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03/31/2005 at 08:39PM PST, ID: 21372474
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7.8

Latency across Cisco 7204

Asked by jeopboy in Network Routers

Tags: cisco

Here's one that I just want to toss around among experts to see if anyone has any idea of root cause.

HeadEnd LAN Device ---------L3 Switch-----------*A*--Cisco 7204--*B*----------OC-3 to WAN-----------Provider Edge Router1-------------CLOUD--------Provider Edge Router2------T-1----Remote 2811-------Remote LAN  ----*C*-Device

The OC-3 runs ~4 Mbps out/~2 Mbps in.   (burstable pricing)
There are about 190 burstable T-1 locations so far with another 50 to go until we complete our rollout.

Customers at the remote location are experiencing performance issues so I started walking my way back from the remote device to the head end.   Pinging Interface *C* at the remote showed RTT of 15-20 msec with random latency variations into a range of 700-1000 msecs.  Gradually I worked my way back through the network until I found that when I ping interface *A* of the 7204, I see no latency variations - 2-5 msec RTT.  When I ping interface *B* ( the Serial Packet over Sonet OC-3 interface), I see the latency variations that correspond with the latency variations to the remote device.

What would cause a router running at 4/2 Mbps (<1500 Packets per second each direction) and 2-3% CPU to add this latency to traffic?

The applcation most affected by this is some Terminal Services traffic where WAN clients are connecting to a Win2003 TS at the head-end so it is not just the ICMP ping traffic.

Any ideas on this would be most appreciated.
[+][-]04/01/05 04:39 AM, ID: 13680270

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[+][-]04/01/05 06:04 AM, ID: 13680890

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[+][-]04/01/05 12:04 PM, ID: 13683935

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[+][-]04/02/05 03:34 AM, ID: 13687487

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[+][-]04/04/05 12:32 PM, ID: 13700929

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[+][-]04/05/05 07:12 AM, ID: 13707347

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About this solution

Zone: Network Routers
Tags: cisco
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Solution Provided By: lrmoore
Participating Experts: 2
Solution Grade: A
 
 
[+][-]04/05/05 09:15 AM, ID: 13708782

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[+][-]04/13/05 08:41 AM, ID: 13773588

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