[e-nsp] multicast packets reordering

[Fabian]

Hi Marcin,

It should not (and if using LAG/Multilink with 'i' Extreme switches, all
Mcast traffic goes through the same port).

Are you using them with IP Mcast routing (PIM, DVMRP) or simple Layer 2
VLAN?
I would suggest to test without the Redback or connecting your TestSystem
level by level.

Regards, Fabian.

-----Original Message-----
From: extreme-nsp-bounces at puck.nether.net
[mailto:extreme-nsp-bounces at puck.nether.net] On Behalf Of Marcin Kuczera
Sent: vendredi 19 septembre 2008 14:02
To: extreme-nsp at puck.nether.net
Subject: [e-nsp] multicast packets reordering

hello,

I'am testing IP TV using extreme core based on quite old, but
still alive Alpine3808,3804 and Summit5i switches.

At the moment, the test device generating multicast reports
is connected in this way:

source-->AlpineA-->RedBack(PIM)-->AlpineA-->AlpineB-->Summit48-->TestSystem.

TestSystem reports:
Sep 18 17:41:00 10.200.180.4 iperf: [ 3] 11310.0-11320.0 sec 2 datagrams
received out-of-order
Sep 18 17:41:30 10.200.180.4 iperf: [ 3] 11340.0-11350.0 sec 1 datagrams
received out-of-order
Sep 18 17:42:10 10.200.180.4 iperf: [ 3] 11380.0-11390.0 sec 2 datagrams
received out-of-order
Sep 18 17:42:40 10.200.180.4 iperf: [ 3] 11410.0-11420.0 sec 1 datagrams
received out-of-order
Sep 18 17:43:00 10.200.180.4 iperf: [ 3] 11430.0-11440.0 sec 1 datagrams
received out-of-order
Sep 18 17:44:20 10.200.180.4 iperf: [ 3] 11510.0-11520.0 sec 1 datagrams
received out-of-order
Sep 18 17:45:40 10.200.180.4 iperf: [ 3] 11590.0-11600.0 sec 2 datagrams
received out-of-order
Sep 18 17:45:50 10.200.180.4 iperf: [ 3] 11600.0-11610.0 sec 1 datagrams
received out-of-order
Sep 18 17:46:00 10.200.180.4 iperf: [ 3] 11610.0-11620.0 sec 3 datagrams
received out-of-order
Sep 18 17:46:10 10.200.180.4 iperf: [ 3] 11620.0-11630.0 sec 1 datagrams
received out-of-order
Sep 18 17:46:30 10.200.180.4 iperf: [ 3] 11640.0-11650.0 sec 1 datagrams
received out-of-order

looks nasty...

soft in Alpine 7.6.4.4
soft in RedBack 6.1.1.4

No multilinks...

Is there any possibility that Alpine does the reordering of packets ??
If yes, is there any solution to that problem ?

Reordering is common problem from the source side, but... I have 10x 
more reorders that others..

Regards,
Marcin
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