I thought of one workaround but I don't know if it would work. Use a loopback interface. Perhaps OSPF would use the address in a way that would meet your needs. Then, would IOS let you say that the HSRP address is the loopback address also?? That's the part that I don't have time to test.
It may be an off the wall suggestion, but your question is sort of off the wall too!? ;-) Priscilla Priscilla Oppenheimer wrote: > > Gil Shulman wrote: > > > > Hi all, > > > > I know that I asked this question in the past, but I still > have > > some problem > > with this issue. > > What I am trying to do is as follows: > > > > Site A | > > Site B > > > > ______802.1q____________________ > > _____________ ________|_____ | _____________ > > _____|_________ > > > > | SW-L3 |------| SW - L2 | | | SW - > L3 > > |-----| SW - L2 | > > |____________|------|_____________| | > > |____________|-----|_____________| > > / / | > > / / > > / / | > > / / > > / / | > > Vlan2 / /Vlan3 > > / Vlan3 / / > > / > > Vlan 2 / / > > / / > > / / > > / / > > _____________/______/ > > ____/__________/____ > > | | | > > | > > | Host A > > | | > > Host B | > > |__________________| > > |___________________| > > > > > > The L-3 at site A and B holds two HSRP IP addresses for each > > Vlan, Vlan 2 & > > Vlan 3. > > Host A & B don't hold a static default gateway configuration, > > they are > > running an OSPF process and should learn their default gateway > > IP address > > via OSPF advertisements. > > Is it custom software or something? What ARE Host A and Host B? > In general, IP hosts don't learn the default gateway from a > routing protocol. AppleTalk and DECnet work that way. And a > Novell IPX host learns about a router from the GetNearestServer > interaction. But IP generally doesn't work that way. Instead, > you manually configure a default gateway (or let the host learn > it via DHCP). This has the obvious disadvantage that the > default gateway could go down. That's why HSRP was invented. > HSRP deals with the first hop workstation-to-router connection, > in the control plane. OSPF and routing protocols deal with > router-to-router paths in the management plane. > > A host can also learn about other routers through ICMP > redirects. On a PC, you can isuse a "route print" command to > verify whether a host has learned more than one way out, i.e. > more than one workstation-to-router connection. > > Another alternative for IP workstation-to-router communication > is the Router Discovery Protocol (RDP). RFC 1256 specifies the > RDP extension to ICMP. With RDP, each router periodically > multicasts an ICMP router advertisement packet from each of its > interfaces, announcing the IP address of that interface. > Workstations discover the addresses of their local routers > simply by listening for advertisements, in a similar fashion to > the method AppleTalk workstations use to discover the address > of a router. > > When a workstation starts up, it can multicast an ICMP router > solicitation packet to ask for immediate advertisements, rather > than wait for the next periodic advertisement to arrive. > > Now, you may have a custom operating system or custom software > that doesn't behave in the normal IP way, in which case, you > need to tell us more about your situation. > > > The question is, how can I advertise an HSRP IP address via > > OSPF routing > > protocol. > > I have been trying to achieve it by using the > > "default-information originate > > always" but the default gateway which the hosts gets is the > > real IP address > > of the interface. > > Perhaps the IOS developers never considered this a requirement > and never made it possible to advertise the virtual HSRP > address in an OSPF packet, since they solve two different > problems. There may be a workaround, but I can't find one. > > Once again, I have to ask, what ARE these hosts? If they can > talk OSPF, why don't you just let them use OSPF? OSPF can be > designed to support the redundancy that you require. OSPF has > support for quick convergence. HSRP solved a different problem, > which was that IP, despite good routing protocols, didn't > support quick convergence for the workstation-to-router > first-hop problem. > > Priscilla > > > > > Help will be most appreciated. > > > > Cheers, > > Gil > > > ************************************************************************************************** > > The contents of this email and any attachments are > confidential. > > It is intended for the named recipient(s) only. > > If you have received this email in error please notify the > > system manager or the > > sender immediately and do not disclose the contents to any one > > or make copies. > > > > ** eSafe scanned this email for viruses, vandals and malicious > > content ** > > > ************************************************************************************************** > > > > > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=50637&t=50626 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
