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About "Netflow LAN Switching" and "Netflow Switching".

In the last "CCNP Official Certification Guide" by Hucaby you can find:

"Multilayer switching began as a dual effort between a RP and a SE.
The basic idea is to "route once and switch many".
The RP receives the first packet of a new traffic flow between two hosts, as usual.
A routing decision is made, and the packet is forwarded toward the destination.
To participate in multilayer switching, the SE must know the identity of each RP.
The SE then can listen in to the first packet going to the router and also going away from the router.
If the SE can switch the packet in both directions, it can learn a "shortcut path" so that subsequent
packets of the same flow can be switched directly to the destination port without passing through the RP.
This technique also is known as NetFlow switching or route cache switching.".

In the "Cisco LAN Switching" by Clark and Hamilton you can find:

"It is also important to realize that MLS, formerly known as NetFlow LAN Switching,
is a completely different mechanism than the NetFlow switching on Cisco's software based routers.".

Netflow switching on Cisco's based routers is expalined, with the other switching modes, in the
"CCIE Practical Studies Volume II" by Solie and Lynch.

I would like that someone confirmed me that the term Netflow switching in the CCNP Guide is the same
of the term Netflow LAN Switching in the "bible" and that other thing is the term Netflow switching when
referred to software based routers.

Thanks.

1 REPLY
Hall of Fame Super Silver

Re: About "Netflow LAN Switching" and "Netflow Switching".

Hello Matteo,

on SW based routers netflow is used for IP flow based accouting on  first generation multilayer switches the netflow swiching was a traffic driven route cache technology that can be found on SUP1/MSFC1 or some C4500 old chassis.

one could use a term like netflow lan switching to better define multilayer switching.

Unfortunately, as you have noted, some other books use the same term netflow switching with a different meaning that depends on the context.

Current multilayer switches are based on CEF so in real world there are less chances of confusion nowdays

Hope to help

Giuseppe

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