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Each site has its own local transaction manager, whose function is to ensure the ACID properties of those transactions that execute at that site The various transaction managers cooperate to execute global transactions To understand how such a manager can be implemented, consider an abstract model of a transaction system, in which each site contains two subsystems: The transaction manager manages the execution of those transactions (or subtransactions) that access data stored in a local site Note that each such transaction may be either a local transaction (that is, a transaction that executes at only that site) or part of a global transaction (that is, a transaction that executes at several sites) The transaction coordinator coordinates the execution of the various transactions (both local and global) initiated at that site The overall system architecture appears in Figure 191

ciscoasa(config)# interface physical_if_name ciscoasa(config-if)# ipv6 nd dad attempts #_of_attempts ciscoasa(config-if)# ipv6 nd ns-interval #_of_milliseconds

Figure 6-18 (Continued)

The McGraw Hill Companies, 2001

The number of attempts can be 0 to 600 in the ipv6 nd dad attempts command; setting it to 0 disables duplicate address detection on the specified interface The ipv6 nd nsinterval command specifies the interval in which the duplicate address probes are generated by default this is 1,000 milliseconds if omitted This value can range from 1,000 to 3,600,000 milliseconds NOTE The ipv6 nd ns-interval command changes the interval for not just duplicate address checks, but for all neighbor solicitation messages on the interface

The structure of a transaction manager is similar in many respects to the structure of a centralized system Each transaction manager is responsible for Maintaining a log for recovery purposes Participating in an appropriate concurrency-control scheme to coordinate the concurrent execution of the transactions executing at that site As we shall see, we need to modify both the recovery and concurrency schemes to accommodate the distribution of transactions The transaction coordinator subsystem is not needed in the centralized environment, since a transaction accesses data at only a single site A transaction coordinator, as its name implies, is responsible for coordinating the execution of all the transactions initiated at that site For each such transaction, the coordinator is responsible for Starting the execution of the transaction Breaking the transaction into a number of subtransactions and distributing these subtransactions to the appropriate sites for execution Coordinating the termination of the transaction, which may result in the transaction being committed at all sites or aborted at all sites

The default policy, global_policy (discussed previously in the Default Layer 3/4 Policy Map section), has already been activated globally You can verify this with the show run command:

A distributed system may suffer from the same types of failure that a centralized system does (for example, software errors, hardware errors, or disk crashes) There are, however, additional types of failure with which we need to deal in a distributed environment The basic failure types are Failure of a site Loss of messages Failure of a communication link Network partition The loss or corruption of messages is always a possibility in a distributed system The system uses transmission-control protocols, such as TCP/IP, to handle such errors Information about such protocols may be found in standard textbooks on networking (see the bibliographical notes) However, if two sites A and B are not directly connected, messages from one to the other must be routed through a sequence of communication links If a communication link fails, messages that would have been transmitted across the link must be rerouted In some cases, it is possible to nd another route through the network, so that the messages are able to reach their destination In other cases, a failure may result in there being no connection between some pairs of sites A system is partitioned

Only one policy map can be activated globally; however, you can add to, change, or remove the default policies Likewise, you can only have one layer 3/4 policy map applied to an interface However, this can include all the policies you need (class maps, and so on) to affect traffic on the specified interface

.

To verify that your policies are being enforced, use the show service-policy command: