So are these links your WAN links to your provider you are referring to? If so are you running BGP over them or just a static default?
On Mon, Feb 16, 2009 at 5:09 PM, Andy Saykao < andy.say...@staff.netspace.net.au> wrote: > Hi Ben, > > When I googled around, there were many discussions abvout using the > variance command with eigrp but we don't run eigrp internally as our IGP. > > This is a typical setup where we need to upgrade some of our links, so we > might upgrade 50M on the second leg and end up with a situation where the > first leg is100M and the second leg is 150M. As you may know, some providers > aren't so flexible so you can't just upgrade 25M on each leg because they > increment by 50M per leg only. Hence my question if it was possible to load > balance across unequal ethernet circuits without buying additional bandwidth > for both circuits. > > Thanks. > > Andy > > > ------------------------------ > *From:* Ben Steele [mailto:illcrit...@gmail.com] > *Sent:* Monday, 16 February 2009 5:29 PM > *To:* Andy Saykao > *Subject:* Re: [c-nsp] Load Balancing of Unequal Ethernet Bandwidth > > You could do this with variance in eigrp, just add variance 2 into the > eigrp config and it will load balance on a 2:1 ratio, if your links are > equally matched in terms of latency you can look at enabling per-packet load > sharing on the 2 egress interfaces to get an even more granular > distribution, this can wreck some havoc with unequal paths and out of > sequence packets though, however if equally similar in characteristics then > performance is usually very good. > Ben > > On Mon, Feb 16, 2009 at 4:01 PM, Andy Saykao < > andy.say...@staff.netspace.net.au> wrote: > >> Is it possible to aggregate and then load balance unequal ethernet >> circuits like so: >> >> I have two ethenet circuits on my Cisco router. Both have equal costs to >> the next hop. >> >> Ethernet Circuit #1- 200M >> Ethernet Circuit #2 - 100M >> >> Can I aggregate both ethernet circuits so that the total amount of >> bandwidth available to the next hop is is 300M? >> Can I then load balance it so both circuits are equally utilized? >> >> For example... >> >> * If I have 150M of traffic flowing to the next hop then the router >> would spread the load across both links like so: >> >> 100M through Ethernet Circuit #1. >> 50M through Ethernet Circuit #2. >> >> * The formula to use for this would be something like: >> >> Utilization / Total Bandwidth = percentage of utilization required per >> link >> 150/300 = 0.5 >> >> 0.5 x bandwidth of Ethernet #1 = 0.5 x 200 = 100M >> 0.5 x bandwidth of Ethernet #1 = 0.5 x 100 = 50M >> >> * If there was a total of 250M of traffic flowing to the next hop, and >> applying the formula above, the router would work out that the load >> distributed across both ethernet links would be: >> >> 166M through Ethernet Circuit #1. >> 84M through Ethernet Circuit #2. >> >> Any ideas??? >> >> Thanks. >> >> Andy >> >> This email and any files transmitted with it are confidential and intended >> solely for the use of the individual or entity to whom they are >> addressed. >> Please notify the sender immediately by email if you have received this >> email by mistake and delete this email from your system. Please note that >> any views or opinions presented in this email are solely those of the >> author and do not necessarily represent those of the organisation. >> Finally, the recipient should check this email and any attachments for >> the presence of viruses. The organisation accepts no liability for any >> damage caused by any virus transmitted by this email. >> >> _______________________________________________ >> cisco-nsp mailing list cisco-nsp@puck.nether.net >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ >> > > > ______________________________________________________________________ > This email has been scanned by the MessageLabs Email Security System. > For more information please visit http://www.messagelabs.com/email > ______________________________________________________________________ > > This email and any files transmitted with it are confidential and intended > solely for the use of the individual or entity to whom they are addressed. > Please notify the sender immediately by email if you have received this > email by mistake and delete this email from your system. Please note that > any views or opinions presented in this email are solely those of the author > and do not necessarily represent those of the organisation. Finally, the > recipient should check this email and any attachments for the presence of > viruses. The organisation accepts no liability for any damage caused by any > virus transmitted by this email. > _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/