Juniper MX中基于LDP的VPLS连接中的PE路由

Question

我正在观察'PE路由下行消息‘对基于LDP的基于Juniper的VPLS连接。IGP协议是- is。LDP VPLS连接是点对点(只有两个端点)。

当我用广泛的旋钮检查LDP VPLS的状态时，它在连接历史‘PE路由’和‘状态更新定时器’中显示。谁能解释一下这是什么意思吗？日志消息中还观察到，VPLS连接从上到下，然后再向上。

以下是一些观察结果

当我们在路由表中检查到LDP对等ip (目标会话)的路由时，在inet.0路由年龄比inet.3“更多”。

自民党与目标同伴的会议不要翻脸。

下面是配置和日志。

R1> show configuration routing-instances 1784 
instance-type vpls;
interface ge-2/1/5.1784;
protocols {
    vpls {
        encapsulation-type ethernet-vlan;
        no-tunnel-services;
        vpls-id 1784;
        mtu 1500;
        neighbor 192.168.0.18;
    }
}



R1> show vpls connections instance 1784 extensive 
Instance: 1784
      VPLS-id: 1784
        Number of local interfaces: 1
        Number of local interfaces up: 1
        ge-2/1/5.1784      
        lsi.1097220                   Intf - vpls 1784 neighbor 192.168.0.18 vpls-id 1784
        Neighbor                  Type  St     Time last up          # Up trans
        192.168.0.18(vpls-id 1784) rmt  Up     May 14 11:14:20 2019        1196
          Remote PE: 192.168.0.18, Negotiated control-word: No
          Incoming label: 262190, Outgoing label: 153422
          Negotiated PW status TLV: No
          Local interface: lsi.1097220, Status: Up, Encapsulation: VLAN
            Description: Intf - vpls 1784 neighbor 192.168.0.18 vpls-id 1784
          Flow Label Transmit: No, Flow Label Receive: No
        Connection History:                 
            May 14 11:14:20 2019  status update timer  
            May 14 11:14:20 2019  PE route down        
            May 14 11:14:15 2019  status update timer  
            May 14 11:14:14 2019  PE route down        
            May 14 10:14:20 2019  status update timer  
            May 14 10:14:20 2019  PE route down        
            May 14 10:14:15 2019  status update timer  
            May 14 10:14:14 2019  PE route down        
            May 14 09:19:43 2019  status update timer  
            May 14 09:19:42 2019  PE route down        
            May 14 09:19:38 2019  status update timer  
            May 14 09:19:36 2019  PE route down        
            May 14 09:14:20 2019  status update timer  
            May 14 09:14:20 2019  PE route down        
            May 14 09:14:15 2019  status update timer  
            May 14 09:14:14 2019  PE route down        
            May 14 08:14:20 2019  status update timer  
            May 14 08:14:20 2019  PE route down        
            May 14 08:14:15 2019  status update timer  
            May 14 08:14:14 2019  PE route down 

R1> show route 192.168.0.18 

inet.0: 47621 destinations, 141466 routes (47621 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

192.168.0.18/32    *[IS-IS/18] 02:53:29, metric 149
                    > to 192.168.7.14 via ae0.3
                      to 192.168.7.18 via ae15.3

inet.3: 262 destinations, 262 routes (262 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

192.168.0.18/32    *[LDP/9] 00:58:42, metric 149
                    > to 192.168.7.14 via ae0.3, Push 50294
                      to 192.168.7.18 via ae15.3, Push 670023

R1> show ldp session 192.168.0.18 detail 
Address: 192.168.0.18, State: Operational, Connection: Open, Hold time: 29
  Session ID: 192.168.1.35:0--192.168.0.18:0
  Next keepalive in 9 seconds
  Passive, Maximum PDU: 4096, Hold time: 30, Neighbor count: 1
  Neighbor types: configured-layer2
  Keepalive interval: 10, Connect retry interval: 1
  Local address: 192.168.1.35, Remote address: 192.168.0.18
  Up for 3w4d 07:43:50

日志消息如下所示：

May 14 11:14:14.419 2019  R1 rpd[9997]: %DAEMON-5-RPD_LAYER2_VC_DOWN: State of Layer 2 VC (Neighbor : 192.168.0.18, VC-ID : 1784) changed from UP to VC-Dn
May 14 11:14:15.891 2019  R1 rpd[9997]: %DAEMON-6-RPD_LAYER2_VC_UP: State of Layer 2 VC (Neighbor : 192.168.0.18, VC-ID : 1784) changed to UP
May 14 11:14:20.085 2019  R1 rpd[9997]: %DAEMON-5-RPD_LAYER2_VC_DOWN: State of Layer 2 VC (Neighbor : 192.168.0.18, VC-ID : 1784) changed from UP to VC-Dn
May 14 11:14:20.688 2019  R1 rpd[9997]: %DAEMON-6-RPD_LAYER2_VC_UP: State of Layer 2 VC (Neighbor : 192.168.0.18, VC-ID : 1784) changed to UP

Answer 1

如果接口(在您的例子中是ge-2/1/5 )关闭，则VC将关闭，因此运行show interfaces ge-2/1/5并根据日志条目确认Last Flapped:时间。