On 3/15/21 3:28 PM, Carlos E.R. wrote:

>
> Home routers are not actually "routing" the LAN. The LAN is connected to
> a switch in the "router" box. The router part of the "router" does not
> intervene in that traffic.
>

Neither do enterprise routers. As far as I know, every modern
non-internet-only router connects local traffic to a switch.

You CAN make a particular port "routable" on higher-end routers, but
it's rarely mandatory.

On 5/28/21 2:15 PM, Johann Beretta wrote:
> Neither do enterprise routers.  As far as I know, every modern
> non-internet-only router connects local traffic to a switch.

It depends on what the router is and how it's built.

It's possible to combine ports on some routers into a logical switch,
which will use software to switch the traffic between the ports.

This is very much akin to bridging under Linux. Add two or more ports
to a bridge and use kernel software to do switching.

--
Grant. . . .
unix || die

Grant Taylor <gtaylor@tnetconsulting.net> wrote:
>On 5/28/21 2:15 PM, Johann Beretta wrote:
>> Neither do enterprise routers.  As far as I know, every modern
>> non-internet-only router connects local traffic to a switch.
>
>It depends on what the router is and how it's built.
>
>It's possible to combine ports on some routers into a logical switch,
>which will use software to switch the traffic between the ports.
>
>This is very much akin to bridging under Linux. Add two or more ports
>to a bridge and use kernel software to do switching.

The Bridge - Switch - Router terminology has been fully usurped by
marketdroids in the last two decades. All one can say at the moment,
if it's called router, it probably has not enough ports, and if it's
called l3-switch, it's actually a router with a lot of ports that can
route packets really fast.

A router proper with no switching capability would not be able to have
multiple ports in a single network segment / VLAN.

Greetings
Marc
--
-------------------------------------- !! No courtesy copies, please !! -----
Marc Haber | " Questions are the | Mailadresse im Header
Mannheim, Germany | Beginning of Wisdom " |
Nordisch by Nature | Lt. Worf, TNG "Rightful Heir" | Fon: *49 621 72739834

On 5/29/21 10:42 AM, Marc Haber wrote:
> The Bridge - Switch - Router terminology has been fully usurped by
> marketdroids in the last two decades.

Only if we don't call them to the mat and use the proper terms ourselves.

> All one can say at the moment, if it's called router, it probably
> has not enough ports, and if it's called l3-switch, it's actually a
> router with a lot of ports that can route packets really fast.

I've used many big iron routers that are a LOT faster than even 10 / 25
/ 40 / 50 Gbps L3 switches. Big iron routers really start to shine when
you need to do more than simple L3 routing between simple Ethernet
segments. When you want to do more advanced things and / or have a full
routing table* is when you actually /need/ a big iron router.

Current Default Free Zone feed that I've got shows 831,432 prefixes.
Many, if not most L3 switches fall over at that scale.

> A router proper with no switching capability would not be able to
> have multiple ports in a single network segment / VLAN.

Sure it can. Cisco calls this a "Bridge Virtual Interface" or a "Switch
Virtual Interface" (depending on the router in question). It uses
software and the CPU to join multiple nominally independent interfaces
into a broadcast domain.

--
Grant. . . .
unix || die

Grant Taylor <gtaylor@tnetconsulting.net> wrote:
>On 5/29/21 10:42 AM, Marc Haber wrote:
>> A router proper with no switching capability would not be able to
>> have multiple ports in a single network segment / VLAN.
>
>Sure it can. Cisco calls this a "Bridge Virtual Interface" or a "Switch
>Virtual Interface" (depending on the router in question). It uses
>software and the CPU to join multiple nominally independent interfaces
>into a broadcast domain.

That is a router with added switching capability.

Thanks for proving my point and for unnecessarily taking this
conversation into a market segment that probably 1 % of people
(including the two of us) will ever see.

--
-------------------------------------- !! No courtesy copies, please !! -----
Marc Haber | " Questions are the | Mailadresse im Header
Mannheim, Germany | Beginning of Wisdom " |
Nordisch by Nature | Lt. Worf, TNG "Rightful Heir" | Fon: *49 621 72739834

On 5/30/21 4:08 AM, Marc Haber wrote:
> That is a router with added switching capability.

What is "switching capability"? Is it hardware as in a switch on a chip
that many SOHO routers have? Or is it some sort of higher end ASIC that
gets into the data path? Or is it software a la bridging on Linux?

> Thanks for proving my point and for unnecessarily taking this
> conversation into a market segment that probably 1 % of people
> (including the two of us) will ever see.

I know a number of people that use BVI / SVI on routers. It's quite
common to logically join a wired and wireless segment and route between
said logical segment and other physical segments.

--
Grant. . . .
unix || die

Grant Taylor <gtaylor@tnetconsulting.net> wrote:
>On 5/30/21 4:08 AM, Marc Haber wrote:
>> That is a router with added switching capability.
>
>What is "switching capability"? Is it hardware as in a switch on a chip
>that many SOHO routers have? Or is it some sort of higher end ASIC that
>gets into the data path? Or is it software a la bridging on Linux?

All three apply. _You_ know that.

Greetings
Marc
--
-------------------------------------- !! No courtesy copies, please !! -----
Marc Haber | " Questions are the | Mailadresse im Header
Mannheim, Germany | Beginning of Wisdom " |
Nordisch by Nature | Lt. Worf, TNG "Rightful Heir" | Fon: *49 621 72739834