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and the interface the monitored device is connected to Currently the only protocol supported for testing is ICMP (ipIcmpEcho) The timeout command specifies the number of milliseconds to wait for the echo reply The frequency command specifies the number of echo replies that must be missed before the tracked static route is considered bad The sla monitor schedule command specifies when monitoring should start and for how long Normally you want the tracking to start right now and continue forever, but you can change these values The track command associates the SLA_ID for monitoring with the tracking ID specified in the route command(s) Static Route Tracking Configuration Example To illustrate how static route tracking is used, examine Figure 4-2 In this example, the perimeter appliance is connected to two ISPs via two different perimeter routers, where ISP1 is the default path and ISP2 is the backup However, if either of these two ISP links were to go down, the appliance, since it is not connected to them, would not know this Here is the configuration for static route tracking for this example:

Nonrecursive Datalog expressions without arithmetic operations are equivalent in expressive power to expressions using the basic operations in relational algebra ( , , , , and ) We shall not formally prove this assertion here Rather, we shall show through examples how the various relational-algebra operations can be expressed in Datalog In all cases, we de ne a view relation called query to illustrate the operations

ciscoasa(config)# sla monitor 100 ciscoasa(config-sla-monitor)# type echo protocol ipIcmpEcho 200111 interface outside ciscoasa(config-sla-monitor-echo)# timeout 1000 ciscoasa(config-sla-monitor-echo)# frequency 3 ciscoasa(config-sla-monitor-echo)# exit ciscoasa(config)# sla monitor schedule 100 life forever start-time now ciscoasa(config)# track 1 rtr 100 reachability ciscoasa(config)# route 0 0 outside1 19216811 1 track 1 ciscoasa(config)# route 0 0 outside2 19216821 2 track 1

The McGraw Hill Companies, 2001

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In the preceding configuration, the appliance is tracking a device, probably a router, in the ISP1 network (200111) If an echo reply is not received when tracking within 1 second (1,000 milliseconds) and this process is repeated three times, the primary default

We have already seen how to do selection by using Datalog rules We perform projections simply by using only the required attributes in the head of the rule To project attribute account-name from account, we use query(A) : account(A, N , B) We can obtain the Cartesian product of two relations r1 and r2 in Datalog as follows: query(X1 , X2 , , Xn , Y1 , Y2 , , Ym ) : r1 (X1 , X2 , , Xn ), r2 (Y1 , Y2 , , Ym ) where r1 is of arity n, and r2 is of arity m, and the X1 , X2 , , Xn , Y1 , Y2 , , Ym are all distinct variable names We form the union of two relations r1 and r2 (both of arity n) in this way: query(X1 , X2 , , Xn ) : r1 (X1 , X2 , , Xn ) query(X1 , X2 , , Xn ) : r2 (X1 , X2 , , Xn ) We form the set difference of two relations r1 and r2 in this way: query(X1 , X2 , , Xn ) : r1 (X1 , X2 , , Xn ), not r2 (X1 , X2 , , Xn ) Finally, we note that with the positional notation used in Datalog, the renaming operator is not needed A relation can occur more than once in the rule body, but instead of renaming to give distinct names to the relation occurrences, we can use different variable names in the different occurrences It is possible to show that we can express any nonrecursive Datalog query without arithmetic by using the relational-algebra operations We leave this demonstration as an exercise for you to carry out You can thus establish the equivalence of the basic operations of relational algebra and nonrecursive Datalog without arithmetic operations Certain extensions to Datalog support the extended relational update operations of insertion, deletion, and update The syntax for such operations varies from implementation to implementation Some systems allow the use of + or in rule heads to denote relational insertion and deletion For example, we can move all accounts at the Perryridge branch to the Johnstown branch by executing + account(A, Johnstown , B) : account(A, Perryridge , B) account(A, Perryridge , B) : account(A, Perryridge , B) Some implementations of Datalog also support the aggregation operation of extended relational algebra Again, there is no standard syntax for this operation.

ISP1 (200111)

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