[F10-nsp] S50 and default-network

[Matthias Saou]

Marcus Stoegbauer wrote :

> Matthias Saou wrote:
> > This list seems very calm lately, but it's the first place I've found
> > for Force10 technical discussions, so here I go...
> > 
> > I just bought three S50 switches and stacked them together. So far, so
> > good. I've been having trouble with the Force10 support, because I
> > couldn't download an image from their website for a switch on which I
> > had damaged the image, but that's another story... (and for the record,
> > you can't copy from an installed image to tftp or xmodem to make a
> > backup...)
> > 
> > I've set them up in a stack, which is working fine. I've got two
> > uplinks arriving, both set up with OSPF and receiving routes fine. The
> > issue is that the provider isn't sending any 0.0.0.0 route which the
> > stack would then pick up as its default gateway, as explained in the
> > Force10 Tips and Tricks :
> > https://www.force10networks.com/CSPortal20/KnowledgeBase/HowDoIConfigureLoadBalancing.aspx
> > 
> > With any Cisco Catalyst equipment, the solution here is to use the "ip
> > default-network <network>" configuration, and since the network will be
> > known through both uplinks, it would work and provide failover.
> 
> I haven't used F10 for Layer3 stuff before, but you can always try adding
> a default route and setting the preference low enough so that the OSPF
> default route is the preferred way. In SFTOS (and on S25p, but I don't
> think that should differ much to S50) this can be done with "ip route
> default <gateway-ip> <preference>".

Thanks for the answer. Maybe I wasn't clear enough : I'm not getting
any default gateway (0.0.0.0/0 route) through OSPF, but one of the
networks I am receiving should be considered the "default network".

With Cisco's IOS (3750 switches are what I've used most), this is
trivial with the "ip default-network 192.168.44.0" for instance, which
will make the switch send out packets for unknown destinations towards
that network, which can be learnt through any dynamic routing protocols.

This makes it easy to scale by adding more links through which that
destination is known. The Force10 link from above clearly states that
the SFTOS can handle up to 6 identical cost paths. But without the
ability to point to a default network, it's kind of useless outside of
a LAN.

Matthias

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