RE: SNMP reporting wrong max bandwidth

Dave, 

I really appreciate your help here.

>> mibII/interfaces: ETHTOOL_GSET on eth0 speed = 1000

>That shows that eth0 is being (correctly) detected as 1000 Mb/sec

>> mibII/interfaces: fallback to mii for eth1

>That shows that the agent doesn't believe the speed it is
>getting back for eth1, and tries another approach ....

>> mibII/interfaces: SIOCGMIIPHY on eth1 failed

>.... which fails, before falling back to a hardcoded default
>of 10 Mb/sec.

>So there are now two separate issues:
>  -  Why is the initial speed for eth1 being discarded?
>  -  Why does the speed for eth0 change from 1000 to 100 Mb/sec ?
>       (assuming that ifName.1 is "eth1" and ifName.2 is "eth0")

>Which do you want to investigate first?

I actually don't think the speeds are being misreported in this case.  The
snmpd -DmibII/interfaces was run on my monitoring server, isis.  According
to MRTG (grain of salt I know) it is correctly being reported as 1000Mb/s
for eth0, which seems to be bared out by this line in the debug output:

ETHTOOL_GSET on eth0 speed = 1000

eth1 is not configured on this server, so could that be the reason for the
fallback to mii and subsequent failure of SIOCGMIIPHY?

When I try to run the same command on one of the servers that is being
misreported I get:

snmpd -DmibII/interfaces
No log handling enabled - turning on stderr logging
registered debug token mibII/interfaces, 1
mibII/interfaces: No link...
grdb:/home/tdonnelly # mibII/interfaces: No link...
[init_smux] bind failed: Address already in use
Error opening specified endpoint ""
Server Exiting with code 1

I can confirm that snmp is running, although it is a different version that
what is on isis (5.4.rc2 vs. 5.3.0.1).

But to answer you assumption:

IF-MIB::ifName.1 = STRING: lo
IF-MIB::ifName.2 = STRING: eth0
IF-MIB::ifName.3 = STRING: eth1
IF-MIB::ifName.4 = STRING: sit0




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