H3C S12500X-AF Series, Configuration Examples, Page: 6 / 21

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Table 2 VLAN and IP address assignment
Device VLAN interface IP address
Router A :
VLAN-interface 30 172.24.2.2/24
VLAN-interface 40 172.24.40.2/24
VLAN-interface 50 172.24.1.2/24
Router B
:
VLAN-interface 30 172.24.2.3/24
VLAN-interface 41 172.24.41.3/24
VLAN-interface 50 172.24.4.2/24
IRF fabric :
VLAN-interface 10 172.24.10.254/24
VLAN-interface 20 172.24.20.254/24
VLAN-interface 40 172.24.40.254/24
VLAN-interface 41 172.24.41.254/24
Analysis
To avoid single points of failure, use multichassis link aggregations to connect the IRF fabric to the
downstream and upstream devices.
For LACP MAD to run correctly, you must make sure the intermediate device supports extended
LACPDUs for LACP MAD. In this example, SW 1 is used as the intermediate device for LACP MAD.
You do not need to run LACP MAD on all link aggregations. You can detect IRF split effectively by
running LACP MAD on one dynamic link aggregation.
Software versions used
Table 3 shows the software versions used in this configuration example.
Table 3 Product and software version compatibility
Product Software version
S12500X-AF Switch Series S12500X-CMW710-R2712
S12500-X Switch Series S12500X-CMW710-R2712
S9800 Switch Series S9800-CMW710-R2712
Restrictions and guidelines
By default, interfaces on the devices are disabled (in ADM or Administratively Down state). To
have an interface operate, you must use the
undo shutdown
command to enable that interface.
When you configure LACP MAD on a link aggregation, follow these restrictions and guidelines: