Multiple "ip helper-address" on an interface has been supported for a long time. There is no sequential order per se. The UDP broadcast packet is converted to a unicast and sent to each address listed by a helper. I would recommend using a sniffer on the target network to ensure you are getting both helpered packets.
You might be hitting an IOS bug, but a quick scan didn't turn up any good hits... Chris ""Elijah Savage"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Seeing the other ip helper question made me think of what I was working on > in my lab. On Friday morning I get into work and there was a severity 1 > ticket where about 800 employees could not log in. We discovered that one > of the dhcp servers was down but we have 2 so in theory all should have > been fine, on all of our routers we have both dhcp servers for ip helper. > From reading some place in my long journey I am sure I read that ip helper > would take a broadcast and change it to unicast and send traffic to all ip > helper addresses regardless if it is down or not. But in this case that > did not happen. To get everything back up I actually had to change the > order that I had the ip helper addresses in. The server that was down I > put it last and put the server that was up first and then everything > started to work. So it seems as if some primary secondary thing is going > on here. We are running ospf on our backbone with a variety of equipment > configurations 6500's 5500's 3600's 2600's. All routers has a different > version of IOS we have not had a chance to bring them all up to the same > code what is similiar is they all have at least 12.0 on them. I want to > try and figure this out myself so I started playing with this in the lab > with 2600's running 12.1(5) IOS and I came across the same exact thing. > Did this change with IOS 12 or something has anyone else experienced this? Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=45051&t=45045 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
