AR系列路由器debugging bgp all命令

AR系列路由器debugging bgp all命令详解

 

BGP/MBGP组网示意图

 

【命令】

debugging bgp all

【视图】

用户视图

【参数】

无

【描述】

debugging bgp all命令打开BGP所有调试信息。

<RT1>display debugging

BGP event debugging is on

BGP normal debugging is on

BGP open debugging is on

BGP update debugging is on

BGP keepalive debugging is on

BGP route-refresh debugging is on

BGP mp-update debugging is on        

该命令会打开所有和BGP相关的调试信息，包括：各种event信息、普通debugging信息、OPEN报文信息、UPDATE报文信息、KEEPALIVE报文信息、路由刷新信息以及mp-update报文信息等全部信息。信息量会比较大，可能影响系统应用，建议少用。

【举例】

例1：当RT2和RT3建立IBGP邻居关系过程中，打开此调试信息显示如下：

配置信息：

[RT2-bgp]display this

#

bgp 100

 undo synchronization

 group as100 internal

 peer 20.1.1.1 group as100

#                        

=======================

[RT3-bgp] display this

#

bgp 100

 undo synchronization

 group as100 internal

 peer 20.1.1.2 group as100

#         

＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝

调试信息如下：

[RT2]bgp 100

[RT2-bgp]group as100 internal

*0.2633109 RT2 RM/7/RTDBG:bgp: initializing group as100

\\配置好group后会有配置指定的group初始化提示信息；

 

[RT2-bgp]peer 20.1.1.1 group as100

*0.2633562 RT2 RM/7/RTDBG:bgp event: peer 20.1.1.1 (Internal AS 100) old state Idle event Start new state Active

\\配置指定好邻居后会有状态进入Active提示信息，并指定邻居ip地址以及as号

 

[RT2-bgp]

*0.2645656 RT2 RM/7/RTDBG:bgp: BGP_100_Connect connect timeout

\\连接超时提示

 

*0.2645656 RT2 RM/7/RTDBG:bgp: peer 20.1.1.1 (Internal AS 100) start connecting

\\重新向对端建立连接

 

*0.2645656 RT2 RM/7/RTDBG:bgp event: peer 20.1.1.1 (Internal AS 100) old state Active event ConnectRetry new state Connect

\\BGP状态机进入Connect状态

 

*0.2645672 RT2 RM/7/RTDBG:bgp: connection established with 20.1.1.1 (Internal AS 100)

\\TCP连接正常建立

 

*0.2645672 RT2 RM/7/RTDBG:bgp: peer 20.1.1.1 (Internal AS 100) socket 4 set for reading

*0.2645672 RT2 RM/7/RTDBG:bgp event: peer 20.1.1.1 (Internal AS 100) old state Connect event Open new state OpenSent

\\BGP状态机从Connect状态进入OpenSent状态

 

*0.2645672 RT2 RM/7/RTDBG:BGP SEND 20.1.1.2+1026 -> 20.1.1.1+179

*0.2645672 RT2 RM/7/RTDBG:BGP SEND message type 1 (Open) length 39

*0.2645672 RT2 RM/7/RTDBG:BGP SEND Capabilities:

*0.2645672 RT2 RM/7/RTDBG:multi-protocol afi(1), safi(1) route-refresh

*0.2645672 RT2 RM/7/RTDBG:BGP SEND version 4 as 100 holdtime 180 id 10.1.1.2 authcode 0

*0.2645672 RT2 RM/7/RTDBG:bgp send: sending 39 bytes to 20.1.1.1 (Internal AS 100)

\\向邻居20.1.1.1发送Open报文，并有open报文的各个参数；

 

*0.2645672 RT2 RM/7/RTDBG:bgp: recv open from peer 20.1.1.1 (Internal AS 100)

*0.2645672 RT2 RM/7/RTDBG:BGP RECV 20.1.1.1+179 -> 20.1.1.2+1026

*0.2645672 RT2 RM/7/RTDBG:BGP RECV message type 1 (Open) length 39

*0.2645687 RT2 RM/7/RTDBG:BGP RECV Capabilities:

*0.2645687 RT2 RM/7/RTDBG:multi-protocol afi(1), safi(1) route-refresh

*0.2645687 RT2 RM/7/RTDBG:BGP RECV version 4 as 100 holdtime 180 id 20.1.1.1 authcode 0

\\从邻居20.1.1.1接收Open报文，并有open报文的各个参数；

 

