From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Fri Apr 30 2004 - 00:16:24 GMT-3
At 7:16 PM -0400 4/29/04, MMoniz wrote:
>that is why I said IRB or CRB is the only logical answer. Each int goes to
>different lan switch but all host on both switches use the same default
>gateway...which is the BVI int
>
>Only way that makes sense to me!!!
>
>could be wrong but that is my interpretation.
>
>So arp would work because of the BVI, just like in any LAN environment
>having a "real" ip
Good thinking -- that someone is using one router to back up two
switches. While I've seen people try to do that, it needs LOTS of
intelligence in the host to know which NIC to use (e.g., understand
spanning tree), or the host has to send out duplicate traffic on both
interfaces, in a manner that the application understands.
I'm still confused about the problem, unless there is very
substantial software development involved -- which probably makes the
budget large enough to afford redundant routers.
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>Howard C. Berkowitz
>Sent: Thursday, April 29, 2004 7:06 PM
>To: ccielab@groupstudy.com
>Subject: RE: Same IP on E0/0 and E0/1
>
>
>At 6:22 PM -0400 4/29/04, MMoniz wrote:
>>HSRP or VRRP do not put the same IP on the int's...they just use a
>"virtual"
>>address that the physical
>>int assumes. You can still reach each int by their individual address..as I
>>am sure you are aware of
>>
>>not the same thing as having each int have the same IP
>
>some things along these lines have been done in multiprocessor server
>clusters. I'm still trying to understand why someone would want to
>have the same IP address on two separate interfaces of the same
>router, assuming that the goal is not L2 load sharing.
>
>It's often easier to make recommendations when the problem is known,
>as opposed to how to make the router do something that seems very
>undesirable from a protocol and router design perspective. Just as a
>trivial example, how does ARP work if two interfaces have the same IP
>address?
>
>>
>>-----Original Message-----
>>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>>Richard Dumoulin
>>Sent: Thursday, April 29, 2004 6:05 PM
>>To: Howard C. Berkowitz; ccielab@groupstudy.com
>>Subject: RE: Same IP on E0/0 and E0/1
>>
>>
>>For who not ?
>>
>>-----Original Message-----
>>From: Howard C. Berkowitz [mailto:hcb@gettcomm.com]
>>Sent: jueves, 29 de abril de 2004 23:45
>>To: ccielab@groupstudy.com
>>Subject: RE: Same IP on E0/0 and E0/1
>>
>>
>>At 10:22 PM +0100 4/29/04, Richard Dumoulin wrote:
>>>But are not hsrp and vrrp for backing up routers, not interfaces ?
>>
>>For Cisco, yes. And, if the problem is backup, it may be more
>>important to think of different routers rather than different
>>interfaces of the same router. The probability of one interface
>>going down and the other staying up is, from my experience, less than
>>that of losing the whole router.
>>
>>>
>>>-----Original Message-----
>>>From: Howard C. Berkowitz
>>>[<mailto:hcb@gettcomm.com>mailto:hcb@gettcomm.com]
>>>Sent: jueves, 29 de abril de 2004 23:14
>>>To: ccielab@groupstudy.com
>>>Subject: Re: Same IP on E0/0 and E0/1
>>>
>>>
>>>At 12:47 PM -0700 4/29/04, RExpert wrote:
>>>>I need help like right now - BIG Thanks to everyone that responds.
>>>>
>>>>I am trying to put the exact same IP Address on 2 different ethernet
>>>>interfaces. The only thing that I could think of is - interface
>>>>multilink 1, but it is not working, here is my config:
>>>
>>>What problem are you trying to solve by doing this? Some sort of
>>>failover? Respond to a practice question?
>>>
>>>Is this something that HSRP or VRRP could not do?
>>>
>>> >
>>>>interface Multilink1
>>>> ip address 66.106.47.230 255.255.255.252
>>>> ppp multilink
>>>> multilink-group 1
>>>>
>>>>Ethernet 0/0
>>>>
>>>>no ip address
>>>> ip load-sharing per-packet
>>>> no ip mroute-cache
>>>> ppp multilink
>>>> multilink-group 1
>>>>
>>>>Ethernet 0/1
>>>>
>>>>no ip address
>>>> ip load-sharing per-packet
>>>> no ip mroute-cache
>>>> ppp multilink
> >>> multilink-group 1
>>>>
>>>>
>>>>
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