Ya Jason, that seems to be the issue. The border routers will have routes to the network via both OSPF and EIGRP. I don't know where my mind was :)
Thanks On Sun, Feb 20, 2011 at 9:44 PM, Jason Maynard <[email protected]>wrote: > 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
