> My config: > interface Ethernet1 > backup delay 0 3 > backup interface BRI0 > > router eigrp 10 > network 172.26.0.0 > > ip route 172.20.20.0 255.255.255.0 10.10.9.5 200 That's too skimpy for a reliable diagnostic. Can you post your whole configuration to the list? (Sanitize as necessary.) A few things you may want to try or check: - I don't think you need the backup statements in that case. What triggers dialing using the BRI isn't e1 going down, but traffic to 172.20.20.0/24 after EIGRP removes the route to that through e1. - Is 10.10.9.5 reachable with e1 down? Does pinging it bring up bri0? - When you say bri0 doesn't come up, do you mean when e1 goes down, when the EIGRP route goes away, or when there's traffic for 172.20.20.0/24 and the route's down? On Mon, 4 Jun 2001, KM Reynolds wrote: > Hi Everyone, > > I need to configure a ISDN link as backup for the primary interface. The > primary interface is Ethernet1. I researched a numbers of books and they > all are talk about serial or frame relay interface as the primary. > I was able to search the archives and I found the identical problem that I > am encountering. The post stated that yes the BRI0 interface can work as a > backup for an ethernet interface. The following is a paste of the post(by > Howard Berkowitz): > > "Yes. The key to the solution is to use a low-overhead routing protocol such > as OSPF or EIGRP as a layer 3 keepalive mechanism." > "Set up OSPF or EIGRP to define a path to the destination using the > Ethernet. Set up a static route with administrative distance greater than > that of the routing protocol (at least 200 is a good idea), with this static > route going to the next hop address of the remote ISDN interface. > If OSPF or EIGRP stop seeing hellos across the Ethernet, they will drop the > route. The static route will now float up into the routing table, and you > will get dial-on-demand routing across the ISDN. When OSPF sees its route > again, after the Ethernet is back up, the Ethernet route will replace the > ISDN in the active routing table, and the inactivity timer on the ISDN will > disconnect it." > > I have followed the instructions, but no luck. When I shutdown the ethernet > interface the BRI0 backup interface will not come up. > The question I have are: > 1. If I administratively shutdown the ethernet interface is that the same as > if I disconnected the cable so that the e1 interface will not see a > keepalive. > 2. I did not see any other treads as to if solution worked. Has anyone run > into this situation and has an answer or suggest anything. > > My config: > interface Ethernet1 > backup delay 0 3 > backup interface BRI0 > > router eigrp 10 > network 172.26.0.0 > > ip route 172.20.20.0 255.255.255.0 10.10.9.5 200 > > Lastly, one of the books (Internetworking & Troubleshooting by C. Long) > stated something about layer 2 and the "no keepalive" option. It didn't go > further on this issue and don't know if I understood it. If someone can > explain, it would be much appreciated. > > Sorry for the long post. TIA -- "Someone approached me and asked me to teach a javascript course. I was about to decline, saying that my complete ignorance of the subject made me unsuitable, then I thought again, that maybe it doesn't, as driving people away from it is a desirable outcome." --Me Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=7041&t=7041 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
