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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