Date: Tue, 10 Sep 2013 14:23:48 +0200 From: Michael Schuh <michael.schuh@gmail.com> To: FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: igb Intel Gigabit Network Connection I350, lagg, vlan - increase mtu Message-ID: <CADwRVEYHAqCE960%2B_ZK6cex%2BhrFV0KbEokKqfAhH6KCYdAPgWA@mail.gmail.com>
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> Hi, > > My server is running with 4 Gigabit NICs: > > igb0@pci0:5:0:0: class=0x020000 card=0x152115d9 chip=0x15218086 > rev=0x01 hdr=0x00 > vendor = 'Intel Corporation' > device = 'I350 Gigabit Network Connection' > class = network > subclass = ethernet > igb1@pci0:5:0:1: class=0x020000 card=0x152115d9 chip=0x15218086 > rev=0x01 hdr=0x00 > vendor = 'Intel Corporation' > device = 'I350 Gigabit Network Connection' > class = network > subclass = ethernet > igb2@pci0:5:0:2: class=0x020000 card=0x152115d9 chip=0x15218086 > rev=0x01 hdr=0x00 > vendor = 'Intel Corporation' > device = 'I350 Gigabit Network Connection' > class = network > subclass = ethernet > igb3@pci0:5:0:3: class=0x020000 card=0x152115d9 chip=0x15218086 > rev=0x01 hdr=0x00 > vendor = 'Intel Corporation' > device = 'I350 Gigabit Network Connection' > class = network > subclass = ethernet > > > those NICs are connected to switch with LACP aggregation: > > lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 > > options=401bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,VLAN_HWTSO> > ether 00:25:90:c1:1d:18 > inet6 fe80::225:90ff:fec1:1d18%lagg0 prefixlen 64 scopeid 0x8 > nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> > media: Ethernet autoselect > status: active > laggproto lacp lagghash l2,l3,l4 > laggport: igb3 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING> > laggport: igb2 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING> > laggport: igb1 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING> > laggport: igb0 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING> > > > Using this lagg interface I created 2 vlan interfaces: > > vlan14: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu > 1500 > options=103<RXCSUM,TXCSUM,TSO4> > ether 00:25:90:c1:1d:18 > inet 192.168.1.65 netmask 0xffffff00 broadcast 192.168.1.255 > inet6 fe80::225:90ff:fec1:1d18%vlan14 prefixlen 64 scopeid 0x9 > nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> > media: Ethernet autoselect > status: active > vlan: 14 parent interface: lagg0 > > > vlan900: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu > 1500 > options=103<RXCSUM,TXCSUM,TSO4> > ether 00:25:90:c1:1d:18 > inet6 fe80::225:90ff:fec1:1d18%vlan900 prefixlen 64 scopeid 0xa > inet 172.25.25.65 netmask 0xffff0000 broadcast 172.25.255.255 > nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> > media: Ethernet autoselect > status: active > vlan: 900 parent interface: lagg0 > > > I would like to increase the MTU on cards, but I can't set it in any way: > > % sudo ifconfig igbX mtu 9000 [14:59:37] > ifconfig: ioctl (set mtu): Invalid argument > > > event setting the MTU to 1500 (default value) results in same error. > same for lagg0, and vlanX > > > How can I increase the MTU for lagg interface ? > Is it possible without rebooting or only via /etc/rc.conf ? > > Regards, > -- > Marek Salwerowicz > Hi Marek, if i remember well the order of doing so is important. #1 set the mtu on each physical NIC to 9000 #2 create the lagg . . . on a running system it might consist of: destroy the vlans, destroy the lagg, set the mtu on each nic and rebuild the lagg and add the vlans. HTH regards michael
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