HP 7500 series Configuration Manual page 48

CAUTION:
If the intermediate switch is in an IRF fabric, you must assign this fabric a different domain ID than the
LACP MAD-enabled IRF fabric.
# Create a dynamic aggregate interface.
<Sysname> system-view
[Sysname] interface bridge-aggregation 2
[Sysname-Bridge-Aggregation2] link-aggregation mode dynamic
[Sysname-Bridge-Aggregation2] quit
# Assign ports GigabitEthernet 4/0/1, GigabitEthernet 4/0/2, GigabitEthernet 4/0/3, and
GigabitEthernet 4/0/4 to the aggregate interface.
[Sysname] interface gigabitethernet 4/0/1
[Sysname-GigabitEthernet4/0/1] port link-aggregation group 2
[Sysname-GigabitEthernet4/0/1] quit
[Sysname] interface gigabitethernet 4/0/2
[Sysname-GigabitEthernet4/0/2] port link-aggregation group 2
[Sysname-GigabitEthernet4/0/2] quit
[Sysname] interface gigabitethernet 4/0/3
[Sysname-GigabitEthernet4/0/3] port link-aggregation group 2
[Sysname-GigabitEthernet4/0/3] quit
[Sysname] interface gigabitethernet 4/0/4
[Sysname-GigabitEthernet4/0/4] port link-aggregation group 2
[Sysname-GigabitEthernet4/0/4] quit
IRF split detection and recovery with LACP MAD:
7.
A ring-topology IRF fabric changes to a daisy chain topology when one IRF link fails, and splits
when two IRF links fail.
If both the IRF link between Device A and Device B and the IRF link between Device C and Device
D fail, the IRF fabric splits into two IRF fabrics: IRF 1, which comprises Device A and Device C, and
IRF 2, which comprises Device B and Device D.
When the split is detected, the system outputs IRF link state and card failure error messages. The
following is the sample error messages for IRF 1:
#May 7 09:13:42:388 2010 STM/4/LINK STATUS CHANGE:
#May 7 09:13:42:720 2010 DEVM/1/BOARD STATE CHANGES TO FAILURE:
In addition, because the master in IRF 2 has a higher member ID than the master in IRF 1, the MAD
mechanism places IRF 2 in Recovery state and shuts down all its ports except for those excluded
from the shutdown action.
# If IRF 1 fails before the IRF links are recovered, log in to the console port of Device B or Device
D and use the mad restore command to restore IRF 2 to the Active state and bring up all ports that
have been shut down by MAD.
<Sysname> system-view
[Sysname] mad restore
This command will restore the device from multi-active conflict state. Continue?
[Y/N]:y
Restoring from multi-active conflict state, please wait...
[Sysname]
#May 7 09:23:16:050 2010 IFNET/4/INTERFACE UPDOWN:
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