3Com S7902E, Руководство по настройке

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If a master leaves an IRF to join another IRF or to operate independently and the IRF is configured
to preserve the bridge MAC address permanently, bridge MAC address collision occurs and thus
causes network communication problem.
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If the master leaves the IRF because of reboot or link failure and the IRF is configured to change
the IRF bridge MAC address as soon as the master leaves, the unnecessary switch of bridge MAC
address occurs and thus causes flow interruption.
Therefore, configure the preservation time of IRF bridge MAC address according to your network
status:
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Preserve for six minutes: After the master leaves, the bridge MAC address will not change within
six minutes. If the master does not come back after six minutes, the IRF system will use the bridge
MAC address of the newly elected master as that of the IRF.
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Preserve permanently: No matter whether the master leaves the IRF or not, the IRF bridge MAC
address remains unchanged.
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Not preserved: As soon as the master leaves, the system will use the bridge MAC address of the
newly elected master as that of the IRF.
Follow these steps to specify preservation time of IRF bridge MAC address:
To do… Use the command… Remarks
Enter system view system-view —
Configure the IRF bridge MAC
address to be preserved
permanently after the master
leaves
irf mac-address persistent
always
Specify the preservation time
of the IRF bridge MAC
address as 6 minutes after the
master leaves
irf mac-address persistent timer
Configure that the IRF bridge
MAC address changes as
soon as the master leaves
undo irf mac-address persistent
Optional
By default, IRF bridge MAC
address is preserved
permanently.
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The change of the bridge MAC address may cause a temporary flow interruption.
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If the device receives hello packets with a bridge MAC address the same as that of its own, it
cannot form an IRF with the peer device. The reason may be: After configuring the IRF bridge MAC
address to be preserved permanently after the master leaves, you remove an SRPU of the device
to another device, and use this device to form an IRF with the local device. In this case, because
the removed SRPU still uses the original bridge MAC address to send hello packets, the IRF may
not be able to be established.
Setting the Delay Time for the Link Layer to Report a Link-Down Event
During the suppression time, the system cannot be aware of the switch between IRF link states; after
the suppression time, the link layer reports the link state changes to the system, and then the system