BGP ebgp 邻居建立报错

vickie

R1：
*Apr 18 11:01:36.671: %BGP-5-ADJCHANGE: neighbor 3.3.3.3 Down Peer closed the session
*Apr 18 11:01:36.671: %BGP_SESSION-5-ADJCHANGE: neighbor 3.3.3.3 IPv4 Unicast topology base removed from session  Peer closed the session
*Apr 18 11:01:46.227: %BGP-5-ADJCHANGE: neighbor 3.3.3.3 Up
R2：
*Apr 18 11:01:02.967: %BGP-5-ADJCHANGE: neighbor 4.4.4.4 Up
*Apr 18 11:04:03.459: %BGP-5-ADJCHANGE: neighbor 4.4.4.4 Down BGP Notification sent
*Apr 18 11:04:03.463: %BGP-3-NOTIFICATION: sent to neighbor 4.4.4.4 4/0 (hold time expired) 0 bytes
*Apr 18 11:04:03.475: %BGP_SESSION-5-ADJCHANGE: neighbor 4.4.4.4 IPv4 Unicast topology base removed from session  BGP Notification sent
R3：
*Apr 18 11:01:51.199: %BGP_SESSION-5-ADJCHANGE: neighbor 5.5.5.5 IPv4 Unicast topology base removed from session  Peer closed the session
R4：
*Apr 18 11:02:36.007: %BGP_SESSION-5-ADJCHANGE: neighbor 5.5.5.5 IPv4 Unicast topology base removed from session  Peer closed the session

R5：
*Apr 18 11:03:20.319: BGP: 3.3.3.3 remote connection attempt failed(due to session creation failure, local address 5.5.5.5
*Apr 18 11:03:28.179: BGP: 4.4.4.4 remote connection attempt failed(due to session creation failure, local address 5.5.5.5

应该怎样解决，求助各位大神

h19

BGP排错就几个方面：看一下是不是全网可达，包括那些回环口，有没有使用ACL拒绝了TCP 179端口的流量，邻居AS号是否指定错误，双工匹配吗？

h19

还有是否修改了AD值？

wangsniffer

邻居建立不起来，只能是ospf配置的有问题，导致环回接口不可达

wangsniffer

邻居建立不起来，只能是ospf配置的有问题，导致环回接口不可达

dingjerry

事先用扩展Ping来测试本地回环接口是否能到达邻居的回环接口。