I have more then 450 locations with Cisco 2610 & Catalyst 1924 couples in my WAN. But i saw that some of these couples have a problem: can not send packets larger than 1500 bytes properly, some of them are lost. The characteristics of this couples are shown below:
Part number 73-2839-08
PCA Number: 73-3121-04
Model Number: WS-C1924-A
V8.01.02 : Standard Edition
I tried to download and update the Catalyst 1924 to V9.00.06 but there is no difference.
How can it be true? Is this a reality or am I dreaming?
This sounds like a path MTU problem. You cannot send packets larger than 1500 without fragmentation or path MTU. If a host (on a lan with a larger mtu than the intervening network can handle) uses PMTU it sends packets with the do not fragment bit set and the network device should send back an ICMP message so the host will try a smaller size. If the network device doesnt support PMTU it just drops the packet, hence lost data. Can you explain where the large packets are coming from? Is there a lan with a larger mtu or is the host preframenting the data?
Yes this is a kind of MTU problem and the problem is over when mtu of the interface decreased to 1400. But i want to learn if there is a known problem with Cisco 2610 (Part number 73-2839-08 ) and Catalyst 1924 (PCA Number: 73-3121-04, Model Number: WS-C1924-A, V8.01.02 : Standard Edition). Because i don't have any problem with Cisco 2610 (Part number 73-2839-11, xxxxxxx-12, xxxxxxx13 ) and Catalyst 1924 (PCA Number: 73-3121-04, Model Number: WS-C1924-A, V8.00.xx : Standard Edition, and Enterprise Edition).
Large packets are coming from central office. Some screen shots of the application are saved on branch office's application server. They are sent to branch in night, but we saw that some of them could not be replaced. At the end of this research only 10 of these branches with -08 router and 8.01 switch has this problem. All the other 440 branches work properly.
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