Hitachi US7070447-001 manual Other IP-related Services, RIP Routing Information Protocol

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HiSpeed Switch Troubleshooting Guide

Other IP-related Services

The HiSpeed switch supports the following IP-related functions:

❒Address Resolution Protocol (ARP)

Used to resolve an IP to MAC address allowing devices to communicate at the Data Link layer. The HiSpeed switch maintains an ARP table of IP to MAC address mappings.

❒Internet Control Message Protocol (ICMP)

Provides a mechanism allowing a device to report an error back to the original source. Ping packets which employ ICMP, are used to determine whether a device is reachable across the network.

❒TCP (Transmission Control Protocol)

Used by applications requiring a reliable transport mechanism for communicating between devices across the network. Examples of network applications using TCP are: Telnet, FTP, SMTP.

❒UDP (User Datagram Protocol)

Used by applications that do not require a reliable transport mechanism for communicating between devices across the network. Examples of network applications using UDP are: DNS, TFTP, SNMP.

RIP (Routing Information Protocol)

The HiSpeed switch uses RIP, version 1, to route IP packets across VLANs. RIP, a distance vector protocol, computes the best path to the destination based on the least number of hops. If more than one path exists with the same metric, the switch will choose whichever path it first learns.

An internal Routing table based on network address, gateway, metric, VLAN, and Interface type is built and maintained on the HiSpeed switch. These routes are propagated across the network via RIP every 30 seconds. Without RIP updates, dynamic routes age out after 180 seconds. The maximum number of RIP entries supported on the HiSpeed switch is 512.

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