关于GRE OVER IPSEC 引起的recursive routing

今天做实验碰到一个很有意思的话题，递归路由。虽然gre over ipsec 配好了 但路由接口来回down掉，*Mar 4 15:08:34.435: %OSPF-5-ADJCHG: Process 10, Nbr 4.4.4.4 on Tunnel0 from LOADING to FULL, Loading Done*Mar 4 15:08:42.003: %TUN-5-RECURDOWN: Tunnel0 temporarily disabled due to recursive routing*Mar 4 15:08:43.003: %LINEPROTO-..