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Description of problem:
Default mtu on physics and vlan device are 1500,when change physics mtu to 1600,VLAN device's mtu is still 1500.
Certainly,you can change vlan device's mtu to 1600 manually,
but I think when you change physics device's mtu ,VLAN's mtu should be changed automatically instead of by manually.
Version-Release number of selected component (if applicable):
kernel 2.6.32-202.el6
How reproducible:
100%
Steps to Reproduce:
1.vconfig add eth4 3
2.ifconfig eth4.3
3.ifconfig eth4 mtu 1600
4.check mtu on eth4.3
Actual results:
Expected results:
Additional info:
case NETDEV_CHANGEMTU:
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = vlan_group_get_device(grp, i);
if (!vlandev)
continue;
if (vlandev->mtu <= dev->mtu)
continue;
dev_set_mtu(vlandev, dev->mtu);
}
Comment 2RHEL Program Management
2011-10-07 15:51:40 UTC
Since RHEL 6.2 External Beta has begun, and this bug remains
unresolved, it has been rejected as it is not proposed as
exception or blocker.
Red Hat invites you to ask your support representative to
propose this request, if appropriate and relevant, in the
next release of Red Hat Enterprise Linux.
Hi, Liang Zheng,
I've posted a patch to upstream,
http://marc.info/?l=linux-netdev&m=131806865926989&w=2
But it is rejected, and the maintainers do not think this is a bug.
Since we can change vlan device's mtu manually,
so the current behaviour is fine as it is.
So feel free to close this bug if you agree.
thanks
Weiping Pan
Description of problem: Default mtu on physics and vlan device are 1500,when change physics mtu to 1600,VLAN device's mtu is still 1500. Certainly,you can change vlan device's mtu to 1600 manually, but I think when you change physics device's mtu ,VLAN's mtu should be changed automatically instead of by manually. Version-Release number of selected component (if applicable): kernel 2.6.32-202.el6 How reproducible: 100% Steps to Reproduce: 1.vconfig add eth4 3 2.ifconfig eth4.3 3.ifconfig eth4 mtu 1600 4.check mtu on eth4.3 Actual results: Expected results: Additional info: case NETDEV_CHANGEMTU: for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { vlandev = vlan_group_get_device(grp, i); if (!vlandev) continue; if (vlandev->mtu <= dev->mtu) continue; dev_set_mtu(vlandev, dev->mtu); }