Hi, I noticed the same behavior with EIGRP and ISIS. The explanation I made is that the router is right. Indeed, the directly connected route is not learned by ISIS (because it is directly connected :-)). This is always a question, if to redistribute directly connected subnets or to include the ISIS interface also under OSPF and make it passive. In the latter case, no redistribution is necessary, but there are other issues... that must be resolved bu manipulating the distance of some networks.
As a conclusion, I prefer redistributing connected subnets. Am I right? Mojza Jason Viera wrote: > I have searched high and low for an explanation as to why I occasionally > have problems when redistributing, if I don't use a redistribute connected > statement and try to use the IGP to advertise a connected network. Hopefully > I don't confuse anyone or myself, but here is the issue I ran into > yesterday. This is a small part of the topology where I was having the > issue. > > > OSPF OSPF > R1---------------------R2 > ISIS ISIS > > So basically I have two routers that I have both OSPF and ISIS running on, > after completing my mutual redistribution I noticed that the OSPF database > did not contain a Type 5 LSA for the physical interface that is connected to > the ISIS domain(on R1 and R2), I falsely assumed that by mutually > redistributing I would have no problem passing that network into the OSPF > domain, but it didn't work. So I used the redistribute connected with a > route map on both routers and I then had the route. I have seen this before, > but am perplexed by the fact that I don't understand why the initial > redistribution didn't work in this case. Please enlighten me! > > Thanks, Jason > **Please support GroupStudy by purchasing from the GroupStudy Store: > http://shop.groupstudy.com > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=74490&t=74447 -------------------------------------------------- **Please support GroupStudy by purchasing from the GroupStudy Store: http://shop.groupstudy.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html