Operation Manual – VRRPH3C S9500 Series Routing Switches Chapter 1 VRRP Configuration1-6The delay in seconds ranges from 0 to 255. By default, the preemption mode is enabledwith a delay of 0 seconds.Note:If preemption mode is disabled, the delay will automatically become 0 seconds.1.2.7 Configuring Authentication Type and Authentication KeyVRRP provides following authentication types:z simple: Simple character authenticationz md5: MD5 authenticationIn a network under possible security threats, the authentication type can be set tosimple. Then the switch will add the authentication key into the VRRP packets beforetransmitting it. The receiver will compare the authentication key of the packet with thelocally configured one. If they are the same, the packet will be taken as a true and legalone. Otherwise it will be regarded as an illegal packet and discarded. In this case, anauthentication key not exceeding 8 characters should be configured.In a totally unsafe network, the authentication type can be set to md5. The switch willuse the authentication type and MD5 algorithm provided by the Authentication Headerto authenticate the VRRP packets. In this case an authentication key not exceeding 8characters should be configured.Those packets failing to pass the authentication will be discarded and a trap packet willbe sent to the network management system.Perform the following configuration in VLAN interface view to configure authenticationtype and authentication key:To do… Use the command…Configure authentication type andauthentication keyvrrp vrid virtual-router-idauthentication-mode { md5 | simple } keyRemove the authentication typeand authentication keyundo vrrp vrid virtual-router-idauthentication-modeBy default, no authentication is performed.
