SR8808X-tracert直连接口不通的问题处理案例

   DR01（G2/0/2，10.59.164.233）-----（G2/0/2，10.59.164.234）DR0R2

    现场两台SR8808X直连，在DR01上面tracert DR02的接口地址不通，DR02上面tracert DR01是能通的。两端互ping都可以通，

<SY-JTXCF-DR01-SR8808X>ping 10.59.164.234

Ping 10.59.164.234 (10.59.164.234): 56 data bytes, press CTRL_C to break

56 bytes from 10.59.164.234: icmp_seq=0 ttl=255 time=3.307 ms

56 bytes from 10.59.164.234: icmp_seq=1 ttl=255 time=3.471 ms

<SY-JTXCF-DR01-SR8808X>tracert 10.59.164.234

traceroute to 10.59.164.234 (10.59.164.234), 30 hops at most, 52 bytes each packet, press CTRL_C to break

1  * * *

2  * * *

         在DR02上面debug ip icmp，显示ICMP速率达到限制，被丢弃，

*Jul  4 00:44:51:871 2017 SY-JTXCF-DR02-SR8808X SOCKET/7/ICMP: -MDC=1-Slot=2;

ICMP Discard:ICMP reached rate limit.

         之后请现场在DR02上面将ICMP差错报文的令牌桶改为40后，tracert正常。现场排查过，没有其他设备持续tracert经过DR02，DR02上面按说不应该恢复差错报文到达速率限制，display icmp statistics中，差错报文增长不是很快，

[SY-JTXCF-DR02-SR8808X]ip icmp error-interval 100 40

  ===============display icmp statistics=============== 

  Input: bad formats   0                   bad checksum            0        

         echo          345007              destination unreachable 81       

         source quench 0                   redirects               0        

         echo replies  105                 parameter problem       0        

         timestamp     0                   information requests    0        

         mask requests 0                   mask replies            0        

         time exceeded 368                 invalid type            0        

         router advert 0                   router solicit          0        

         broadcast/multicast echo requests ignored            0        

         broadcast/multicast timestamp requests ignored       0        

 Output: echo          126                 destination unreachable 11638  //现场反馈该数值增长并不快，该计数一直没有清过，设备运行30周了，1万多的差错报文不是很多

         source quench 0                   redirects               0        

         echo replies  345007              parameter problem       0        

         timestamp     0                   information replies     0        

         mask requests 0                   mask replies            0        

         time exceeded 141                 bad address             0        

         packet error  14143               router advert           0