Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 185
Command example, Command Syntax, Command Mode
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• denial of service-an attacker can send fraudulent ARP messages to a client to associate a false MAC address with the gateway address, which blackholes all internet-bound packets from the client. Note: Dynamic ARP inspection (DAI) uses entries in the L2SysFlow CAM region, a sub-region of SystemFlow. One CAM entry is required for every DAI-enabled VLAN. You can enable DAI on up to 16 VLANs on a system. You can configure 10 to 16 DAI-enabled VLANs by allocating more CAM space to the L2SysFlow region before enabling DAI. Note: SystemFlow has 102 entries by default. This region is comprised of two sub-regions: L2Protocol and L2SystemFlow. L2Protocol has 87 entries; L2SystemFlow has 15 entries. Six L2SystemFlow entries are used by Layer 2 protocols, leaving 9 for DAI. L2Protocol can have a maximum of 100 entries. This region must be expanded to capacity before you can increase the size of L2SystemFlow. This is relevant when you are enabling DAI on VLANs. If, for example, you want to enable DAI on 16 VLANs, you need seven more entries; in this case, reconfigure the SystemFlow region for 122 entries: layer-2 eg-acl value fib value frrp value ing-acl value learn value l2pt value qos value system-flow 122 Note: The logic is as follows: L2Protocol has 87 entries by default and must be expanded to its maximum capacity, 100 entries, before L2SystemFlow can be increased; therefore 13 more L2Protocol entries are required. L2SystemFlow has 15 entries by default, but only nine are for DAI; to enable DAI on 16 VLANs, seven more entries are required: 87 L2Protocol + 13 additional L2Protocol + 15 L2SystemFlow + 7 additional L2SystemFlow equals 122. Step 1 2 Task Enable DHCP snooping. Validate ARP frames against the DHCP snooping binding table. Command Syntax Command Mode arp inspection INTERFACE VLAN Note: Dynamic ARP Inspection (DAI) may sometimes filter ARP traffic from valid clients in the DHCP snooping binding table. To view the number of entries in the ARP database, use the show arp inspection database command (Figure 9-12). Figure 9-12. Command example: show arp inspection database FTOS#show arp inspection database Protocol Address Age(min) Hardware Address Interface VLAN CPU Internet 10.1.1.251 - 00:00:4d:57:f2:50 Te 0/2 Vl 10 CP Internet 10.1.1.252 - 00:00:4d:57:e6:f6 Te 0/1 Vl 10 CP Internet 10.1.1.253 - 00:00:4d:57:f8:e8 Te 0/3 Vl 10 CP Internet 10.1.1.254 - 00:00:4d:69:e8:f2 Te 0/50 Vl 10 CP FTOS# Dynamic Host Configuration Protocol (DHCP) | 183
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