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FAQ-How to make the device display no PE public network address when tracert

Publication Date:  2012-11-22 Views:  44 Downloads:  0
Issue Description
Q:
How to make the device display no PE public network address when tracert?
Topology:
Ce——pe——p——pe——ce
Tracert other side CE address on CE,the result is as follows:
<S9300>tracert 13.1.1.3
traceroute to  13.1.1.3(13.1.1.3) 30 hops max,40 bytes packet
1 12.1.1.1 30 ms  1 ms  1 ms
2 192.168.0.14 10 ms  10 ms  1 ms
3 192.168.0.2 1 ms  1 ms  1 ms
4 13.1.1.1 1 ms  1 ms  1 ms
5 13.1.1.3 1 ms  1 ms  1 ms
Step 2 and 3 address is public network IP address.

Alarm Information
NULL
Handling Process
A:
If you do not want the public network address displayed, it needs to configure the following command on 2 PE device and reboot mpls ldp:
[msw4]undo ttl propagate
[msw4]q
<msw4>reset mpls ldp
<msw4>  
[msw3]undo ttl propagate
[msw3]q
<msw3>reset mpls ldp
<msw3>
After LDP rebuild,CE tracert other side CE again,the result is as follows:
<S9300>tracert 13.1.1.3
traceroute to  13.1.1.3(13.1.1.3) 30 hops max,40 bytes packet
1 12.1.1.1 30 ms  1 ms  1 ms
2 13.1.1.3 1 ms  1 ms  160 ms
<93300>
There is no public network side address displayed.

Root Cause
NULL
Suggestions
S9300 device ttl copy behavior is default by uniform mode,tracert on this mode, mpls outer and inner label will be reduced by 1, it will emerge the ip address of P device in middle of pipeline. Ttl propagate is uniform mode.
After undo ttl propagate,change the ttl copy behavior to pipe,do the tracert,it wll reduce the outer label by 1,it will not display Ip mode of p device in VPN tunnel.

END