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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: Possible explanations for a large hop in latency
Did that satisfy you? I guess with MPLS they could tag the traffic and send it around the country twice and I wouldn't see it at L3. Frank -----Original Message----- From: John T. Yocum [mailto:[email protected]] Sent: Thursday, June 26, 2008 7:04 PM To: [email protected] Cc: nanog list Subject: Re: Possible explanations for a large hop in latency When I asked ATT about the sudden latency jump I see in traceroutes, they told me it was due to how their MPLS network is setup. --John Frank Bulk wrote: > Our upstream provider has a connection to AT&T (12.88.71.13) where I > relatively consistently measure with a RTT of 15 msec, but the next hop > (12.122.112.22) comes in with a RTT of 85 msec. Unless AT&T is sending that > traffic over a cable modem or to Europe and back, I can't see a reason why > there is a consistent ~70 msec jump in RTT. Hops farther along the route > are just a few msec more each hop, so it doesn't appear that 12.122.112.22 > has some kind of ICMP rate-limiting. > > Is this a real performance issue, or is there some logical explanation? > > Frank > >
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