On Fri, May 30, 2014 at 3:59 PM, Boris Epstein <borepstein at gmail.com> wrote: > Hello all, > > I have a CentOS box that has a NIC (eth0) on which I defined 4 VLAN's > (counting the NIC itself): eth0, eth0.1, eth0.2 and eht0.3. Initially the > Cisco switch was not partitioned into VLAN's which means that the only VLAN > running on it was the default one (VLAN 1). > I take eth0 is then an untagged vlan? > I have then played with VLAN's a bit on the switch and at this point have > two: VLAN 1 (which is default and can not be deleted) and VLAN 3. The Actually you can make the default vlan be someone else. And, risking going on a tangent, it is a good idea not leaving vlan1 as the default one in a cisco device. Also, just to be sure, this vlan is tagged in this trunk port in the cisco side, right? > CentOS box is plugged into a trunk port on VLAN 3 which by virtue of being > a trunk should belong to all VLANs. However, this does not seem to work as > expected. > > What I get is the following: > > 1) eht0 does not come up at all. > > ifup eth0 > Device eth0 does not seem to be present, delaying initialization > How are you bringing them up: network manager or not? Do dmesg and the logs show anything interesting? > 2) eth0.3 comes up fine. > > 3) Other VLAN's do not come up. No error messages, just never show up. > Do the interfaces show up? > Any insight into this would be most welcome. Primarily, I fail to > understand why all those VLAN's came up on VLAN 1 and why now even VLAN 1 > does not come up - even though the trunk port the device is plugged into is > supposed to be a member of all VLAN's. This is how the vlans I defined one of my centos boxes to know (more like act like they care) of: cat /proc/net/vlan/config VLAN Dev name | VLAN ID Name-Type: VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD eth0.10 | 10 | eth0 eth0.2 | 2 | eth0 eth0.3 | 3 | eth0 eth0.4 | 4 | eth0 eth0.8 | 8 | eth0 Not trying to second guess you, but here is what a trunk I defined in a cisco switch looks like: ! interface FastEthernet0/2 description 802.1Q Trunk to vmhost switchport trunk encapsulation dot1q switchport trunk native vlan 2 switchport trunk allowed vlan 1-15,1002-1005 switchport mode trunk ! > > Thanks in advance. > > Boris. > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos