Here are some interesting links
http://newsroom.cisco.com/dlls/corp_022201.html
http://www.cisco.com/warp/customer/cc/pd/rt/12000/12416/prodlit/itro_ds.htm
http://www.cisco.com/warp/customer/cc/pd/ifaa/oc192/prodlit/cc19_ds.htm
The thing is, Juniper's technology is based upon a central bus architecture
where as the new GSR routers have a processor for each interface card (as
the Juniper has one central CPU).
I've seen many tests as where the Juniper routers experience a lot of packet
loss and a decrease in performance and reliability when the node is fully
configured with a complete set of cards. Each time a card is removed or
added, there is downtime with traffic interruptions with the Juniper router
trying to "catch up" with the changes. If you talk with the Engineers at
Juniper, they will tell you that scalability is their biggest problem with
their M series routers. You can run with a few, but they won't scale and
you're not able to run a huge network with them without running into major
problems.
The GSRs run the same as if they had only one interface card or if they are
completely filled with interface cards. Each interface card is managed by
its own processor so it all runs independent of each other.
Another downfall of the Juniper routers is that an interface card for an
M160 Juniper router will not work on another Juniper router. For Cisco
equipment (like most other Cisco products as well...), a card that works
with one 12416 GSR Router will work on another 12xxx one without any
problems. Cisco has already tried to keep the interoperability of equipment
and hardwarre, so that is always nice. You can also upgrade the lower end
GSRs to the new 12416 hardware also. Juniper's stuff is all individual
hardware specific.
It's very much true that Juniper owns 30% of the Enterprise market share and
that they were the first to come out with the fastest routers, but since
Cisco has released their new GSR routers...they aren't the only ones
anymore. And plus it's also true that Cisco was late coming into this
space, but I think with Cisco's standard of having high quality and control
procedures, was definitely worth the wait. I know tons of loyal Cisco
powered ISPs were waiting for this breakthrough as well.
But I have to admit, Juniper does make some good stuff too (Lots of ex-Cisco
employees migrated over to Juniper to work there). But I'm partial to Cisco
and their equipment but I just wanted to help point out that Juniper is no
longer the only one that makes the fastest routers. =)
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