Question about dual ISPs and high latency

[imnotorginal]

Hi all,

Heres my situations... Remote site in South America, has a site to site tunnel with main office. Remote site has 2 ISPs (One link 200Mbps the other link is 300Mbps) and both ISPs enter the remote office using the same border switch (different ports).  We have the Lan to Lan tunnel using the 200 Mbps link.  Using our monitoring software, I noticed that we are frequently hitting the bandwidth limit of 300Mbps link.  The traffic is constantly at 300 some times 320 Mbps.

Could the over saturated link (300Mbps ISP) cause latency in the other link (200 Mbps)?  From my understanding, when a link is over saturated, packets are placed in a buffer until they can be transmitted.  Would this cause high latency in the 200 Mbps link? 200 Mbps link usually averages 100 Mbps of traffic.

I think I explained this pretty well, but let me know if anything needs more details.

Thank you in advance.

[Reza Sharifi]

Hi,

Could the over saturated link (300Mbps ISP) cause latency in the other link (200 Mbps)?

It should not.  You are paying to 2 different circuits form the ISP and one should not affect the other one unless something is configured incorrectly or something else is going on.  I would contact the ISP and figure the connectivity details from their site. Are both circuits from the same ISP?  For redundancy, it is always a good idea to use a different provider per circuit.

HTH

[imnotorginal]

Different ISPs.  I was concerned that since one link is sending a ton of packets into the switch buffer, both links would some how be competing for resources.