Bug 738610 – The network-bridge script does not set the MTU of the bridge to match the MTU of the physical interface

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Bug 738610 - The network-bridge script does not set the MTU of the bridge to match the MTU of the physical interface

Summary:	The network-bridge script does not set the MTU of the bridge to match the MTU...

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 5
Classification:	Red Hat
Component:	xen (Show other bugs)
Sub Component:
Version:	5.6
Hardware:	x86_64 Linux

Priority	medium Severity high
Target Milestone:	rc
Target Release:	---
Assigned To:	Xen Maintainance List
QA Contact:	Virtualization Bugs
Docs Contact:

URL:
Whiteboard:
Keywords:	ZStream

Depends On:	733417
Blocks:
	Show dependency tree / graph

Reported:	2011-09-15 07:31 EDT by RHEL Product and Program Management
Modified:	2013-01-10 23:03 EST (History)
CC List:	11 users (show)

See Also:
Fixed In Version:	xen-3.0.3-132.el5_7.1
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2011-10-24 13:14:20 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2011:1401	normal	SHIPPED_LIVE	Moderate: xen security and bug fix update	2011-10-24 13:13:51 EDT

Groups: None (edit)

Description RHEL Product and Program Management 2011-09-15 07:31:02 EDT

This bug has been copied from bug #733417 and has been proposed
to be backported to 5.7 z-stream (EUS).

Comment 4 Miroslav Rezanina 2011-09-19 04:28:48 EDT

Fix built into xen-3.0.3-132.el5_7.1

Comment 6 Qixiang Wan 2011-09-20 10:12:18 EDT

Verified with xen-3.0.3-132.el5_7.1.

Test env setup:

2 hosts of RHEL5.7.z x86_64:
kernel: kernel-xen-2.6.18-274.5.1.el5
Network card: Intel Corporation 82566DM-2 Gigabit Network, driver: e1000e
xen: xen-3.0.3-132.el5_7.1

Guest RHEL5.7.z x86_64 PV guest:
kernel: kernel-xen-2.6.18-274.5.1.el5

[1] Connect the 2 hosts with a crossover cable

[2] Configure the 2 hosts to use static ip and set MTU=9000, like this
# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
HWADDR=00:23:AE:6F:F6:3D
BOOTPROTO=static
IPADDR=192.168.0.1
NETMASK=255.255.255.0
MTU=9000
ONBOOT=yes

eth0 is the interface connect to the crossover cable, and xen bridge connects to eth0:
# cat /etc/xen/xend-config.sxp
(network-script 'network-bridge netdev=eth0 bridge=xenbr0')

similar configuration on the other host.

[3] install the PV guest, update kernel to zstream kernel and configure the virtual nic to use static ip (in the same subnet of host) and MTU=9000, guest is using xenbr0.

[4] boot up the PV guest with the configuration in step [3].

[5] migrate the guest between the 2 hosts.

Test result:

1. After step [2], the interfaces eth0, peth0 and xenbr0 shows up with MTU=9000 in ifconfig output.
2. After step [4], the interface of backend vif has MTU=9000  in Dom0 (e.g. vif2.0)ifconfig output.
   The ifconfig output within DomU aslo has MTU=9000 for frontend interface (e.g. eth0) too.
3. After step [5], the interface of backend vif on the destination host has MTU=9000 in Dom0 (e.g. vif2.0)ifconfig output.
   The ifconfig output within DomU aslo has MTU=9000 for frontend interface (e.g. eth0) too.

Comment 7 errata-xmlrpc 2011-10-24 13:14:20 EDT

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2011-1401.html

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