[nsp] RE: No replies on alternate packets of traceroutes

Kashif.Khawaja at Broadwing.com Kashif.Khawaja at Broadwing.com
Mon Nov 17 14:28:14 EST 2003

Hi All,

I was wondering if somebody could shed light on whether it is normal behaviour to not see
replies on alternate packets in traceroutes from one cisco router to another e.g.

Lab#trace ip

Target IP address:
Source address: 
Numeric display [n]: 
Timeout in seconds [3]: 
Probe count [3]: 10
Minimum Time to Live [1]: 
Maximum Time to Live [30]: 
Port Number [33434]: 
Loose, Strict, Record, Timestamp, Verbose[none]: 
Type escape sequence to abort.
Tracing the route to L0.lab (

  1 P4-0.lab ( 0 msec *  0 msec *  88 msec *  60 msec *  0 msec * 

I have verified that layer one is clean. Pings are fine. No drops there. No particular
process is shooting up really high. About the only one I see is the IP Input process
showing some activity but I guess that is to be expected since these packets are probably
being Process switched. Basically, there are a few stable BGP sessions on each router and
not a lot of traffic passing through the link or the routers.

Any pointers (even to documents) would be helpful!

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