OSPF selects based on type of route first (intra-area, then inter-area, then external). If there's a tie, it goes based on cost value. If there's a tie there, it goes based on the cost of the path to the router-id of the injecting router. When doing redistribution, you can use a route-map and "set ip next-hop". HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al. CCSI/JNCI-M/JNCI-ER VP - Technical Training - IPexpert, Inc. IPexpert Sr. Technical Instructor A Cisco Learning Partner - We Accept Learning Credits! [EMAIL PROTECTED] Telephone: +1.810.326.1444 Fax: +1.810.454.0130 http://www.ipexpert.com _____ From: Per Helm [mailto:[EMAIL PROTECTED] Sent: Wednesday, February 27, 2008 10:35 AM To: [EMAIL PROTECTED]; [email protected] Subject: RE: [OSL | CCIE_RS] OSPF distance for specific prefix form specificneighbor OK, thanks, then thats perfectly clear! And in that case, is there any way in R2 acting as FR hub without any subinterface (ospf network-type broadcast without neighbor statements), to prefer the path to 13.13.11.11/32 via R5 before R4? Or is the only option to influence the path in R2, when doing the redistribution in R5? Best regards Per > From: [EMAIL PROTECTED] > To: [EMAIL PROTECTED]; [email protected] > Subject: RE: [OSL | CCIE_RS] OSPF distance for specific prefix form specificneighbor > Date: Wed, 27 Feb 2008 09:23:04 -0500 > > Administrative distance is not used to select between two paths within the > same protocol. You'll need to use metrics of some sort to work on this. > > AD change is only done AFTER OSPF selects its best path, so you could prefer > over EIGRP or some other protocol if you wanted. > > HTH, > > > Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE-M > #153, JNCIS-ER, CISSP, et al. > CCSI/JNCI-M/JNCI-ER > VP - Technical Training - IPexpert, Inc. > IPexpert Sr. Technical Instructor > > A Cisco Learning Partner - We Accept Learning Credits! > > [EMAIL PROTECTED] > > > > Telephone: +1.810.326.1444 > Fax: +1.810.454.0130 > http://www.ipexpert.com > > > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Per Helm > Sent: Wednesday, February 27, 2008 5:09 AM > To: [email protected] > Subject: [OSL | CCIE_RS] OSPF distance for specific prefix form > specificneighbor > > > > Hi all, > > > I'm confused regarding setting ospf distance for a specific prefix from a > specific neighbor (router-id) in OSPF. I have the same equal-cost prefix > (13.13.11.11/32) in R2, from two OSPF neighbors R4 (rid 13.134.4) and R5 > (rid 13.13.5.5) The network between the three is frame-relay, ospf > network-type broadcast. What I want to do in R2 is to prefer the path to > 13.13.11.11 via 13.13.5.5 by influencing the distance for this prefix from > this particular neighbor. The two routers R4 and R5 have the 13.13.11.1/32 > from internal EIGRP, and redistributes this to OSPF. R2 is only running > OSPF. > > > The routing-table for this prefix in R2 before manipulating the distance; > > > R2#sh ip ro 13.13.11.11 > Routing entry for 13.13.11.11/32 > Known via "ospf 1", distance 110, metric 20 Tag 2, type extern 2, forward > metric 195 Last update from 13.13.9.5 on Serial0, 00:00:09 ago Routing > Descriptor Blocks: > 13.13.9.5, from 13.13.5.5, 00:00:09 ago, via Serial0 Route metric is 20, > traffic share count is 1 Route tag 2 > * 13.13.9.4, from 13.13.4.4, 00:00:09 ago, via Serial0 Route metric is 20, > traffic share count is 1 Route tag 2 > > > R2#sh ip ospf neig > > > Neighbor ID Pri State Dead Time Address Interface > 13.13.4.4 0 FULL/DROTHER 00:00:37 13.13.9.4 Serial0 > 13.13.5.5 0 FULL/DROTHER 00:00:34 13.13.9.5 Serial0 > > > Now I'm reconfiguring R2 according to the below; > > > router ospf 1 > distance 50 13.13.5.5 0.0.0.0 2 > > access-list 2 permit 13.13.11.11 > > The routing-table in R2 for this prefix after manipulating the distance; > > R2#sh ip ro 13.13.11.11 > Routing entry for 13.13.11.11/32 > Known via "ospf 1", distance 50, metric 20 Tag 2, type extern 2, forward > metric 195 Last update from 13.13.9.5 on Serial0, 00:00:08 ago Routing > Descriptor Blocks: > 13.13.9.5, from 13.13.5.5, 00:00:08 ago, via Serial0 Route metric is 20, > traffic share count is 1 Route tag 2 > * 13.13.9.4, from 13.13.4.4, 00:00:08 ago, via Serial0 Route metric is 20, > traffic share count is 1 Route tag 2 > > Now as you can see the distance for this prefix has changed to 50, but I > still do have equal-cost via both of the neighbors!!?? > > > How come R2 is not prefering the prefix from R5 before the path via R4? > > > Thanks in advance and Best Regards > > > > > _________________________________________________________________ > Spara, redigera och organisera dina foton enkelt med Photo Gallery! > http://get.live.com/photogallery/overview= > _____ Du har väl läst dagens Nemi? MSN Serier <http://msnse.microsoft.se/serier/nemi/>
