Dell N3200-ON Networking N-Series Switches User Guide version 6.8.0 - Page 678

Table 19-4. Common IP Protocol Numbers (Continued) IP Protocol Number 0x02 0x06 0x08 0x09 0x11 Protocol IGMP TCP EGP IGP UDP Using IP and MAC Address Masks Masks are used with IP and MAC addresses to specify what should be considered in the address for a match. Masks are expanded internally into a bit mask and are applied bit-wise in the hardware even though they are entered in decimal or hexadecimal format. Masks need not have contiguous 0 or 1 bits. A 0 bit value in the mask indicates that the address field in the packet being compared must match the address bit exactly. A 1 value in the mask indicates a wildcard or don't care value, i.e. the access bits are not compared and match any possible value. For example, an IP address of 3.3.3.3 with a mask of 0.0.0.0 indicates that the ACL matches on all four bytes of the IP address. Likewise, a MAC address of 68:94:23:AD:F3:18 with a mask of 00:00:00:00:00:ff indicates that the first five bytes must match (e.g., 68:94:23:AD:F3) and the last byte may take on any value from 0x00 to 0xff (0-255) and still be considered a match. The following ACL equivalents are noted: Address 0.0.0.0 x.x.x.x 00:00:00:00:00:00 Mask 255.255.255.255 host ff:ff:ff:ff:ff:ff Equivalent Address any x.x.x.x any 678 Access Control Lists