I will throw this out there I believe you still allow the static route that is redistributed into EIGRP with an AD distance 170 to be redistributed into OSPF. This will then have an administrative distance of 110 - between the route from OSPF (AD110) and the route from EIGRP (AD170) the OSPF route wins. This has to do with the administrative distance deciding who is going to end up into the routing table.
The filtering you are doing will prevent loops but not on R6 as the router is looking at the administrative distance to make its decision (EIGRP route of 170 vs. OSPF of 110) I hope I got this right :P -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Daniel Gheorghe Sent: February-20-11 1:36 PM To: [email protected] Subject: [OSL | CCIE_RS] WB 2 Lab 8 - Redistribution Hi, In Lab8 WB2 we have a topology like this: R2 / \ / OSPF \ / \ R5 ----------- R6 | EIGRP | | R7 | | static to 10.0.0.8 | R8 Full reachability is asked so we must redistribute between EIGRP and OSPF on R5 and R6 and redistribute static in EIGRP on R7. The DSG suggests using the distance command on R5 and R6 to increase the AD in router ospf between them in order to avoid routes generated in EIGRP to be preferred coming in from OSPF, but I think it should work just as well with route tags, like below: R7: ip route 10.0.0.8 255.255.255.255 172.30.78.101 router eigrp 1 redist static metric 1 1 1 1 1500 R5, R6: route-map O2E deny 10 match tag 90 route-map O2E permit 20 set tag 110 route-map E2O deny 10 match tag 110 route-map E2O permit 20 match route-type internal external set tag 90 router ospf 1 redist eigrp 1 subnets route-map E2O router eigrp 1 redist ospf 1 metric 1 1 1 1 1500 route-map O2E The 10.0.0.8 route is the Lo1 of R8 and R7 has a static route to it. It is redistributed into EIGRP and SHOULD be preferred as a D EX route on R5 and R6... except it isn't. It is preferred through EIGRP just on one router. R5#sho ip route 10.0.0.8 Routing entry for 10.0.0.8/32 Known via "eigrp 1", distance 170, metric 2560002816, type external Redistributing via ospf 1, eigrp 1 Advertised by ospf 1 subnets route-map E2O Last update from 172.30.200.7 on FastEthernet0/0, 00:13:06 ago Routing Descriptor Blocks: * 172.30.200.7, from 172.30.200.7, 00:13:06 ago, via FastEthernet0/0 Route metric is 2560002816, traffic share count is 1 Total delay is 110 microseconds, minimum bandwidth is 1 Kbit Reliability 1/255, minimum MTU 1500 bytes Loading 1/255, Hops 1 R6#sho ip route 10.0.0.8 Routing entry for 10.0.0.8/32 Known via "ospf 1", distance 110, metric 20 Tag 90, type extern 2, forward metric 128 Redistributing via eigrp 1 Last update from 172.30.100.2 on Serial0/1/0, 00:08:20 ago Routing Descriptor Blocks: * 172.30.100.2, from 5.5.5.5, 00:08:20 ago, via Serial0/1/0 Route metric is 20, traffic share count is 1 Route tag 90 I am sure I am missing something in this scenario so please fell free to come with suggestions _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
