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FAQ-Why AS number is showed in tracert result

Publication Date:  2012-07-27 Views:  63 Downloads:  0
Issue Description
【Product】NE40E-X8

【Software Version】V6R1C00SPC800

【Problem Description】Why AS number is showed in tracert result?

【Problem Phenomenon】
<HUAWEI>tracert -vpn-instance iub 10.108.31.29
traceroute to iub 10.108.31.29(10.108.31.29), max hops: 30 ,packet length: 40,press CTRL_C to break
1 10.220.X.42 6 ms  18 ms  9 ms
2 10.220.X.46 6 ms  18 ms  9 ms
3 10.220.X.50 11 ms  9 ms  10 ms
4 10.220.X.54 10 ms  11 ms  8 ms
5 10.220.X.58 54 ms  1 ms  20 ms
6 10.220.X.37 6 ms  10 ms  10 ms
7 10.108.31.29 < AS=65343 > 11 ms  8 ms  10 ms

Alarm Information
None

Handling Process
None.



Root Cause
If search Hop IP in FIB, OriginAS field is non-zero, and then AS number will be showed in tracert result.

<HUAWEI>dis fib -vpn-instance iub 10.108.31.29 verbose
  Route Entry Count: 1
 Destination: 10.108.31.29          Mask     : 255.255.255.0
 Nexthop    : 10.220.64.42          OutIf    : GigabitEthernet1/0/0
 LocalAddr  : 10.220.64.41          LocalMask: 0.0.0.0
 Flags      : DGU                   Age      : 14968sec
 ATIndex    : 0                   Slot     : 1
 LspFwdFlag : 1                   LspToken : 0x1018 
 InLabel    : 13314                OriginAs : 65343

Each return IP address is the IP address on the incoming interface of the P router except final desination IP.
For each hop IP, local will check its OriginAS info in FIB, if OriginAS field is non-zero, AS number will be showed in tracert result. If OriginAS field is zero, then AS number will not be showed. Searching each hop IP is necessary, purpose is to check and show where return IP is from.


Suggestions
None.

END