Slight
clarification. I realized on rereading my post is wasn't quite
accurate. The incoming port need not have an IP address; the IP
address
is usually just for the management module. The fact it shares an
incoming port is co-incidental. In truth all the real work in the
switch
is done with the MAC address of the attached devices and just the management
with the IP address.
None of that
changes
the definition that NetView uses identify a router, nor the fact that router
and switch function can be logically co-resident. It just makes life
more interesting.
Bill
Evans
Tivoli NetView Support
for
DOE
903-301-0057
-----Original
Message-----
From:
Evans, Bill
Sent: Monday, March 22,
2004
3:17 PM
To:
'nv-l@lists.us.ibm.com'
Subject: RE: [nv-l] Routers vs.
Switches
"and IP Forwarding turned on" is the
operant condition. Switches don't forward between IP addresses; they
forward between the incoming port which has an IP address and all the Level
2
ports which have no IP address.
Bill
Evans
Tivoli NetView
Support for DOE
903-301-0057
-----Original
Message-----
From:
Christopher J Petrina [mailto:cjp8@meadwestvaco.com]
Sent: Monday, March 22, 2004 3:00
PM
To:
nv-l@lists.us.ibm.com
Subject: RE: [nv-l] Routers vs.
Switches
How would NV then be able to
differentiate between an actual router and a switch that happens to have a
primary and secondary interface. Since Switches generally only have
one
IP address (in our case two for redundancy) it will always consider these to
be routers then I take it?
-Chris Petrina
|
|
|
"Evans,
Bill" <Bill.Evans@hq.doe.gov>
Sent by:
owner-nv-l@lists.us.ibm.com
03/22/2004 02:42
PM
Please respond to
nv-l |
To: "'nv-l@lists.us.ibm.com'"
<nv-l@lists.us.ibm.com>
cc:
Subject: RE: [nv-l] Routers vs.
Switches |
Almost everything
IP
has a routing table including your desktop. Issue "route print" to see
it.
NetView considers
anything which has multiple IP addresses and IP Forwarding turned on to be a
router.
Bill
Evans
Tivoli NetView
Support for DOE
903-301-0057
-----Original
Message-----
From:
Christopher J Petrina [mailto:cjp8@meadwestvaco.com]
Sent: Monday, March 22, 2004 2:14
PM
To:
nv-l@lists.us.ibm.com
Subject: [nv-l] Routers vs.
Switches
Hello all,
Its it my understanding that
a
device is considered a router if it has a routing table? What I am
trying to find out is how to differentiate a switch from a router. I
use
routers as gateways, however switches are not gateways. But if NV
comes
across a switch which happens to have a routing table (Such as a switch with
an L3 card in it) it will interpret that device as a router and place it as
a
gateway?
Chris Petrina
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