I don't think hold down timers prevent triggered updates from taking effect immediately. Once the route is poisoned, the hold down timers prevent a router from marking route as back up for xx seconds. I think the exception to that is if a route comes in that is better than the one that was originally poisoned out, it will be accepted - regardless of the status of the hold down timer.
Try taking the route out and putting it back up right away. See how long it takes before it shows back up. Pierre-Alex GUANEL wrote: > > PROBLEM: > > I wanted to test whether the holddown timers of RIP work. The > all in one > CCIE guide say that hold-down timers in RIP are not used by > default. > > > > EXPERIMENT : > > > I setup p1-r1, and p1-r3 with RIP using the Default timers: > > Configuration on p1-r1 was: (router rip, network 10.0.0.0) > Configuration on p1-r3 was (router rip, network 10.0.0.0) > > diagram: > > > (s1) > . > . > (s3)...p1-r1..(s2).......(s0)..p1-r3..(s1)......... 10.1.100.0/24> > . > .(s0) > > > OBSERVATIONS: > > > Part I: At 8:46 p1-r1 knows about network 10.1.100.0/24 > > Part II: At 8:47 serial 1 is shut on router p1-r3. p1-r3 > sends a poisoned route to p1-r1 via s0 > > Part III: 10 seconds later I check the routing table and the > route to > 10.1.100 was already GONE! > > > CONCLUSION: It looks like the holddown timers did not kick in! > > > I am puzzled. When doing a show ip protocols, I do have > holddown timers set > to 180 seconds! > > Can someone explain? > > > DATA: > > ------------------------Part > I------------------------------------------- > Jan 28 08:46:59: subnet 10.1.100.0 metric 2 > p1-r1#sh ip route > Codes: C - connected, S - static, I - IGRP, R - RIP, M - > mobile, B - BGP > D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF > inter area > N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external > type 2 > E1 - OSPF external type 1, E2 - OSPF external type 2, E > - EGP > i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - > IS-IS inter > area > * - candidate default, U - per-user static route, o - ODR > P - periodic downloaded static route > > Gateway of last resort is not set > > 10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks > S 10.0.0.2/32 is directly connected, Serial3 > C 10.1.3.0/24 is directly connected, Serial2 > C 10.1.2.0/24 is directly connected, Serial1 > C 10.1.1.0/24 is directly connected, Serial0 > C 10.1.0.0/24 is directly connected, Serial3 > R 10.1.100.0/24 [120/1] via 10.1.3.2, 00:00:09, Serial2 > p1-r1# > R0>3 > ------------------------Part > II-------------------------------------------- > > p1-r3(config-if)#shut > p1-r3(config-if)# > R0>1 > [Resuming connection 1 to p1-r1 ... ] > > Jan > Jan 28 08:47:17: RIP: received v1 update from 10.1.3.2 on > Serial2 > Jan 28 08:47:17: 10.1.100.0 in 16 hops (inaccessible) > p1-r1# > Jan 28 08:47:19: RIP: sending v1 flash update to > 255.255.255.255 via Serial0 > (10.1.1.1) > Jan 28 08:47:19: RIP: build flash update entries > Jan 28 08:47:19: subnet 10.1.100.0 metric 16 > Jan 28 08:47:19: RIP: sending v1 flash update to > 255.255.255.255 via Serial1 > (10.1.2.1) > Jan 28 08:47:19: RIP: build flash update entries > Jan 28 08:47:19: subnet 10.1.100.0 metric 16 > Jan 28 08:47:19: RIP: sending v1 flash update to > 255.255.255.255 via Serial2 > (10.1.3.1) > Jan 28 08:47:19: RIP: build flash update entries > Jan 28 08:47:19: subnet 10.1.100.0 metric 16 > Jan 28 08:47:19: RIP: sending v1 flash update to > 255.255.255.255 via Serial3 > (10.1.0.2) > p1-r1# > Jan 28 08:47:19: RIP: build flash update entries > Jan 28 08:47:19: subnet 10.1.100.0 metric 16 > ------------------------ Part III > ---------------------------------- > > Jan 28 08:47:28: > p1-r1#sh ip route > Codes: C - connected, S - static, I - IGRP, R - RIP, M - > mobile, B - BGP > D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF > inter area > N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external > type 2 > E1 - OSPF external type 1, E2 - OSPF external type 2, E > - EGP > i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - > IS-IS inter > area > * - candidate default, U - per-user static route, o - ODR > P - periodic downloaded static route > > Gateway of last resort is not set > > 10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks > S 10.0.0.2/32 is directly connected, Serial3 > C 10.1.3.0/24 is directly connected, Serial2 > C 10.1.2.0/24 is directly connected, Serial1 > C 10.1.1.0/24 is directly connected, Serial0 > C 10.1.0.0/24 is directly connected, Serial3 > > > p1-r1# > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=33440&t=33426 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
