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Latency with serial interfaces

jrenaudie
Level 1
Level 1

Hi all!

I Have a quite simple network with 2 ISR3945 connecting with a back to back cable by 2 serial interface (G703) connected in 2mbps. Behind each of the routeur there is a switch with hosts.

when I ping from Host A to host B (not the same side of the WAN of course) the latency is about 3-4 ms. No problem with that.

But If I send some traffic (with Iperf) from host C to D, even 1Mbps traffic, the latency grows up to 25ms, with 3M I have up to 45ms.

I tried to tag my traffic and then apply CBWFQ with LLQ but there is no change.

Can someone explain why?

regards,

Jerome

1 Reply 1

jrenaudie
Level 1
Level 1

maybe a kind of dejitter buffer??