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Let A be a weak entity set with attributes a1 , a2 , , am Let B be the strong entity set on which A depends Let the primary key of B consist of attributes b1 , b2 , , bn We represent the entity set A by a table called A with one column for each attribute of the set: {a1 , a2 , , am } {b1 , b2 , , bn } As an illustration, consider the entity set payment in the E-R diagram of Figure 216 This entity set has three attributes: payment-number, payment-date, and payment-amount The primary key of the loan entity set, on which payment depends, is loan-number Thus, we represent payment by a table with four columns labeled loan-number, paymentnumber, payment-date, and payment-amount, as in Figure 225

The main problem with local command authorization is scalability: if you have one appliance, you only have to create your user accounts and privilege commands once However, if you have 30 appliances, replicating this information and keeping it in synch would be difficult Given this scenario, I recommend that you centralize the administrator accounts

Let R be a relationship set, let a1 , a2 , , am be the set of attributes formed by the union of the primary keys of each of the entity sets participating in R, and let the descriptive attributes (if any) of R be b1 , b2 , , bn We represent this relationship set by a table called R with one column for each attribute of the set: {a1 , a2 , , am } {b1 , b2 , , bn } As an illustration, consider the relationship set borrower in the E-R diagram of Figure 28 This relationship set involves the following two entity sets: customer, with the primary key customer-id loan, with the primary key loan-number

26:

The McGraw Hill Companies, 2001

loan-number L-11 L-14 L-15 L-16 L-17 L-17 L-17 L-23 L-93 L-93

and the commands they can execute on an AAA server The one restriction, however, is that if you want to control what commands an administrator can execute, you must use the TACACS+ protocol, which reduces to less than a handful the number of products you can purchase I ve already discussed AAA and its configuration in 7 Here s an example that employs command authorization, where both the administrative accounts and command privileges are defined on an AAA server:

payment-date 7 June 2001 28 May 2001 23 May 2001 18 June 2001 10 May 2001 7 June 2001 17 June 2001 17 May 2001 3 June 2001 13 June 2001 The payment table

ciscoasa(config)# username backdoor password doorback privilege 15 ciscoasa(config)# aaa-server AAATAC protocol tacacs+ ciscoasa(config)# aaa-server AAATAC (inside) host 100111 key cisco123 ciscoasa(config)# aaa authentication serial console AAATAC LOCAL ciscoasa(config)# aaa authentication enable console AAATAC LOCAL ciscoasa(config)# aaa authentication ssh console AAATAC ciscoasa(config)# aaa authentication http console AAATAC ciscoasa(config)# aaa authorization command AAATAC LOCAL

Since the relationship set has no attributes, the borrower table has two columns, labeled customer-id and loan-number, as shown in Figure 226

Pay 0 $12,500 $25,500

One item to point out about the preceding configuration is that I created a backup level 15 account in case the AAA server is unreachable

A relationship set linking a weak entity set to the corresponding strong entity set is treated specially As we noted in Section 26, these relationships are many-to-one and have no descriptive attributes Furthermore, the primary key of a weak entity set includes the primary key of the strong entity set In the E-R diagram of Figure 216, the weak entity set payment is dependent on the strong entity set loan via the relationship set loan-payment The primary key of payment is {loan-number, payment-number}, and the primary key of loan is {loan-number} Since loan-payment has no descriptive attributes, the loan-payment table would have two columns, loan-number and paymentnumber The table for the entity set payment has four columns, loan-number, paymentnumber, payment-date, and payment-amount Every (loan-number, payment-number) combination in loan-payment would also be present in the payment table, and vice versa Thus, the loan-payment table is redundant In general, the table for the relationship set