Question

Lan\WAN design with 3750

Asked by: Metr0star

This question is about a current design. i have a network where i have two 3750s connect together over fibre and switch two has a 100mb WAN connetion. When i ping a remote system from the first switch ,which is on the LAN side i get packet loss.  So the ping is going from switch one to switch two over 1000mb fibre link and then out over the WAN on a 100mb link. would his be a QOS ISSUE ?

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Asked On
2008-12-10 at 12:12:09ID23973948
Tags

Cisco

,

3750

,

3750 with 1000 SFX & fibre

Topics

Network Switches & Hubs

,

Networking Hardware

,

Network Routers

Participating Experts
3
Points
500
Comments
6

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Answers

 

by: bkepfordPosted on 2008-12-10 at 12:50:22ID: 23142959

So from a PC on switch two is there packet loss? What is the fiber trunk setup. Is it happening from any device on switch one that you see the issue. Are they on differnet subnets between the pinging device and the destination?

 

by: jhara01Posted on 2008-12-10 at 14:14:45ID: 23143852

Have you tried ping from both of your switches to see if you have packet loss there?  I would "walk" your ping from one device to another working towards your wan IP until you see a change.  That would help pinpoint where you have the issue.  If you have packet loss on all points then you probably have an issue on your WAN link.

 

by: bkepfordPosted on 2008-12-10 at 14:41:12ID: 23144062

My post was pretty much saying the same thing but ok.

 

by: TreyHPosted on 2008-12-11 at 09:51:28ID: 23150543

It's quite common to loose the first ping reply from a remote host with Cisco gear due to an ARP table lookup (the first ICMP packet actually gets dropped). Are you just loosing the first ping reply and then the rest are ok, or is it random loss?

 

by: Metr0starPosted on 2008-12-12 at 05:59:37ID: 23157168

Can someone send me a link to a good document that explains QOS i.e how to set thresholds and buffers

 

by: bkepfordPosted on 2008-12-12 at 06:45:46ID: 23157520

20120131-EE-VQP-002

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