[c-nsp] packet loss when servers are brought online

Phil Mayers p.mayers at imperial.ac.uk
Tue Nov 30 12:02:57 EST 2010


On 30/11/10 16:45, Christopher Hobbs wrote:
> I'm not sure that this list is the best place to post, but given that the
> issue involves a stack of 3750s, I figured I'd cover all my bases.  See the
> following posts for reference:

You mention you're using iSCSI.

What utilisation rates are you hitting? The 3750 has pretty small 
per-port buffers, so if you are contending one or more ports, you could 
be getting packet loss due to that.

e.g. you boot a machine, it hits a disk very hard over iSCSI, causing 
contention and packet loss.

Can you supply a diagram? Showing ports & vlan memberships?

Also, can you be more specific than "packet loss". Packet loss on which 
path, between which two hosts?


More information about the cisco-nsp mailing list