[j-nsp] Strange latency when using traceroute.

[Alex Campbell]

I have noticed this on J4350s as well (the J4350s are hop 3 and 4):

  1    <1 ms    <1 ms    <1 ms  vpn-aggr1-117gre.dtdesign.com.au
[202.92.250.50]
  2    <1 ms    <1 ms    <1 ms  fe-0-0-0.core1.117gre.dtdesign.com.au
[202.92.250.1]
  3     10 ms     9 ms     9 ms  ge-0-0-3.border1.190cit.dtdesign.com.au
[202.92.251.157]
  4     7 ms     9 ms     9 ms  ge-0-0-2.border2.190cit.dtdesign.com.au
[202.92.251.18]
  5     1 ms     1 ms     1 ms  as65000.border2.190cit.dtdesign.com.au
[218.100.1.25]
  6     1 ms     1 ms     1 ms  you-want-fries-with-your.ausix.net
[218.100.1.14]
  7    15 ms    13 ms    14 ms  pos7-0-0.switch1.syd.pacific.net.au
[210.23.140.181]
  8    13 ms    13 ms    13 ms  wasted.pacific.net.au [61.8.0.55]

We occasionally see spikes up to around 300 ms but I presume this is
just the BGP scanner running.

Also the idle CPU usage on the J4350s seems strangely high - around 10%
with almost no traffic going through the boxes.



-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Stephen Fulton
Sent: Sunday, 1 July 2007 3:05 PM
To: juniper-nsp at puck.nether.net
Subject: [j-nsp] Strange latency when using traceroute.

Hi all,

I've noticed that when traceroute passes through our J6350 (using
8.3R15), that the returned latency is considerably higher from the
router.  Pinging the router or devices past it are fine, but this is one
of those things I know I'll be asked about, and I haven't been able to
figure out.  Here's the redacted output from a sample traceroute:

[sfulton at optics ~]$ traceroute 192.168.254.2 traceroute to 192.168.254.2
(192.168.254.2), 64 hops max, 40 byte packets
  1  router1 (192.168.110.74)  0.337 ms  0.143 ms  0.494 ms
  2  j6350 (192.168.98.65)  25.119 ms  28.051 ms  29.982 ms
  3  router3 (192.168.254.2)  1.079 ms  0.743 ms  0.962 ms
[sfulton at optics ~]$

Now there are filters protecting the routing engine, but I've removed
all others for the purpose of testing.  CPU load is practically zero,
and the J6350 is running OSPF and BGP.

Any ideas?

-- Stephen.
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