Xen users - Jul 2011 - my eth3 lost connectivity when the xenbridge is setup

hi All,

yesterday, i did yum update to my xen host....
i have 4 ethernet devices: eth0,1,2,3.
eth0 and eth1 are slaves of bond0. Bond0 is trunked and it as 3 different ip
addresses on different subnets: bon0.42, bond0.43 and bond0.44
eth2 is a private network
eth3 is a different subnet, not trunked.

After yum update completed, i reboot the host and all was ok, until xend
started....
doing some researchm i found that the problem was only with eth3 after
enabling xenbr for it....

For that i use a script which is called from /etc/xen/xend-config.sxp (when
xend starts): /etc/xen/scripts/multi-network-bridge:

#!/bin/sh
#
vconfig set_name_type DEV_PLUS_VID_NO_PAD
dir=$(dirname "$0")
#-------------------------------------------------------------------------

/etc/xen/scripts/network-bridge  $@ vifnum=1 bridge=xenbr2 netdev=bond0.42

/etc/xen/scripts/network-bridge  $@ vifnum=2 bridge=xenbr3 netdev=bond0.43

/etc/xen/scripts/network-bridge  $@ vifnum=3 bridge=xenbr4 netdev=bond0.44

##/etc/xen/scripts/network-bridge  $@ vifnum=5 bridge=xenbr1 netdev=eth3

#-------------------------------------------------------------------------
For now, i commented out the last line, which is giving problems. the other
bridges works fine.

Does anybody have idea of what''s going on?

I''m a little bit desperate

Thanx!
-- 
Rogelio Bazan


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Hi Rogelio,

> After yum update completed, i reboot the host and all was ok, until xend
started....
> doing some researchm i found that the problem was only with eth3 after
enabling xenbr for it....
What does "brctl show" say?
> ##/etc/xen/scripts/network-bridge  $@ vifnum=5 bridge=xenbr1 netdev=eth3

Create these two files in /etc/sysconfig/network-scripts:

ifcfg-xenbr1:

TYPE=Bridge
DEVICE=xenbr1
ONBOOT=yes
STP=off
BOOTPROTO=none

(or if you want the bridge to have an IP, which might make sense for testing,
use IPADDR and NETMASK together with BOOTPROTO=static)


ifcfg-eth3:

DEVICE=eth3
BRIDGE=xenbr1
HWADDR=<your_MAC_address>
BOOTPROTO=none
ONBOOT=yes


Then:
ifup xenbr1
ifup eth3

...and then you wait a few second until the bridge leaves learning state and
enters forwarding state, and you should be all set.

I''d recommend to comment out all occurrences of 
# (network-script network-bridge)
in /etc/xen/xend-config.sxp, and then let the OS deal with the interface and
bridge setup as shown above. I believe the wiki suggests the same for Xen 4.1
(if not earlier versions), which doesn''t actually need xend any more
anyway.



Cheers
Carsten





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