[j-nsp] Using a QFX5100 without QFabric?

[Matt Freitag]

Karl, we're also looking at QFX5100-48S switches for our aggregation. I
actually have one in place doing aggregation and routing and the only "big"
change I found is the DHCP forwarder config is not remotely similar to the
forwarding-options helpers bootp config we've been using to forward DHCP on
our MX480 core. But that only counts if you do routing and DHCP forwarding
at the QFX.

But, if you want to do routing and DHCP forwarding on this, any forwarding
in the default routing instance goes under forwarding-options dhcp-relay
and any DHCP forwarding in a non-default routing instance goes under
routing-instances INSTANCE-NAME forwarding-options dhcp-relay.

There are a ton of DHCP relay options but we found we just need a server
group that contains all our DHCP servers and an interface group that ties
an interface to a server group.

Again I only bring the DHCP relay stuff up because we've been using
forwarding-options helpers bootp on our MX's to do DHCP forwarding and the
QFX explicitly disallows that in favor of the dhcp-relay.

Other than that initial confusion we've not had a problem and I'm very
interested in any issues you hear of. This QFX I'm talking about runs
Junos 14.1X53-D40.8.

I'm also very interested in any other issues people have had doing this.

Matt Freitag
Network Engineer
Information Technology
Michigan Technological University
(906) 487-3696 <%28906%29%20487-3696>
https://www.mtu.edu/
https://www.mtu.edu/it

On Tue, Oct 24, 2017 at 8:41 AM, Karl Gerhard <karl_gerh at gmx.at> wrote:

> Hello
>
> we're thinking about buying a few QFX5100 as they are incredibly cheap on
> the refurbished market - sometimes even cheaper than a much older EX4550.
>
> Are there any caveats when using the QFX5100-48S as a normal aggregation
> switch without QFabric? We have a pretty basic setup of Access (EX),
> Aggregation (EX or QFX) and Core (MX). We're only switching at our
> aggregation layer but we would like to have options for the future.
>
> Regards
> Karl
>
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