ip dhcp relay information trusted 命令用于在Cisco设备上配置DHCP中继代理,以确保从DHCP服务器接收到的选项信息是“受信任的”。这意味着当DHCP中继代理将这些信息转发给客户端时,不会修改或过滤这些信息,而是原封不动地传递给客户端。 2. 网络场景 该命令通常在网络中存在DHCP中继代理(如路由器)和DHCP服务器时使用...
Cisco IOS里有一个命令,专门用来处理这类DHCP请求报文:ip dhcp relay information trusted(接口命令)或者ip dhcp relay information trust-all(全局命令,对所有路由器接口都有效);这两条命令的作用就是允许被插入了选项82信息,但其giaddr字段为0.0.0.0的DHCP请求报文通过。 II、如果交换机不插入选项82信息,即配置了...
---对于思科路由器作为DHCP服务器情况,因为它能识别82选项,当发现DHCP Discover包含82选项,而又不是由DHCP Relay发送过来的,不会给客户端分派IP地址,除非通过如下全局命令或接口命令信任82选项: R2(config)#ip dhcp relay information trust-all R2(config-if)#ip dhcp relay information trusted ---值得注意的是,...
On the other hand, the "ip dhcp relay information trusted" serves another purpose, by default Cisco Catalyst switches insert what is called options 82 (option 88) into the DHCP packets, but by default Cisco routers drop packets that carry this option, so in order for the router to be able...
On the other hand, the "ip dhcp relay information trusted" serves another purpose, by default Cisco Catalyst switches insert what is called options 82 (option 88) into the DHCP packets, but by default Cisco routers drop packets that carry this option, so in order for the router to be able...
2F-NEW-ACC-SW-1(config-if)#ip dhcp snooping trust 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 核心层需要如下配置:(否则客户端获取不到IP地址) 6S-CORE-SW-1(config)#interface vlan 24 6S-CORE-SW-1(config)# ip dhcp relay information trusted ...
ip dhcp relay information trusted ip address 192.168.3.1 255.255.255.0!ip forward-protocol nd!no ip http serverno ip http secure-server!S2交换机配置如下: HJSW#sh runBuilding configuration...Current configuration : 2836 bytes!! Last configuration change at 02:24:43 UTC Thu May 24 201...
L2- SW (config)#ip dhcp snoopingL2- SW (config)#ip dhcp snooping vlanXL2- SW (config)# no ip dhcp relay information trustedL2- SW (co 8、n fig)#i nt range fa/1 -48L2- SW (config-if)#no ip dhcp snooping trustL2- SW (config-if)# spanning-tree portfastL2- SW (config-if)#...
–ip dhcp relay information trustedinterface configuration command •Before configuring the DHCP snooping information option on your switch, be sure to configure the device that is acting as the DHCP server. For example, you must specify the IP addresses that the DHCP ...
show ip dhcp relay information trusted-sources DETAILED STEPS Command or ActionPurpose Step 1 enable Example: Router> enable Enables privileged EXEC mode. Enter your password if prompted. Step 2 configure terminal Example: Router# configure terminal Enters global confi...