You can use management Ethernet interfaces, Layer 3 Ethernet interfaces, Layer 3 aggregate
interfaces, or interfaces with a VPN instance bound to set up the keepalive link.
As a best practice, do not use VLAN interfaces for keepalive link setup. If you have to use VLAN
interfaces, remove the peer-link interfaces from the related VLANs to avoid loops.

Planning the cable connection scheme

Select cables or transceiver modules and optical fibers matching the rate of physical ports of the
peer link and the keepalive link for connection.
Cables are short but with high performance and stability, suitable for short-distance connections in
the equipment room. Transceiver modules and optical fibers can be combined flexibly and is suitable
for longer distance connections.
For information about the transceiver modules and cables supported by the switch, see H3C
S6850-56HF-IM Immersion-Cooled Switch Hardware Information and Specifications.
This following section describes several cable connection schemes that use 100G physical ports for
the peer link connection and 25G physical ports for the keepalive link connection, with matching
cables or transceiver module and optical fibers.
NOTE:
The physical port locations in the following figures are for illustration only.
Figure5-2 Connecting two M-LAG member devices
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2
Figure5-3 Connection topology of two M-LAG member devices
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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.
Keepalive
Peer-link
5-3
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