Nicholas, like the M160, the M20 does have the option of adding a spare
routing-engine
and/or redundant switch fabric. M5, M10 and M40 do not have that option.
WRT failover, Juniper does support failover not only for the
routing-engine and the switch fabric hardware failures, but for the
routing-engine we support failover down to the
individual process level. For example, you can force a failover if the
'rpd' or
'snmpd' process dies. If you don't need or care for that level of
protection, you can
set it up to fail-over based on a watchdog timer mechanism we put into
the code.
Hope that helps.
Thank,
Bob O'Hara
Systems Engineer
Juniper Networks
Northeast Sales Region
-----Original Message-----
From: nicholas harteau [mailto:nrh@ikami.com]
Sent: Thursday, July 05, 2001 5:23 PM
To: Joe McGuckin
Cc: juniper-nsp@puck.nether.net
Subject: Re: M20 vs. M40
You may really want to consider the M20 versus the M160. I've seen
competitive pricing on a stripped-down M160 versus buying M20s, if you
need to go the uber-upgradable route. I've never seen an M40 up close
(we buy M10s and M20s), but I assumed that it also had provisions for
redundant SSBs and REs. If this is going to be used for any kind of
aggregation rather than just routing big pipes, you should also note
that you can fit more M20s per 7ft rack than M40s, and thus a lot more
PICs and ports.
The move away from LS120 was precipitated, I believe, by the fact that
no one manufactures new LS120 drives anymore, though there are plenty
out there for consumption. I believe media is still being manufactured,
though.
I've had isolated incidents of DOA REs, but never had one fail in
service. Also note that until very recently JunOS didn't have support
for RE failover in software; I'm still not sure what the current state
of that feature is.
Joe McGuckin wrote:
>
> We're looking to purchase a juniper and the final question is which
> one should we get: the difference in price isn't that much and
> the M40 will save us the hassle of having to swap chassis when we
start
> using up the PIC slots.
>
> The M20 does have provision for redundant SSB and Route Engines.
> Is that really necessary? Has anyone ever has an SSB or RE fail?
>
> I notice that Juniper has moved away from the LS120 floppy to flash
> cards
> for media distribution. Has anyone has problems with the LS120 drives?
>
> Comments, advice, etc are welcome!
>
> Thanks,
>
> Joe
>
-- nicholas harteau nrh@ikami.com
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