Disabling ND Entry TimeoutWhen a peer system warmboots or performs an ISSU, the ND entries in the local system may time out resulting in traffic loss. You canconfigure the system to keep the learnt neighbor discovery entries stateless so that the ND entries do not time out. To configure thesystem to keep the learnt neighbor discovery entries stateless, follow these steps:• Disable the ND timer:INTERFACEipv6 nd disable-reachable-timer• To reenable the ND timer, use the no form of the command:INTERFACEno ipv6 nd disable-reachable-timerThe following example shows how to disable the ND timer.Dell(conf-if-fo-1/1/1)#ipv6 nd disable-reachable-timerConfiguring IPv6 RA GuardThe IPv6 Router Advertisement (RA) guard allows you to block or reject the unwanted router advertisement guard messages that arrive atthe network device platform.To configure the IPv6 RA guard, perform the following steps:1 Configure the terminal to enter the Global Configuration mode.EXEC Privilege modeconfigure terminal2 Enable the IPv6 RA guard.CONFIGURATION modeipv6 nd ra-guard enable3 Create the policy.POLICY LIST CONFIGURATION modeipv6 nd ra-guard policy policy-name4 Define the role of the device attached to the port.POLICY LIST CONFIGURATION modedevice-role {host | router}Use the keyword host to set the device role as host.Use the keyword router to set the device role as router.5 Set the hop count limit.POLICY LIST CONFIGURATION modehop-limit {maximum | minimum limit}The hop limit range is from 0 to 254.6 Set the managed address configuration flag.POLICY LIST CONFIGURATION mode446 IPv6 Routing
