Good answers. Here are a few additional comments. OSPF is an IETF standard, which has the following advantages:
You have access to the RFCs that describe it, which can help when troubleshooting and designing network changes, even though the RFCs aren't very readable. Engineers from around the world can enhance OSPF, using standard IETF procedures and taking advantage of IETF work on advanced routing protocol features. EIGRP is not an IETF standard. You said below that the spec if available, but that's not true. Cisco has lots of documentaton on EIGRP but they have not released a specification for it. The fact that EIGRP is not a standard means that it probably won't be able to take advantage of new IETF work, or at least not as easily, and not with so much input from engineers around the world. By the way, EIGRP converges very quickly too. And it doesn't use load and reliability in its metric by default. Also it passes MTU info around, but MTU isn't part of the metric. In fact, figuring out exactly how a router running EIGRP uses MTU is one of those things that you can't find a specification on. Good discussion! Priscilla [EMAIL PROTECTED] (Kaj J. Niemi) wrote: > > In mail.net.groupstudy.pro, you wrote: > > > I have been using EIGRP for our routing protocol for the > last couple years, > > which is prettly great. The controversal of selecting the > routing protocol > > came up again recently. I would like to have your opinion > on EIGRP vs. > > OSPF, which one is refered? What's the weakness and > advantage? Thanks! > > - OSPF is pretty much supported by all vendors nowadays. > - OSPF calculates a tree from the point of origin using > Dijkstra's > algorithm (SPF) > - OSPF is a link-state protocol, you get really fast > convergence by tuning > the timers > - All area 0 (ie. backbone) routers have a complete overview of > the > network > - Easy to deploy > - By default link-cost is calculated from the bandwidth of the > link > - Only for IP > - Filtering on ABR/ASBR only, between areas preferably > > - EIGRP, although the spec is available, only you usually find > it on only > brand Ci$co routers. > - EIGRP calculates it's view of the world using DUAL (Diffusing > update > algorithm) > - Router stores its neighbors routing tables and queries its > neighbors if > no specific route is found > - It's pretty much a distance-vector protocol with some > features borrowed > from link-state ones. > - Pretty easy to deploy > - Is bugwards compatible with IGRP > - Works with IP and IPX > - Easy to filter and aggregate, on any interface (ie you can do > "areas" > quite easily) > - Takes into account path reliability, loading, MTU, lowest > bandwidth > between destinations, total delay when calculating the best > way of > getting to the destination. > - Enterprise people tend to prefer EIGRP over others because > it's easy to > do ISDN backup with it > > > Most people would nowadays choose OSPF because their CIOs might > want to > keep a second vendor option on the table. Service providers > would probably > choose IS-IS (my favorite) or OSPF. > > > > // kaj > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=62450&t=62419 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
