Default & Static Route Configuration With Next Hop Address in Packet Tracer

Specifying valid next-hop and default-nexthop addresses PBR supports all types of directly connected hosts as nexthop or default-nexthop actions. PBR also supports recursive nexthops, however only for remote hosts that are learned over a VXLAN L3VNI tunne

Next-Hop: The IP address of the next device to which a data packet is forwarded. Routing: The process of determining the path for packet delivery between networks.

当设备通过EBGP邻居学到路由再转发给其他IBGP邻居时，默认不修改下一跳，但其EBGP邻居发来的路由的下一跳都是其EBGP邻居的Peer地址，本端对等体所属AS域内的IBGP邻居收到这样的路由后，由于下一跳不可达导致路由无法活跃。 因此，需要在ASBR上修改EBGP邻居发来的路由的Next_Hop，改变下一跳地址，使得发给IBGP邻居的路由的下一跳是其自身的地址，IBGP邻居收到这样的路由后（由于域内都配置了IGP）发现下一跳可达，路由即为活跃路由。 缺省情况下，向IBGP对等体发布路由时，不修改下一跳

本文說明如何使用set ip default next-hop和set ip next-hop命令來配置基於策略的路由 (PBR)。

This document describes static routes and uses a problem scenario to demonstrate when it is desirable to specify how to reach the next hop IP address.

When a VLAN gets its IP address via DHCP and the VLAN interface determines the default gateway, the IP address of the gateway is used as the next hop IP address.