On Wed, Jul 29, 2009 at 10:38:43AM +0300, Ivo Chutkin wrote: > Hallo Misc, > > I need some general clarification about OSPF and BGP behavior. > > I have tow border routers, border1(OpenBSD4.4 - stable)and > border2(OpenBSD4.4 -stable), and one core router, core1(OpenBSD4.5 - > stable). > Each border router talk eBGP(full feeds) with one upstream provider > and have iBGP session between them. No problems here. > > The two borders and the core have ospf session to each other in one area. > Border routers redistribute default to core1. > Core1 redistribute connected to borders. > No problems here as well. > > I noticed something strange though. > I start mtr to ibm.com for exampe, on the core1, I get different > result every time I issue the command. See the attached results. >
:~> host ibm.com ibm.com has address 129.42.18.103 ibm.com has address 129.42.16.103 ibm.com has address 129.42.17.103 :~> bgpctl show rib 129.42.16.0/22 all flags: * = Valid, > = Selected, I = via IBGP, A = Announced origin: i = IGP, e = EGP, ? = Incomplete flags destination gateway lpref med aspath origin I*> 129.42.16.0/24 62.153.202.177 100 1000 3320 3356 14904 16807 i I*> 129.42.17.0/24 62.153.202.177 100 1000 3320 701 15006 16807 i I*> 129.42.18.0/24 62.153.202.177 100 1000 3320 3356 2140 16807 i I*> 129.42.19.0/24 62.153.202.177 100 1000 3320 3356 14904 16807 i It resolves to three different IPs in three different networks connected to three different upstreams no wonder the trace is different every time. -- :wq Claudio