*0.2645687 RT2 RM/7/RTDBG:bgp event: peer 20.1.1.1 (Internal AS 100) old state OpenSent event RecvOpen new state OpenConfirm

\\BGP状态机从OpengSent状态进入OpenConfirm状态

 

*0.2645687 RT2 RM/7/RTDBG:BGP SEND 20.1.1.2+1026 -> 20.1.1.1+179

*0.2645687 RT2 RM/7/RTDBG:BGP SEND message type 4 (KeepAlive) length 19

*0.2645687 RT2 RM/7/RTDBG:bgp send: sending 19 bytes to 20.1.1.1 (Internal AS 100)

\\向邻居20.1.1.1发送KeepAlive报文，并有KeepAlive报文的各个参数；

 

*0.2645703 RT2 RM/7/RTDBG:bgp read: 20.1.1.1 (Internal AS 100): 0 bytes buffered

*0.2645703 RT2 RM/7/RTDBG:bgp: recv open from peer 20.1.1.1 (Internal AS 100)

\\再次从邻居20.1.1.1接收Open报文信息

 

*0.2645703 RT2 RM/7/RTDBG:BGP RECV 20.1.1.1+179 -> 20.1.1.2+1026

*0.2645703 RT2 RM/7/RTDBG:BGP RECV message type 4 (KeepAlive) length 19

\\从邻居20.1.1.1接收KeepAlive报文，并有KeepAlive报文的各个参数；

 

*0.2645703 RT2 RM/7/RTDBG:bgp event: peer 20.1.1.1 (Internal AS 100) old state OpenConfirm event RecvKeepAlive new state Established

\\BGP状态机接收KeepAlive报文后从OpenConfirm状态进入Established状态

 

*0.2645703 RT2 RM/7/RTDBG:bgp: setting flash/new policy routines for BGP group as100

\\向对等体AS100设定各种路由策略；

 

*0.2645703 RT2 RM/7/RTDBG:bgp: setting reinit routine for BGP_100

\\重新初始化路由

 

*0.2645703 RT2 RM/7/RTDBG:bgp: peer 20.1.1.1 (Internal AS 100) receiver changed to bgp_recv_v4_update

*0.2645703 RT2 RM/7/RTDBG:bgp: rt policy init, first group peer update group as100 peer 20.1.1.1 (Internal AS 100)

\\如果配置了路由策略，进行策略初始化

 

*0.2645703 RT2 RM/7/RTDBG:bgp: rt policy init, peer 20.1.1.1 (Internal AS 100) 0 routes ready 0 deferred

\\路由策略初始化过程中对匹配路由数和延迟处理路由数的显示

 

*0.2645734 RT2 RM/7/RTDBG:BGP SEND 20.1.1.2+1026 -> 20.1.1.1+179

*0.2645734 RT2 RM/7/RTDBG:BGP SEND message type 4 (KeepAlive) length 19

*0.2645734 RT2 RM/7/RTDBG:bgp send: sending 19 bytes to 20.1.1.1 (Internal AS 100)

\\向邻居20.1.1.1发送KeepAlive报文，并有KeepAlive报文的各个参数；

 

*0.2645734 RT2 RM/7/RTDBG:bgp: receiving updates from peer 20.1.1.1 (Internal AS 100)

\\从邻居20.1.1.1收到更新消息

*0.2645734 RT2 RM/7/RTDBG:BGP RECV 20.1.1.1+179 -> 20.1.1.2+1026

*0.2645734 RT2 RM/7/RTDBG:BGP RECV message type 4 (KeepAlive) length 19

*0.2645734 RT2 RM/7/RTDBG:bgp: done with peer 20.1.1.1 (Internal AS 100) received 19 octets 0 updates 0 routes

\\再次从邻居20.1.1.1接收KeepAlive报文，并有KeepAlive报文的各个参数；

 

 

[RT2-bgp]dis bgp peer

 

Peer    AS-num Ver Queued-Tx  Msg-Rx Msg-Tx Up/Down  State

------------------------------------------------------------------------------------------------------

20.1.1.1 100     4   0           1      3      00:00:05  Established

\\邻居正常建立

 

上面是打开debugging bgp all RT2得到全部调试信息的一个流程（先配置RT2端，然后再配置RT3端），当发现设备无法建立邻居关系时，可以初步对比此流程，观察是否缺少某个步骤报文，进而定位问题所在。