我们有两台思科路由器1841和1941. 1841年不断产生关于其邻居1941年“保持时间到期”和“接口再见”。VPN IPSec协议似乎保持。 不幸的是，这个closures的路由器没有详细的syslog或一个非常大的日志字节大小。 这里是一个例子日志：
Nov 27 17:04:21.848 CST: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 0.0.0.1 (Tunnel0) is down: Interface Goodbye received Nov 27 17:04:25.000 CST: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 0.0.0.1 (Tunnel0) is up: new adjacency Nov 27 17:06:39.137 CST: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 0.0.0.1 (Tunnel0) is down: Interface Goodbye received Nov 27 17:06:39.161 CST: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 0.0.0.1 (Tunnel0) is up: new adjacency Nov 27 17:07:40.668 CST: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 0.0.0.1 (Tunnel0) is down: Interface Goodbye received Nov 27 17:07:44.243 CST: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 0.0.0.1 (Tunnel0) is up: new adjacency Nov 27 17:09:55.492 CST: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 0.0.0.1 (Tunnel0) is down: Interface Goodbye received Nov 27 17:09:58.888 CST: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 0.0.0.1 (Tunnel0) is up: new adjacency CISCO 1941 interface Tunnel0 description --[ DataCenter ]-- ip address 192.168.192.2 255.255.255.252 ip access-group tac-in in ip access-group test out no ip redirects ip tcp adjust-mss 1350 load-interval 30 keepalive 10 3 tunnel source 99.99.99.244 tunnel destination 99.99.99.96 ! interface Embedded-Service-Engine0/0 no ip address shutdown ! interface GigabitEthernet0/0 description --[ COMPANY WAN ] -- ip address 99.99.99.244 255.255.255.224 ip access-group COMPANYWAN in duplex auto speed auto crypto map CMap-HASH ! interface GigabitEthernet0/1 description --[ COMPANY LAN ] ip address 165.65.166.1 255.255.255.0 ip access-group tac in duplex auto speed auto ! ! router eigrp 100 network LIST OMITED redistribute static metric 50 1 1 1 1 no eigrp log-neighbor-changes ! CISCO 1841 ! interface Tunnel0 ip address 192.168.192.1 255.255.255.252 no ip redirects ip flow ingress ip flow egress ip tcp adjust-mss 1350 no ip mroute-cache load-interval 30 tunnel source FastEthernet0/0 tunnel destination 99.99.99.244 crypto map CMap-HASH ! interface FastEthernet0/0 description dist 0/16 ip address 99.99.99.96 255.255.255.192 ip access-group fa0-0-in in ip access-group fa0-0-out out no ip redirects load-interval 30 speed 100 full-duplex no cdp enable crypto map CMap-HASH ! interface FastEthernet0/1 description dist 0/17 ip address 172.25.0.5 255.255.248.0 no ip redirects load-interval 30 speed 100 full-duplex no cdp enable ! router eigrp 100 redistribute static route-map StaticToEIGRP network 172.25.0.0 0.0.7.255 network 192.168.192.0 0.0.0.3 auto-summary !