Dell PowerConnect 5548 User Guide - Page 106

The currently-defined rules for the selected ACL are displayed. 2 To add a rule, click Add ACE. 3 Select a user-defined ACL, and enter the following fields: - New ACE Priority (1-2147483647) -Enter the priority of the ACE. ACEs with higher priority are processed first. One is the highest priority. - Protocol Select From List - Select to create an ACE, based on a specific protocol. The following options are available: • ICMP - Internet Control Message Protocol (ICMP). The ICMP enables the gateway or destination host to communicate with the source host, for example, to report a processing error. • IGMP - Internet Group Management Protocol (IGMP). Enables hosts to notify their local switch or router that they want to receive transmissions assigned to a specific multicast group. • IPinIP - IP in IP. Encapsulates IP packets to create tunnels between two routers. This ensures that IPIP tunnel appears as a single interface, rather than several separate interfaces. IPIP enables tunnel intranets occur the internet, and provides an alternative to source routing. • TCP - Transmission Control Protocol (TCP). Enables two hosts to communicate and exchange data streams. TCP guarantees packet delivery, and guarantees that packets are transmitted and received in the order they are sent. • EGP - Exterior Gateway Protocol (EGP). Permits exchanging routing information between two neighboring gateway hosts in an autonomous systems network. • IGP - Interior Gateway Protocol (IGP). Enables for routing information exchange between gateways in an autonomous network. • UDP - User Datagram Protocol (UDP). Communication protocol that transmits packets but does not guarantee their delivery. 106 Dell PowerConnect 55xx Systems User Guide