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...
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...
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...
# 使能DHCP Snooping功能,并将连接DHCP Server的10GE1/0/4接口配置为信任接口。 [DeviceA] dhcp enable [DeviceA] dhcp snooping enable [DeviceA] vlan 10 [DeviceA-vlan10] dhcp snooping enable [DeviceA-vlan10] quit [DeviceA] interface 10GE 1/0/4 [DeviceA-10GE1/0/4] dhcp snooping trusted [...
dhcp snooping trusted interface interface-type interface-number 缺省情况下,接口为非信任状态。 检查配置结果 执行命令display arp anti-attack statistics check user-bind [ vlan [ vlan-id ] | interface [ interface-type interface-number ] | bridge-domain [ bd-id ] ],查看接口、VLAN或BD视图下因不...
DhcpOptions Dimension Direction EffectiveNetworkSecurityGroup EffectiveNetworkSecurityGroupAssociation EffectiveNetworkSecurityRule EffectiveRoute EffectiveRouteSource EffectiveRouteState EffectiveSecurityRuleProtocol Error ErrorDetails ErrorException ErrorResponse ErrorResponseException EvaluatedNetworkSecurityGroup ...
DhcpOptions DhGroup 维度 方向 DnsNameAvailabilityResult DnsSettings DscpConfiguration EffectiveBaseSecurityAdminRule EffectiveConnectivityConfiguration EffectiveDefaultSecurityAdminRule EffectiveNetworkSecurityGroup EffectiveNetworkSecurityGroupAssociation EffectiveNetworkSecurityGroupListResult EffectiveNetworkSecurityRul...
323 ▼ How to Unconfigure a DHCP Server or a BOOTP Relay Agent (DHCP Manager) ... 324 Configuring and Unconfiguring a DHCP Server Using dhcpconfig Commands ... 324 ▼ How to Configure a DHCP Server (dhcpconfig -D) ... 324 ▼ How to Configure a BOOTP Relay Agent (dhcpconfig -R )...
DHCP clients use User Datagram Protocol (UDP) broadcasts to send DHCPDISCOVER messages when they lack information about the network to which they belong. If a client is on a network segment that does not include a server, a relay agent is needed on that...