having the interfaces track one another was in fact the secret sauce that made it work. i can pull any of the links and it contines to ping with minimal interruption.
cheers! ----- Original Message ----- From: John Neiberger Date: Friday, March 7, 2003 11:42 am Subject: Re: it started out as a really good idea ... [7:64638] > That's an excellent point. With this design you run a risk of > asymmetrical routing. To solve this, in the HSRP configuration on > eachrouter have the e0 interface track the e1 interface and vice- > versa. > That way, if you pull a cable on one side, this triggers failover on > both sides. > > Give that a shot, I think it will work. > > John > > >>> "Priscilla Oppenheimer" 3/6/03 4:23:46 PM > >>> > Um, he already has both the E0s in the same subnet and both the > E1s in > the > same subnet, according to his config. > > His drawing is confusing but I think he's got PC1 and both E0s in > subnet > 10.3.0.0/16, say on a hub or a switch. > > He's got PC2 and both E1s in subnet 10.4.0.0, on another hub or > switch. > > If the problem isn't related to misconfiguration of the default > gatewayon > the PCs, I do have another theory. :-) > > Say he pulls the E0 cable on Router 1. No problem, PC1 will start > using > Router2. > > Then he pings from PC1 to PC2. The ping will probably get there but > what > about the reply coming back? > > What happens if PC2 is using Router 1 and Router 1 has no way to send > PC2's > packet from itself to Router 2 due to the missing cable, not to > mentionlack > of any routing protocol configured. > > Think about it! :-) > > Priscilla > > The Long and Winding Road wrote: > > > > ""garrett allen"" wrote in message > > news:[EMAIL PROTECTED] > > > i have a need for a high availability solution for a default > > gateway > > > configuration. just finished the ccdp and thought it might be > > > interesting to try hsrp on a pair of 2514's. put some of > > that theory > > > to work. instead of highly resiliant i've managed to > > configure it for > > > mass failure. arg.., not exactly what i had in mind. now, > > any time i > > > take down 1 of the 4 links, the connect between 2 remote > > hosts dies. > > > this is in a lab (production is not a lab, production is not > > a lab...) > > > so it is a mystery i would like to solve, but it is not > > critical. > > > > > > here is the basic config (hope it makes it): > > > > > > pc host 1 -----+----- e0 router 1, e1 ----+--------- pc > > host 2 > > > | | > > > |----- e0 router 2, e1 ----| > > > > > > the routers act as a default gateway between the internal > > network > > > (represented by pc host 1) and the external world > > (represented by pc > > > host 2). i have used 10.3 and 10.4 /16 as the addresses for > > each side > > > of the divide. i want to run hsrp on both sets of router > > interfaces so > > > that in the event a router or an interface fails, the traffic > > impact is > > > minimized. in the real world pc host 2 will be a firewall > > and there > > > will be other hosts off that segment as well > > > > > > looks easy. sounds plausible. read the cisco docs. looks > > like it > > > should work. minimal incantations before tickling the > > keyboard. key > > > in the configs and it fires up nicely. do the show standby > > thingee and > > > all looks cool. can ping the 2 stations end to end. most > > excellent. > > > put a router in debug mode. when i pull one of the 4 router > > cables the > > > router goes through a state change but no bits make it to the > > far end. > > > not even the shiney ones. bitstream courtesy of ping. > > > > > > maybe i misunderstood what hsrp was suppose to do. the > > configs are > > > below, along with the show standby results. both are 2514's > > (2 aui's) > > > and both are running 12.2(1d). probably forgot to put the > > interface in > > > mumble mode or something equally easy. no laughter, please. > > > > > > HSRP assumes the ehternet interfaces to be on the same subnet. > > your ehternet > > side is on two different subnets. hence - no failover. > > > > to get this to work using 2514's: > > > > > > E0----------2514_1-----------E1 > > > > E0----------2514_2-----------E1 > > > > > > the e0's on the same subnet, the e1's on the same subnet > > > > > > > > > > > > > > thanks in advance. > > > > > > router 1 > > > interface Ethernet0 > > > ip address 10.3.255.2 255.255.0.0 > > > no ip route-cache > > > no ip mroute-cache > > > standby 1 priority 200 preempt > > > standby 1 ip 10.3.0.2 > > > ! > > > interface Ethernet1 > > > ip address 10.4.254.2 255.255.0.0 > > > no ip route-cache > > > no ip mroute-cache > > > standby 2 priority 200 preempt > > > standby 2 ip 10.4.254.10 > > > > > > > > > router 2 > > > interface Ethernet0 > > > ip address 10.3.255.1 255.255.0.0 > > > no ip route-cache > > > no ip mroute-cache > > > standby 1 priority 225 preempt > > > standby 1 ip 10.3.0.2 > > > ! > > > interface Ethernet1 > > > ip address 10.4.254.1 255.255.0.0 > > > no ip route-cache > > > no ip mroute-cache > > > standby 2 priority 150 preempt > > > standby 2 ip 10.4.254.10 > > > > > > results of show standby > > > Router1#show standby > > > Ethernet0 - Group 1 > > > Local state is Standby, priority 200, may preempt > > > Hellotime 3 holdtime 10 > > > Next hello sent in 00:00:00.940 > > > Hot standby IP address is 10.3.0.2 configured > > > Active router is 10.3.255.1 expires in 00:00:09, priority > > 225 > > > Standby router is local > > > 20 state changes, last state change 00:22:34 > > > Ethernet1 - Group 2 > > > Local state is Active, priority 200, may preempt > > > Hellotime 3 holdtime 10 > > > Next hello sent in 00:00:01.676 > > > Hot standby IP address is 10.4.254.10 configured > > > Active router is local > > > Standby router is 10.4.254.1 expires in 00:00:08 > > > Standby virtual mac address is 0000.0c07.ac02 > > > 17 state changes, last state change 00:23:26 > > > Router1# > > > > > > Router2#show standby > > > Ethernet0 - Group 1 > > > Local state is Active, priority 225, may preempt > > > Hellotime 3 holdtime 10 > > > Next hello sent in 00:00:01.010 > > > Hot standby IP address is 10.3.0.2 configured > > > Active router is local > > > Standby router is 10.3.255.2 expires in 00:00:09 > > > Standby virtual mac address is 0000.0c07.ac01 > > > 24 state changes, last state change 00:22:04 > > > Ethernet1 - Group 2 > > > Local state is Standby, priority 150, may preempt > > > Hellotime 3 holdtime 10 > > > Next hello sent in 00:00:01.272 > > > Hot standby IP address is 10.4.254.10 configured > > > Active router is 10.4.254.2 expires in 00:00:09, priority > > 200 > > > Standby router is local > > > 32 state changes, last state change 00:22:25 > > > Router2# > Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=64742&t=64638 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
