At 06:18 PM 7/14/2003 +0000, p b wrote: >Consider two routers which have 3 GEs between them (no L2 >device between them). > >Is it "better" to configure each of these GEs as >a standalone L3 connection or to combine them GEs into >an etherchannel (802.1ae?) bundle? > >My $0.02 would be to keep them at L3 and not run another >protocol underneath to enable bundling.
Bundling is useful to decrease L3 complexity (less IP addresses, less links, less instability in routing). > The question I've >heard with this approach is how granular the load splitting >works when splitting load across three interfaces. I think the Cisco implementation splits based on flow (not quite sure what "flow" exactly means in this context but it is not that important), so the load might be split unevenly. > If CEF >does per packet load splitting, would the load be (nearly) >equal across the three interfaces (eg within 1-2% at all times)? Should be. Unless you construct traffic specifically to screw it up, like send 2 64 byte packets, then a 1500 byte packet, and then repeat... :) >When using per packet CEF, is there an issue with packets being received out >of order? Yes. > (Consider some flow where a large packet >is sent over one interface and the following flow packet is small >and sent over another interface. The small packet might be >received completely before the large packet. Does per packet >CEF address this issue?) No. How could it? CEF is a decision making mechanism local to the router, not an encapsulation. Thanks, Zsombor >I had heard that etherchannel (or the IEEE derivative) would >support nearly equal load splitting across N interfaces. >And it also defines a mechanism so that the receiving router >would be able to detect and re-order packets which arrive out of >order). > >Comments? Pointers to relevant docs? > >THanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=72273&t=72258 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
