prefix length

EIGRP advertises a prefix length for each destination network.

Prefix Length:前缀长度，mask长度，即子网掩码为1的位数。

Sample：

ip address 172.16.1.1 255.255.255.0

it will advertise 172.16.1.0 with a prefix length of 24.

Likewise, if the router is configured as follows:

ip address 172.16.250.1 255.255.255.252

it will advertise 172.16.250.0 with a prefix length of 30.

本文转simmy51CTO博客，原文链接：http://blog.51cto.com/helpdesk/161851，如需转载请自行联系原作者