OK, just got through testing out on of the complex exercises found in the Slattery/Burton book Advanced IP Routing in Cisco Networks. I truly love this book, despite the number of technical errors I continue to find. I still recommend it, particularly with the new edition, which I believe should be on the shelves now. In any case, the scenario is redistribution between an EIGRP domain and an OSPF domain. And the sticking point for me has been a summary route that appears to have been redistributed back into the EIGRP domain after being distributed into the OSPF domain. EIGRP_Domain---------------Redistribution_Router--------------------------OS PF_Domain 182.18.x.y networks mutual redistribution takes place here 172.16.x.y networks I had no problems with the redistribute commands. I understood the purpose of the distribute-list command under the OSPF routing process, which was to keep the OSPF 172.16 networks from being advertised back into OSPF after being redistributed into EIGRP But....... The book solution to the exercise: router eigrp 200 redistribute ospf 100 metric 125 2000 255 1 1500 network 182.18.0.0 no auto-summary ! router ospf 100 summary-address 182.18.0.0 255.255.0.0 redistribute eigrp 200 metric 400 subnets network 172.16.0.0 0.0.255.255 area 0 distribute-list 4 out ! ip classless ! access-list 4 deny 172.16.0.0 0.0.255.255 access-list 4 permit any This, however, left the summary address 182.18.0.0 appearing back on the EIGRP side of things. I assumed this was a leak and a potential loop. Things were OK as far as I could tell, in that I was still able to ping all routers from all routers. More specific routes existed in the EIGRP routing tables, so packets were not black holed, even though there was a null0 entry on the routing table. My solution to kill the 182.18.0.0 summary network on the EIGRP side was: router eigrp 200 redistribute ospf 100 metric 125 2000 255 1 1500 network 182.18.0.0 distribute-list 5 out <---------Add this line no auto-summary ! access-list 5 deny 182.18.0.0 <-------add this access-list access-list 5 permit any <-------add ( continued ) ! In any case, there appear to be a number of subtleties with regards to redistribution that I had not understood before. It is always good to have good coaching. Chuck ---------------------- I am Locutus, a CCIE Lab Proctor. Xx_Brain_dumps_xX are futile. Your life as it has been is over ( if you hope to pass ) From this time forward, you will study US! ( apologies to the folks at Star Trek TNG ) _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
