在 Cisco IOS 设备上，该命令logging buffered 51200 notifications会将大部分信息记录到路由器内存中（显然您可以将其更改为informational或debugging根据需要）。
当通过 telnet 或 SSH 连接到路由器时，我可以执行命令terminal monitor( term mon) 使这些事件在我的会话中实时显示。当通过控制台连接时，这会自动发生。
我怎样才能在 JunOS 上达到同样的效果；例如，当我添加 IGP/EGB 邻居时，我希望看到新的邻接出现，而不是不断查看日志。
'monitor start messages' 大致相当于'term mon。'messages' 是您要监控的日志文件的名称。
如果没有看到预期的输出，则需要更改“设置配置系统系统日志文件 X ...”中记录到给定文件的内容。
见下文：
[edit protocols bgp]
root@vr-device# show
traceoptions {
file bgp-log;
flag packets detail;
}
group test {
type external;
peer-as 2;
local-as 1;
neighbor 172.16.12.110;
}
[编辑协议 bgp] root@vr-device# run monitor start bgp-log
[编辑协议 bgp] root@vr-device#
*** bgp-log ***
Jun 24 10:58:19.384061 bgp_connect_complete: error connecting to 172.16.12.110
(External AS 2): Socket is not connected
Jun 24 10:58:33.408670
Jun 24 10:58:33.408670 BGP RECV 172.16.12.110+54592 -> 172.16.12.128+179
Jun 24 10:58:33.408790 BGP RECV message type 1 (Open) length 59
Jun 24 10:58:33.408792 BGP RECV version 4 as 2 holdtime 90 id 20.0.0.2 parmlen 30
Jun 24 10:58:33.408794 BGP RECV MP capability AFI=1, SAFI=1
Jun 24 10:58:33.408809 BGP RECV Refresh capability, code=128
Jun 24 10:58:33.408811 BGP RECV Refresh capability, code=2
Jun 24 10:58:33.408920 BGP RECV Restart capability, code=64, time=120, flags=
Jun 24 10:58:33.408922 BGP RECV 4 Byte AS-Path capability (65), as_num 2
Jun 24 10:58:33.409054 advertising graceful restart receiving-speaker-only capability to neighbor 172.16.12.110 (External AS 2)
Jun 24 10:58:33.409056 bgp_send: sending 59 bytes to 172.16.12.110 (External AS 2)
Jun 24 10:58:33.409058
Jun 24 10:58:33.409058 BGP SEND 172.16.12.128+179 -> 172.16.12.110+54592
Jun 24 10:58:33.409060 BGP SEND message type 1 (Open) length 59
Jun 24 10:58:33.409062 BGP SEND version 4 as 1 holdtime 90 id 192.168.11.3 parmlen 30
Jun 24 10:58:33.409064 BGP SEND MP capability AFI=1, SAFI=1
Jun 24 10:58:33.409066 BGP SEND Refresh capability, code=128
...
运行监控停止
使用协议监控接口的流量，将其发送到类似于wireshark的pcap文件，通常在var/log目录中。
monitor traffic interface ge-0/0/0
monitor interface ge-0/0/0
monitor traffic interface ge-0/2/3 matching "proto 89" write-file ospf.cap - matches proto 89 and writes it in ospf.cap
show security flow session ... options
#set system syslog file messages any info – to save all log messages to file “messages”
显示所有日志消息-
show log messages | match LOGIN | match “Mar 16”
file list detail /var/log = ls –al (to see permitions, etc.)
clear log messages - to clear the contents of the messages file
monitor start messages - live monitoring of messages file
monitor list
monitor stop – to stop all
有关流程的更多详细信息，请在流程级别下：
#set traceoptions file filenamefil world-readable
#set traceoptions flag all