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Posted by wubing on June 19, 2007, 1:19 pm
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Scott Perry wrote:
> PRO - You can still have two IP address ranges functioning on a switch
> without VLANs if your switch cannot use VLANs.
> PRO - The IP hosts in one subnet cannot directly unicast to the IP hosts in
> the other subnet.
> PRO - Your router for these subnets can use the "ip address W.X.Y.Z W.X.Y.Z
> secondary" command to provide a default gateway IP addres for each
> additional subnet on the same interface. That's right, you can have
> multiple secondary IP addresses.
>
> CON - This is not why subnets were invented. These two subnets are supposed
> to be on different LAN segments.
> CON - The broadcasts from either subnet will be present in the same
> broadcast domain. Multicasts, if present, will be the same.
> CON - Your router interface throughput will be more heavily loaded. Hosts
> must send data into the router interface for it to be sent right back out to
> a host in the same LAN segment. This would still be the case if the router
> had a VLAN trunk to the switch, but at least more capabilities would be
> available.
>
> If the destination IP address is within the sending hosts IP address range,
> the data is sent with the destination IP address in the IP packet and the
> destination MAC address in the ethernet frame.
>
> If the destination IP address is not within the sending hosts IP address
> range, the data is sent with the destination IP address in the IP packet and
> the default gateway router MAC address in the ethernet frame.
> The router would then receive the frame, discard the frame to examine the IP
> packet inside, see the destination IP as some other IP address (as opposed
> to someone telnetting directly to the router for administration), re-wrap
> the IP packet with an ethernet frame destined to the next hop router, and
> forward the frame.
> This repeats until the last router connected to the destination host subnet
> sends the IP packet wrapped in an ethernet frame with the destination hosts
> MAC address on the frame and the destination host receives it.
>
> ===========
> Scott Perry
> ===========
> Indianapolis, Indiana
> ________________________________________
>
>> wubing wrote:
>>
>> >One simple question, can I use 2 subnets on 1 switch without VLAN setup.
>> >What is the Pros and Cons?
>>
>> Yes, you can. It will work and the main difference is that broadcast of
>> either network will be visible in the other one.
>>
>> Regards
>>
>> fw
>
>
What about two routers, two subnets and one switch?
--
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