Section 8 : Feature
8.1 VRRP
interface g0/0/1 #默认优先级是100，track默认减少10
vrrp vrid 125 virtual-ip 10.1.15.254
vrrp vrid 125 priority 115
vrrp vrid 125 authentication-mode md5 HWvrrp
vrrp vrid 125 preempt-mode timer delay 20
vrrp vrid 125 track interface s2/0/0
vrrp vrid 125 track interface s2/0/0
interface g0/0/1
vrrp vrid 125 virtual-ip 10.1.15.254
vrrp vrid 125 authentication-mode md5 HWvrrp
8.2 DHCP
dhcp enable #R4是DHCP服务器
ip pool pool_24
gateway-list 10.1.24.254
dns-list 10.1.30.20
network 10.1.24.0 mask 24
excluded-ip-address 10.1.24.1 10.1.24.20
lease day 2 hour 0 minute 0
interface g0/0/0 #配置好地址池后，接口上要选择全局地址池
dhcp select global
dhcp enable #SW4上全局开启dhcp和dhcp snooping功能
dhcp snooping enable
vlan 24 #vlan24下开启dhcp snooping功能并添加信任接口
dhcp snooping enable
dhcp snooping trusted interface g0/0/4
8.3 NTP
ntp-service authentication enable #R1是NTP服务器
ntp-service authentication-keyid 1 authentication-mode md5 HWNTP
ntp-service reliable authentication-keyid 1
ntp-service refclock-master 3
interface g0/0/1
ntp-service broadcast-server authentication-keyid 1
ntp-service authentication enable #SW3和R5是NTP客户端
ntp-service authentication-keyid 1 authentication-mode md5 HWNTP
ntp-service reliable authentication-keyid 1
Interface vlanif15
ntp-service broadcast-client
dis ntp status #检查配置效果
原文：http://www.cnblogs.com/xuebing666666/p/6672678.html