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Homework and Emergencies Emergency UNIX and Linux Support using multiple iperf instances for performance testing Post 302483847 by elemental on Tuesday 28th of December 2010 04:02:17 PM
Old 12-28-2010
using multiple iperf instances

Hi ppucci,

Multiple iperf instances would work for what you want. I'm assuming that you're using VLAN sub-interfaces (e.g. eth0.1234) since you mentioned 802.1q trunking to your interface.

On the recieve (server) side you can run a single iperf instances that will bind to all interfaces (this is the normal 'iperf -s' behavior), or exec multiple iperf servers, each using -B to bind to a specific interface (for finer-grained logging and control) as pileofrogs mentioned.

To state the obvious: your 20 iperf streams will each be ~50Mbit; This may be fine for switch testing, but mentioning in case your trying to e.g. saturate a multiple port Gigabit switch fabric.
 

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VLAN(7) 						 Miscellaneous Information Manual						   VLAN(7)

NAME
VLAN - virtual local area network DESCRIPTION
This manpage provides a brief overview of VLAN (virtual LAN) technology. VLANs are logical, or network segments that can span multiple physical network segments. A primary benefit of VLANs is that they can iso- late broadcast and multicast traffic by determining which destinations should receive that traffic, thereby making better use of switch and end-station resources. Logical separation using VLAN allows for the logical grouping of PCs, servers and other network resources to behave as if they were con- nected to the same, physical segment, even if they are not. HP-UX VLAN is an implementation of IEEE 802.1p/Q standards. VLAN interfaces can be configured in HP-UX servers using the command (see nwmgr_vlan(1M)) or (see lanadmin_vlan(1M)). HP recommends that you use for HP-UX Release 11i Version 3 and forward. Interfaces can also be configured using the web-based management tool HP-UX System Management Homepage (HP SMH). Each VLAN interface created is assigned a VLAN PPA (VPPA) that is unique across the system and a VLAN ID, that identifies the virtual LAN it is part of. The VLAN ID is unique on the interface on which the VLAN interface is created. WARNINGS
The and commands are deprecated. These commands will be removed in a future HP-UX release. HP recommends the use of replacement command nwmgr(1M) to perform all network interface-related tasks. SEE ALSO
lanadmin(1M), lanadmin_vlan(1M), lanscan(1M), nwmgr(1M), nwmgr_vlan(1M), smh(1M). IEEE 802.1p, IEEE 802.1Q VLAN(7)
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