Brocade Communications Systems ICX 7250 series, Руководство по настройке

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LSA syncing and packing
When the LSA processing is completed on the active management module and the decision is made to install the LSA in its link state
database (LSDB), OSPF synchronizes that LSA to the standby module. OSPF checks the current state of the database entry, whether or
not it is marked for deletion. After checking the database state, OSPF packs the LSA status and other necessary information needed for
direct installation in the standby OSPF LSDB, along with the LSA portion. When the LSA reaches the standby module, OSPF checks the
database entry state in the buffer and takes appropriate action, such as adding, overwriting, updating, or deleting the LSA from the LSDB.
Neighbor device synchronization
When the neighbor device is added in the active management module, it is synchronized and added to the standby module. When the
neighbor is deleted in the active module, it is synchronized to the standby module and deleted in the standby module. When the
neighbor device state becomes 2way or full, the neighbor device is synchronized to the standby module. The following attributes of the
neighbor device are synchronized to the standby module:
• Neighbor device ID
• Neighbor device IP address
• Destination device or backup destination device information
• Neighbor state 2way or full
• MD5 information
• Neighbor priority
Synchronization limitations
• If a neighbor device is inactive for 30 seconds, and if the standby module takes over in another 10 seconds, the neighbor
device cannot be dropped. The inactivity timer starts again and takes another 40 seconds to drop the neighbor device.
• In standby module, the valid neighbor states are loading, down, 2way, and full. If the active management processor (MP) fails
when the neighbor state is loading, the standby module cannot continue from loading, but the standby can continue from 2way
and tries to establish adjacency between the neighboring devices.
• The minimum OSPF dead-interval timer value is 40 seconds. When the dead-interval value is configured to less than this
minimum value, OSPF NSR cannot be supported.
Interface synchronization
Interface information is synchronized for interfaces such as PTPT, broadcast, and non-broadcast. Interface wait time is not synchronized
to the standby module. If an interface waits for 30 seconds to determine the identity of the designated router (DR) or the backup
designated router (BDR), and if the standby module takes over, the wait timer starts again and takes another 40 seconds for the interface
state to change from waiting to BDR, DR, or DROther.
Standby module operations
The standby management module with OSPF configuration performs the following functions.
Standby module operations
Brocade FastIron Layer 3 Routing Configuration Guide
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