Created attachment 319552 [details]
set MTU on interface before adding to bridge.

Description of problem:

When bringing up interface (with ifup or service network start) which has MTU>1500 set in ifcfg-ethX file, but is also a part of some bridge device (BRIDGE=br0), MTU on ethX is not set to specified value. As a result, MTU of whole bridge device remains 1500.


Version-Release number of selected component (if applicable):

initscripts-8.45.19.1.EL-1.el5

How reproducible:

Easy.


Steps to Reproduce:
1. Configure ethX interface (file /etc/sysconfig/network-scripts/ifcfg-ethX) with
MTU=8000
BRIDGE=br0

ethX has to be GigE interface in order to increase MTU.

2. Configure br0 interface (file /etc/sysconfig/network-scripts/ifcfg-br0) 

3. bring up ethX and br0

  
Actual results:

MTU on ethX and br0 is 1500


Expected results:

MTU on ethX and br0 should be 8000


Additional info:

Attached patch solves this problem - MTU is explicitly set to specified value before adding ethX to bridge.