Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 81

Configure Filters with a Sequence Number To create a filter for packets with a specified sequence number, follow these steps, starting in CONFIGURATION mode: Step Command Syntax Command Mode Purpose 1 ip access-list extended access-list-name CONFIGURATION Enter the IP ACCESS LIST mode by creating an extended IP ACL. 2 seq sequence-number {deny | permit} CONFIG-EXT-NACL Configure a drop or forward filter. {ip-protocol-number | icmp | ip | tcp | udp} {source mask | any | host ip-address} {destination mask | any | host ip-address} [operator port [port]] [count [byte]] [order] [fragments] When you create the filters with a specific sequence number, you can create the filters in any order and the filters are placed in the correct order. Note: When assigning sequence numbers to filters, you might need to insert a new filter. To prevent reconfiguring multiple filters, assign sequence numbers in multiples of five or another number. Figure 5-10 shows how the seq command orders the filters according to the sequence number assigned. In the example, filter 15 was configured before filter 5, but the show config command displays the filters in the correct order. Figure 5-10. Command Example: seq FTOS(conf-ext-nacl)#seq 15 deny ip host 112.45.0.0 any FTOS(conf-ext-nacl)#seq 5 permit tcp 12.1.3.45 0.0.255.255 any FTOS(conf-ext-nacl)#show config ! ip access-list extended dilling seq 5 permit tcp 12.1.0.0 0.0.255.255 any seq 15 deny ip host 112.45.0.0 any FTOS(conf-ext-nacl)# Configure Filters Without a Sequence Number If you are creating an extended ACL with only one or two filters, you can let FTOS assign a sequence number based on the order in which the filters are configured. FTOS assigns filters in multiples of 5. Access Control Lists (ACLs) | 79