Bug 733417 – 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 733417 - 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:	Paolo Bonzini
QA Contact:	Virtualization Bugs
Docs Contact:

URL:
Whiteboard:
Keywords:	ZStream

Depends On:	697310
Blocks:	699611 738610
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Reported:	2011-08-25 12:30 EDT by Paolo Bonzini
Modified:	2013-01-10 23:02 EST (History)
CC List:	10 users (show)

See Also:
Fixed In Version:	xen-3.0.3-134.el5
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:	697310
Environment:
Last Closed:	2012-02-21 00:55:44 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2012:0160	normal	SHIPPED_LIVE	xen bug fix and enhancement update	2012-02-20 09:53:33 EST

Groups: None (edit)

Description Paolo Bonzini 2011-08-25 12:30:57 EDT

After configuring two machines (e.g. connected with a crossover cable) to use jumbo frames like this:

# Intel Corporation 82574L Gigabit Network Connection
DEVICE=eth0
HWADDR=00:21:5E:6E:F0:29
ONBOOT=yes
HOTPLUG=no
IPADDR=169.254.100.200
NETMASK=255.255.0.0
NETWORK=169.254.0.0
MTU=9000

and similarly on the other machine, the Xen bridge will not be created with MTU set to 9000.  This is necessary for the bridge to work with large MTU:

ip link set mtu 9000 dev vif0.1
ip link set mtu 9000 dev peth0
ip link set mtu 9000 dev xenbr0

The network-bridge script (and friends) should be changed so that this happens automatically.

Comment 1 Paolo Bonzini 2011-08-26 06:04:51 EDT

The patch depends on the one for bug 697310.

Comment 3 Miroslav Rezanina 2011-09-07 07:44:47 EDT

Fix built into xen-3.0.3-134.el5

Comment 7 Qixiang Wan 2011-11-15 03:59:58 EST

Change to verified per bug 697021 comment 37 and bug 733416 comment 12.

Comment 8 errata-xmlrpc 2012-02-21 00:55:44 EST

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/RHBA-2012-0160.html

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