Unfortunately the browser did not get the diagram character right. Diagram should be: (route)- r8 - (eigrp 1) - r7 - (ospf) - r6
r7 - eigrp 1 - r6 r7 runs ospf and eigrp 1 with r6. r7 runs eigrp 1 with r8 r8 redistributes connected interface. The question is with r7. r7 is redistributing ospf to eigrp and vice versa. So route, here is 150.50.3.0/24, should appears in r7 ospf with AD 110, also in r7 eigrp topology with AD 170, thus, in theory, r7 should install the ospf path into forwarding table. Because the next hop of ospf path is r7 itself, so loop starts. That is how i undertand. But in fact, r7 choose eigrp path for its forwarding, which is something confused me. Paul The Long and Winding Road wrote: > Sorry if I am misunderstanding your diagram. Where do you think the loop > should appear? > > Routes originating on R8 would appear as connected, and therefore not be > overwritten by redistribution, Same on R7. > > I guess I am just not seeing what the topology is or where you think the > break should be. > > > ""paul dong so"" wrote in message > news:[EMAIL PROTECTED] > >>Hi All, >> >>Practicing redistribution. >> >>(route) - r8 - (eigrp) - r7 - ospf- r6 >>| | >>------- eigrp -------- >> >>150.50.3.0/24 is redistributed by r8 eigrp, r8 advertises it to r7 via >>eigrp. R7 redistributes eigrp to ospf, also redistribute ospf to eigrp. >>On r7, ospf database has type 5 LSA for 150.50.3.0/24, AD 110. eigrp >>topology has EX route, AD 170. But r7 routing table use eigrp learned >>path for forwarding. Why? I was expecting a loop. When will a loop >> > created? > >>r6 learns the route from ospf and eigrp, it use ospf as the forwarding >>path, which is expected. >> >>Partial router config: >> >>r8: >>interface Ethernet0 >> ip address 150.50.3.8 255.255.255.0 >>router eigrp 1 >> redistribute connected >> no auto-summary >> >>r8#sh ip route | i 150.50.3.0 >>C 150.50.3.0/24 is directly connected, Ethernet0 >> >>r7: >>router eigrp 1 >> redistribute ospf 1 metric 56 100 255 1 1500 >>router ospf 1 >> redistribute eigrp 1 metric-type 1 subnets >> >>r7#sh ip route | i 150.50.3 >>D EX 150.50.3.0/24 [170/46251776] via 150.50.5.69, 01:40:13, Serial4/1 >>r7#sh ip ospf database | i 150.50.3 >>Type-5 AS External Link States >>150.50.3.0 200.0.0.7 796 0x80000003 0x00186A 1 >> >>r7#sh ip route 150.50.3.0 >>Routing entry for 150.50.3.0/24 >> Known via "eigrp 1", distance 170, metric 46251776, type external >> Redistributing via ospf 1, eigrp 1 >> Advertised by ospf 1 metric-type 1 subnets tag 1 >> Last update from 150.50.5.69 on Serial4/1, 01:44:46 ago >> Routing Descriptor Blocks: >> * 150.50.5.69, from 150.50.5.69, 01:44:46 ago, via Serial4/1 >> Route metric is 46251776, traffic share count is 1 >> Total delay is 21000 microseconds, minimum bandwidth is 56 Kbit >> Reliability 255/255, minimum MTU 1500 bytes >> Loading 1/255, Hops 1 >> >>r6 >>r6#sh ip route | i 150.50.3.0 >>O E1 150.50.3.0/24 [110/30] via 150.50.7.7, 01:19:53, Ethernet0 >>r6#sh ip ospf database >>Type-5 AS External Link States >>150.50.3.0 200.0.0.7 927 0x80000003 0x186A 1 >> >> >>Thanks >> >>Paul Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=65974&t=65962 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
