Re: [Xen-users] Using zebra

[Dave Hawkes <daveh@xxxxxxxxxxx>]

Gobbledegeek wrote:

> Hello
>        Anyone used Zebra routing daemon and created virtual routers
> before? Is it possible to run OSPF/BGP on each virtual server and get
> them to talk to each other?
> I'm new to Xen and I need to know...  I will be trying this out in the
> coming days and I want to know about any pitfalls to avoid.

Yes, I've done this to provide small "units" that can be individually traffic 
shaped more easily and also heartbeat used
to fail over between live parallel domUs. The bad news is that at least on 
Fedora core 4 the network stalling issue
described at length here is a significant issue. A domU will lose all its 
connectivity on all interfaces for up to 20
minutes and then resurrect itself. During this time packets inside the domU are 
queued and those attempting to get in
are dropped. Also the dynamic IRQ count for the vif is frozen during this 
interval.

There is also a packet drop issue (0.1%) on the vifs and that can be reduced by 
attaching a qdisc and setting up a queue
to smooth the input to the vif.

Heartbeat mitigates this problem somewhat, but on occasions two sessions can 
fall over at once...

Dave






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