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26 Intel® NetStructure™ ZT 8101 10/100 Ethernet Switch User’s Manual
Switch Management and Operating Concepts
BOOTP/DHCP Relay
BOOTP and DHCP allow stations to obtain boot and TCP/IP information dynamically. The relay
agent allows them to obtain this information when the BOOTP/DHCP server is not on the same IP
interface as the end station. You can configure the switch so that the messages are forwarded from
one interface to the appropriate server on another interface.
DNS Relay
The Domain Name System (DNS) is used to map names to IP addresses. DNS relay enables the
switch to act as a DNS cache or proxy. It forwards DNS requests to DNS servers only if it can’t
resolve the name from its cache.
If you enable DNS relay on the switch, you can specify a primary and secondary DNS server to
forward requests that the switch cannot resolve. You can also specify that requests destined for
specific DNS servers should be first serviced by looking in the switch’s table.
Packet Forwarding
The switch maintains a forwarding table. This table contains the relationship between a destination
MAC or IP address and the Ethernet port or gateway router the destination resides on. This
information is used to forward packets. This reduces the traffic congestion on the network, because
packets, instead of being transmitted to all ports, are transmitted to the destination port only. For
example, if Port 1 receives a packet destined for a station on Port 2, the switch transmits that packet
through Port 2 only, and transmits nothing through the other ports. This process is referred to as
“learning” the network topology.
Management Login failed for user Edward through Console
Management Successful login through Telnet (Username: Edward)
Management Telnet session timeout (Username: Edward)
Management Login failed for user Edward through telnet
Management Configuration saved to flash (Username: Edward)
Management Upgrade firmware successfully (Username: Edward)
Management Upgrade firmware unsuccessfully! (Username: Edward)
Management Download configuration successfully (Username: Edward)
Management Download configuration unsuccessfully! (Username: Edward)
Spanning Tree Topology Change
Spanning Tree New Root
Spanning Tree Spanning tree protocol is enabled
Spanning Tree Spanning tree protocol is disabled
Security Possible spoofing attack from 00-80-C8-11-22-33 port 1
SNMP Trap Events (Sheet 2 of 2)