思科service udp-small-servers含义


service udp-small-servers
To access minor User Datagram Protocol (UDP) services available from hosts on the network, use the service udp-small-servers command. Use the no form of the command to disable these services.

service udp-small-servers
no service udp-small-servers

Syntax Description
This command has no arguments or keywords.

Default
Enabled

Command Mode
Global configuration

Usage Guidelines
This command first appeared in Cisco IOS Release 11.2.

By default the UPD servers for Echo, Discard, and Chargen services are enabled.

When you disable the servers, access to Echo, Discard, and Chargen ports causes the Cisco IOS software to send an "ICMP port unreachable" message to the sender and discard the original incoming packet
这是CISCO的解释,可是看过之后还是不怎么懂,请帮忙解释一下,类似的还有service tcp-small-servers这个命令

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