Wired

Hello,

I need to create a symetrical bundle using LACP. I need to balance traffic in 2x10G links but I must be sure that a packets for a flow identified by SRC_IP=A and DST_IP=B go upstream and downstream for same link. For example, the LACP hash algoritm will use SRC_IP=A and DST_IP=B to chose a link to go upstream. Other switch should chose the same link for downstream. In this case, SRC_IP=B and DST_IP=A. is it possible?.

Thanks in advanced.

Regards.

------------------------------
Antonio Guirado
------------------------------

Hi Antonio, I believe LACP were not engineered to guarantee that INCOMING received packets (of the same message/session) will use the same EGRESS port of the sending switch that was used by sent messages of that very same originating message/session...you're asking a sort of "sticking mechanism" for the BOTH the outgoing (which can be reasonable) AND INCOMING data flows (generally such of a sticking mechanism - at least when implemented in Firewalls, as example - is used to guarantee that packets of the same message will use the same OUTGOING interface to reach their common destination...typical when you have a Firewall with Dual WAN and you need that a particular session hits a particular WAN link without flip-flop between WANs).

Static or LACP aggregations (Port Trunks/LAGs) work with the switch distributing its OUTGOING packets on its aggregated ports...thus the switch implementing Static/LACP aggregated interface has no control on the data traffic it RECEIVES back from the upstream switch it is connected to (that peer switch indeed controls its OUTGOING traffic autonomously, traffic you want to receive back on the very same Static/LACP LAG/Port Trunk).

Post your doubts/requests/issues on the Airheads Wired Intelligent Edge sub-forum otherwise you're at risk your post to pass unnoticed here in this part of the forum.

------------------------------
Davide Poletto
------------------------------

Original Message:
Sent: Feb 09, 2021 12:05 PM
From: Antonio Guirado
Subject: 6300 LACP symetric traffic

Hello,

I need to create a symetrical bundle using LACP. I need to balance traffic in 2x10G links but I must be sure that a packets for a flow identified by SRC_IP=A and DST_IP=B go upstream and downstream for same link. For example, the LACP hash algoritm will use SRC_IP=A and DST_IP=B to chose a link to go upstream. Other switch should chose the same link for downstream. In this case, SRC_IP=B and DST_IP=A. is it possible?.

Thanks in advanced.

Regards.

------------------------------
Antonio Guirado
------------------------------

Hi,

yes, it is true. I have studied Cisco, Juniper, Huawai and there is a feature named Symmetric hashing to be sure that forward and reverse traffic use the same link in a LACP bundle. Do you know if Aruba has this feature?.

Thanks.

------------------------------
Antonio Guirado
------------------------------

Original Message:
Sent: Feb 14, 2021 05:34 AM
From: Davide Poletto
Subject: 6300 LACP symetric traffic

Hi Antonio, I believe LACP were not engineered to guarantee that INCOMING received packets (of the same message/session) will use the same EGRESS port of the sending switch that was used by sent messages of that very same originating message/session...you're asking a sort of "sticking mechanism" for the BOTH the outgoing (which can be reasonable) AND INCOMING data flows (generally such of a sticking mechanism - at least when implemented in Firewalls, as example - is used to guarantee that packets of the same message will use the same OUTGOING interface to reach their common destination...typical when you have a Firewall with Dual WAN and you need that a particular session hits a particular WAN link without flip-flop between WANs).

Static or LACP aggregations (Port Trunks/LAGs) work with the switch distributing its OUTGOING packets on its aggregated ports...thus the switch implementing Static/LACP aggregated interface has no control on the data traffic it RECEIVES back from the upstream switch it is connected to (that peer switch indeed controls its OUTGOING traffic autonomously, traffic you want to receive back on the very same Static/LACP LAG/Port Trunk).

Post your doubts/requests/issues on the Airheads Wired Intelligent Edge sub-forum otherwise you're at risk your post to pass unnoticed here in this part of the forum.

------------------------------
Davide Poletto

Original Message:
Sent: Feb 09, 2021 12:05 PM
From: Antonio Guirado
Subject: 6300 LACP symetric traffic

Hello,

I need to create a symetrical bundle using LACP. I need to balance traffic in 2x10G links but I must be sure that a packets for a flow identified by SRC_IP=A and DST_IP=B go upstream and downstream for same link. For example, the LACP hash algoritm will use SRC_IP=A and DST_IP=B to chose a link to go upstream. Other switch should chose the same link for downstream. In this case, SRC_IP=B and DST_IP=A. is it possible?.

Thanks in advanced.

Regards.

------------------------------
Antonio Guirado
------------------------------

Original Message:
Sent: 2/14/2021 12:10:00 PM
From: antonio.guirado@f-integra.org
Subject: RE: 6300 LACP symetric traffic

Hi,

yes, it is true. I have studied Cisco, Juniper, Huawai and there is a feature named Symmetric hashing to be sure that forward and reverse traffic use the same link in a LACP bundle. Do you know if Aruba has this feature?.

Thanks.

------------------------------
Antonio Guirado
------------------------------

Original Message:
Sent: Feb 14, 2021 05:34 AM
From: Davide Poletto
Subject: 6300 LACP symetric traffic

Hi Antonio, I believe LACP were not engineered to guarantee that INCOMING received packets (of the same message/session) will use the same EGRESS port of the sending switch that was used by sent messages of that very same originating message/session...you're asking a sort of "sticking mechanism" for the BOTH the outgoing (which can be reasonable) AND INCOMING data flows (generally such of a sticking mechanism - at least when implemented in Firewalls, as example - is used to guarantee that packets of the same message will use the same OUTGOING interface to reach their common destination...typical when you have a Firewall with Dual WAN and you need that a particular session hits a particular WAN link without flip-flop between WANs).

Static or LACP aggregations (Port Trunks/LAGs) work with the switch distributing its OUTGOING packets on its aggregated ports...thus the switch implementing Static/LACP aggregated interface has no control on the data traffic it RECEIVES back from the upstream switch it is connected to (that peer switch indeed controls its OUTGOING traffic autonomously, traffic you want to receive back on the very same Static/LACP LAG/Port Trunk).

Post your doubts/requests/issues on the Airheads Wired Intelligent Edge sub-forum otherwise you're at risk your post to pass unnoticed here in this part of the forum.

------------------------------
Davide Poletto

Original Message:
Sent: Feb 09, 2021 12:05 PM
From: Antonio Guirado
Subject: 6300 LACP symetric traffic

Hello,

I need to create a symetrical bundle using LACP. I need to balance traffic in 2x10G links but I must be sure that a packets for a flow identified by SRC_IP=A and DST_IP=B go upstream and downstream for same link. For example, the LACP hash algoritm will use SRC_IP=A and DST_IP=B to chose a link to go upstream. Other switch should chose the same link for downstream. In this case, SRC_IP=B and DST_IP=A. is it possible?.

Thanks in advanced.

Regards.

------------------------------
Antonio Guirado
------------------------------