The nexthop recursive-lookup delay command configures the delay in responding to changes of the next hop.
The undo nexthop recursive-lookup delay command restores the default setting.
By default, the delay in responding to changes of the next hop is not configured.
| Parameter | Description | Value |
|---|---|---|
| delay-time | Specifies the delay in responding to changes of the next hop. | The value is an integer that ranges from 1 to 100, in seconds. The default value is 5 seconds. |
BGP view, BGP-IPv4 unicast address family view, BGP-VPN instance IPv4 address family view, BGP-VPNv4 address family view, BGP-IPv6 unicast address family view, BGP-VPN instance IPv6 address family view, BGP-VPNv6 address family view, BGP-IPv4 multicast address family view
Usage Scenario
When the route path on the upstream of a PE connected to an RR changes, if the PE detects that the iterated next hop becomes unreachable before the RR instructs the PE to switch the route, the PE withdraws the original optimal route advertised to its connected CE. After the RR re-advertises the switched route to the PE, the PE re-advertises an optimal route to the CE after route selection. During the route switchover, a huge volume of traffic will be dropped. If the nexthop recursive-lookup delay command is run on the PE to delay responding to the next hop unreachable event and to respond to this event only after the RR advertises the switched route, the volume of lost traffic will be reduced during route switchover.