Re: [Xen-users] Xen 4.1.0, multiple network interfaces, network-bridge failing to create multiple bridges

[Jan Vejvalka <jan.vejvalka@xxxxxxxxxxxxxxx>]

On 5.5.2011 19:19, Joseph Glanville wrote:
> Hi,
>
> > From your original post I can gather you wish to create 2 bridges, one
> each for the interfaces eth0 and eth1?
>
> This can be achieved by running the following:
> brctl addbr xenbr0
> brctl addif xenbr0 eth0
> brctl addbr xenbr1
> brctl addif xenbr1 eth1
>
> Slackware doesn't have a nice way of doing this with it's internal
> networking system but adding the above to rc.local accomplishes the
> job good enough.
Thanks - that's simple enough (and that's what I like on Slack, that it
does not create complicated ways to hide simple things).

> To make use of a multiple bridge setup effectively you need to specify
> the bridge in the vif statement of the xen config file (something like
> bridge=xenbr0)
>
> Note, only network-bridge and associated are depreciated.
> You still require the vif-bridge script to be enabled in
> /etc/xen/xend-config.xcp
>
> When domains are created Xen will create the vif adapters to the
> following naming convention:
> vif<domid>.<adapternumber>
>
> So for a domid of 5 and a system with 2 adapters the following vif
> devices will be created in dom0:
> vif5.0
> vif5.1
>
> During device hotplug the vif-script then brings this interface up and
> adds it to the bridge.
>
> Do you have any further questions or need any further clarification on
> any of the points above?
- There are "7 pairs of connected virtual ethernet interfaces for Dom0"
  mentioned in http://wiki.xensource.com/xenwiki/XenNetworking . Is
  that still valid ?

- Not sure how VLANs are handled by the bridges; two setups come to my
  mind: either connecting the specific VLAN (e.g. eth0.5) to xenbrX in
  Dom0 or connecting all eth0 and selecting the right VLAN(s) on the
  ethernet interface in DomU. Both ways can have their pros and cons,
  are both possible ?

Otherwise it's clear enough at the moment, thanks :-)

> I am considering writing an article on Xen Wiki about how network
> configuration is carried out in Xen as it seems to be an area alot of
> people have problems with.
That would definitely be most useful.

Thanks,

Jan

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