The limit on Cisco routers is 4 Serials in the same subnet... but my
question is:
What problem does that solve? Why would I want/need to do that?
Any thoughts?
Z
>From: "Howard C. Berkowitz" <[EMAIL PROTECTED]>
>Reply-To: "Howard C. Berkowitz" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: Re: Stupid question
>Date: Sat, 31 Mar 2001 10:29:36 -0500
>
>I'll be quite honest and say I haven't done a detailed investigation
>of the IOS implementation restrictions here. My intuition would be
>that IOS has one ARP cache per subnet per physical router, and having
>multiple router ports in the same broadcast subnet confuses the ARP
>mechanism. On a first scan of RFC 1812, I don't see any inherent
>architectural limitation on more than one interface in a subnet on a
>physical router.
>
>I suspect the reason that multiple serial interfaces can work is that
>they don't routinely ARP, since they don't have to resolve MAC
>addresses they don't have.
>
>>However, just in the last few days, we read on this list that serial
>>interfaces can have 2 or more in the same subnet. I think one poster said
>>there was a maximum of 6?
>
>Which would be consistent with the maximum interfaces in load
>sharing. I suspect there are some IOS internal games here, where an
>(internal only) virtual interface describes the next hop for a
>destination to which there is load sharing, and some type of
>recursion takes place (perhaps interacting with a cache) to decide
>which physical interface to use.
>
>These are guesses, however.
>
>>
>>But ethernet interfaces cannot share a subnet.
>>
>>Kevin Wigle
>>
>>----- Original Message -----
>>From: "John Neiberger" <[EMAIL PROTECTED]>
>>To: <[EMAIL PROTECTED]>
>>Cc: <[EMAIL PROTECTED]>
>>Sent: Friday, 30 March, 2001 10:41
>>Subject: Re: Stupid question
>>
>>
>>> This isn't a stupid question, it's a very important point to make. If
>>> you are routing, each interface on the router must be in its own
>>>subnet.
>>> Otherwise routing would not work. If you're bridging, then the
>>>bridged
>>> interfaces are in the same subnet but you don't specifically assign an
>>> IP address to those interfaces.
>>>
>>> I'm guessing that you're really asking the former question: in a
>>> routing situation can two different interfaces be in the same subnet,
>> > and the answer is no.
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