Re: Jumbo Frames?

[mike <mike503@gmail.com>]

Here's all the information I think could possibly be relevant... does
anything look out of place here?

This is machine A:

[root@lvs01 ~]# ethtool eth0
Settings for eth0:
       Supported ports: [ MII ]
       Supported link modes:   10baseT/Half 10baseT/Full
                               100baseT/Half 100baseT/Full
                               1000baseT/Half 1000baseT/Full
       Supports auto-negotiation: Yes
       Advertised link modes:  10baseT/Half 10baseT/Full
                               100baseT/Half 100baseT/Full
                               1000baseT/Half 1000baseT/Full
       Advertised auto-negotiation: Yes
       Speed: 1000Mb/s
       Duplex: Full
       Port: Twisted Pair
       PHYAD: 1
       Transceiver: internal
       Auto-negotiation: on
       Supports Wake-on: g
       Wake-on: d
       Current message level: 0x000000ff (255)
       Link detected: yes

[root@lvs01 ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:30:48:56:64:38
         inet addr:192.168.1.102  Bcast:192.168.1.255  Mask:255.255.255.0
         UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
         RX packets:299221 errors:0 dropped:0 overruns:0 frame:0
         TX packets:74500 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:541384360 (516.3 MiB)  TX bytes:22598748 (21.5 MiB)
         Interrupt:16





This is machine B:

lvs02:~# ethtool eth0
Settings for eth0:
       Supported ports: [ MII ]
       Supported link modes:   10baseT/Half 10baseT/Full
                               100baseT/Half 100baseT/Full
                               1000baseT/Half 1000baseT/Full
       Supports auto-negotiation: Yes
       Advertised link modes:  10baseT/Half 10baseT/Full
                               100baseT/Half 100baseT/Full
                               1000baseT/Half 1000baseT/Full
       Advertised auto-negotiation: Yes
       Speed: 1000Mb/s
       Duplex: Full
       Port: Twisted Pair
       PHYAD: 1
       Transceiver: internal
       Auto-negotiation: on
       Supports Wake-on: g
       Wake-on: d
       Current message level: 0x000000ff (255)
       Link detected: yes


lvs02:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:30:48:56:64:42
         inet addr:192.168.1.103  Bcast:192.168.1.255  Mask:255.255.255.0
         UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
         RX packets:2951 errors:0 dropped:0 overruns:0 frame:0
         TX packets:301 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:10087616 (9.6 MiB)  TX bytes:25102 (24.5 KiB)
         Interrupt:16



and the two ports on the switch:


switch01# show int st
                                            Flow Link
      Back   Mdix
Port     Type         Duplex  Speed Neg      ctrl State       Pressure Mode
........ ............ ......  ..... ........ .... ........... ........ .......
g19      1G-Copper    Full    1000  Enabled  Off  Up          Disabled On
g21      1G-Combo-C   Full    1000  Enabled  Off  Up          Disabled Off



Both ports full duplex, speed 1000, flow control off, neg enabled,
state up, back pressure disabled, and MDI/MDIX is different (don't
think that should make a difference?)

and I don't know if this is meaningless or not but mii-tool reports only 100

[root@lvs01 ~]# mii-tool
eth0: negotiated 100baseTx-FD flow-control, link ok

however it oinly supports these types anyway:
media: 100baseT4, 100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD,
      (to advertise both HD and FD) 100baseTx, 10baseT

mii-tool is saying flow-control is on, it appears, and the switch
doesn't - but I don't know if mii-tool can be trusted...

Any other information/logs/whatever you want just let me know. I
appreciate any and all help and want to make it as easy as I can to
get the help :)





On 1/30/06, Anthony DeRobertis <anthony@derobert.net> wrote:
> Check to make sure that B is operating in 1000mbps, full duplex, using
> ethtool, and check to make sure the switch agrees. Duplex mismatches
> will kill any ethernet link.