IF-MIB::ifSpeed shows wrong value for bonded interface

Discussion:

Dheeraj Gautam

14 years ago

Hi,

On our system we added bonded interface with link-agg-layer3+4 mode and bonded two 1G Ethernet interfaces to the bond. But IF-MIB::ifSpeed is showing as 10Mbps only.

IF-MIB::ifSpeed.10 = Gauge32: 10000000

We expected this to be shown as 2Gbps.

* Did anybody else also faced this issue ?
* Any possible reason of this issue ?

We are using Net-SNMP version 5.3.1 and linux Centos EL5 with kernel 2.6.18-164.15.1.el5

-Dheeraj

Dave Shield

14 years ago

Permalink

Post by Dheeraj Gautam
On our system we added bonded interface with link-agg-layer3+4 mode and bonded
two 1G Ethernet interfaces to the bond. But IF-MIB::ifSpeed is showing as 10Mbps only.
We are using Net-SNMP version 5.3.1

That's a very old version of the agent.
Could you possibly try with something a little more recent,
and see if the problem still appears.

Dave

Garrett Cooper

14 years ago

Permalink

Post by Dheeraj Gautam
Hi,
On our system we added bonded interface with link-agg-layer3+4 mode and bonded two 1G Ethernet interfaces to the bond. But IF-MIB::ifSpeed is showing as 10Mbps only.
IF-MIB::ifSpeed.10 = Gauge32: 10000000
We expected this to be shown as 2Gbps.
* Did anybody else also faced this issue ?
* Any possible reason of this issue ?
We are using Net-SNMP version 5.3.1 and linux Centos EL5 with kernel 2.6.18-164.15.1.el5

What does ifconfig for your interface say?
Thanks,
-Garrett

Dheeraj Gautam

14 years ago

Permalink

Post by Garrett Cooper
What does ifconfig for your interface say?

Following the output of ifconfig on my system.
0=> bonded interface
eth0 => physical interface
eth1 => slave interface

[***@qa04 ~]# ifconfig 0
0 Link encap:Ethernet HWaddr 00:13:CC:01:91:3B
inet addr:10.9.1.1 Bcast:10.9.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1
RX packets:699 errors:0 dropped:0 overruns:0 frame:0
TX packets:14636 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:4096
RX bytes:85716 (83.7 KiB) TX bytes:1814876 (1.7 MiB)

[***@qa04 ~]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:21:5A:F6:CD:C4
inet addr:10.157.42.157 Bcast:10.157.63.255 Mask:255.255.224.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:644117 errors:0 dropped:0 overruns:0 frame:0
TX packets:5534 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:4096
RX bytes:80500670 (76.7 MiB) TX bytes:839843 (820.1 KiB)
Interrupt:201 Memory:fd1f0000-fd200000

[***@qa04 ~]# ifconfig eth1
eth1 Link encap:Ethernet HWaddr 00:13:CC:01:91:3B
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:4096
RX bytes:0 (0.0 b) TX bytes:640 (640.0 b)
Interrupt:209 Memory:fd2f0000-fd300000

-Dheeraj

Garrett Cooper

14 years ago

Permalink

...

Ah, that's right... linux doesn't mention the media speed in ifconfig like *BSD:

$ ifconfig re0
re0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric
0 mtu 1500
options=3899<RXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_UCAST,WOL_MCAST,WOL_MAGIC>
ether e0:cb:4e:01:49:32
inet6 fe80::e2cb:4eff:fe01:4932%re0 prefixlen 64 scopeid 0x5
inet 192.168.20.2 netmask 0xffffff00 broadcast 192.168.20.255
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active

A quick google search says that you need to use ethtool (
http://www.cyberciti.biz/faq/howto-determine-ethernet-connection-speed/
), but there are other ways to determine the necessary details by
blasting ioctls, etc.

Cheers,
-Garrett

Dheeraj Gautam

14 years ago

Permalink

Post by Garrett Cooper
A quick google search says that you need to use ethtool (
http://www.cyberciti.biz/faq/howto-determine-ethernet-connection-speed/
), but there are other ways to determine the necessary details by
blasting ioctls, etc.

Ethtool didn't provided much data. mii-tool provide some more data. it also says only 10Mbps.

[***@qa04 ~]# ethtool 0
Settings for 0:
Link detected: yes
[***@qa04 ~]# ethtool eth0
Settings for eth0:
Supported ports: [ TP ]
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: g
Current message level: 0x000000ff (255)
Link detected: yes
[***@qa04 ~]#

[***@qa04 ~]# mii-tool -v eth0
eth0: negotiated 100baseTx-FD flow-control, link ok
product info: vendor 00:50:ef, model 45 rev 0
basic mode: autonegotiation enabled
basic status: autonegotiation complete, link ok
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
[***@qa04 ~]# mii-tool -v 0
0: 10 Mbit, half duplex, link ok
product info: vendor 00:01:00, model 0 rev 4
basic mode: 10 Mbit, half duplex
basic status: link ok
capabilities:
advertising:
[***@qa04 ~]#

-Dheeraj

Garrett Cooper

14 years ago

Permalink

Post by Dheeraj Gautam

Ethtool didn't provided much data. mii-tool provide some more data. it also says only 10Mbps.

This suggests it's an OS issue and not necessarily net-snmp. If
net-snmp is using the same ioctls as *BSD, it should be getting the
data directly from the driver, which I know occurs on some versions of
FreeBSD with some drivers (case and point: bce(4) on 7.x).
HTH,
-Garrett