never any offense in the search for truth, just truth. the pc's are configured with the virtual router as the default gateway. i checked the arp cache on the pc's (w2k) with arp -a before i unplugged, during the unplug time, and afterwards. the mac address remained the same, which is to say the 00000c... virtual mac address that cisco uses. it is different than the bia on the interfaces and when doing a show interfaces you can see which interface has the virtual mac address since its hardware address is different than its bia.
i read through a tac article last nite that may hold a clue. it suggests using the bia as the virtual mac address via the "standby use- bia". it stipulated that even though the pc uses the virtual mac address return packets will bear the bia of the router as the source mac. it is a function of the lower end cisco gear and how many mac addresses they can have. these are 2514's. i haven't fully thought through the ramifications of this but have found in practice that asymmetry usually leads to bad juju, so changing the mac may help by making things consistent. it did caution that some end stations may not play well when the mac changes, but a gratuitous arp was sent. so we'll see today. i hesitated to post the traces as they were rather large. i will do so later today with fresh traces unless someone objects about the noise volume. if so i can send offline to whomsoever is interested. i've never worked with hsrp so i am interested in getting it resolved and understanding the why's of unsuccessful and successful operation. like i said in the beginning, it seemed like a really good idea... cheers for now (off to the salt mines ...) garrett ----- Original Message ----- From: Troy Leliard Date: Friday, March 7, 2003 4:46 am Subject: RE: it started out as a really good idea [7:64636] > Looks like you have it configured correctly, and that they are forming > "adjacencies". At the risk of offending, but always best to start > right at > the beginning, the gateway on your hosts are set to the HSRP > address correct? > > When you unplug any of the 4 cables, you can no longer ping the > either side > of the host. Perhaps give us a debug standby during one of these > events ? > > > garrett allen wrote: > > > > 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. > > > > 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=64705&t=64636 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
