[j-nsp] Why should I *not* buy an MX?

[Keegan.Holley at sungard.com]

Technically all routers are switches (or groups of switches in the case of 
GSR's and M series, etc).  Unless you are doing process switching (not 
recommended) all the routing function really does is generate and cache a 
series of forwarding destinations for the switching ASIC's.  Once this is 
done all the packets are switched the same way they are in layer 2 
devices.  There are some functions that come along with L3 intelligence 
such as ACL's,/FW filters and QOS but even here the actual work is done by 
the switching ASIC's, but this is all semantics anyway. 




From:
sthaug at nethelp.no
To:
davidtball at gmail.com
Cc:
billf at mu.org, juniper-nsp at puck.nether.net
Date:
11/07/2008 05:29 PM
Subject:
Re: [j-nsp] Why should I *not* buy an MX?
Sent by:
juniper-nsp-bounces at puck.nether.net



>     I'm not sure I follow.......do you not consider Foundry's MLX and
> XMR lines to be 'routers' ?  I admit, they've essentially taken a
> switch and taught it to route.....similar to the way Juniper took a
> router and are teaching it to switch (MX doing STP, etc).

We haven't seriously looked at Foundry MLX and XMR, so I can't comment
on those. We *do* know quite a bit about Cisco 6500/7600 and how well
turning a switch into a router has worked for them. Knowing this we
are very glad that the Juniper MX series "inheritance" is from the
router side...

Steinar Haug, Nethelp consulting, sthaug at nethelp.no
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