Port Load sharing

[Paul11]

After i enable Lacp .. port is not sharing. Utilization is high on Link 1 only.
I want to use load balance on both links.
Please kindly see the below output and advice thanks.

* I try L2 static, L3_L4 and LACP. all the same ports are not load balance. *

enable sharing 1 grouping 1,4

enable sharing 1 grouping 1,4 L3_L4

enable sharing 1 grouping 1,4 algorithm address-based L3_L4 lacp


CoreSW # sh port 1,4 utilization bandwithPort Link Link Rx Peak Rx Tx Peak Tx
State Speed % bandwidth % bandwidth % bandwidth % bandwidth
================================================================================
Link_1> A 1000 82.06 94.94 48.23 55.72
Link_2> A 1000 0.25 0.30 1.34 1.57
================================================================================
> indicates Port Display Name truncated past 8 characters
Link State: A-Active, R-Ready, NP-Port Not Present, L-Loopback

CoreSW #sh sharing
Load Sharing Monitor
Config Current Agg Ld Share Ld Share Agg Link Link Up
Master Master Control Algorithm Group Mbr State Transitions
==============================================================================
1 1 LACP L3_L4 1 Y A 0
L3_L4 4 Y A 0
==============================================================================
Link State: A-Active, D-Disabled, R-Ready, NP-Port not present, L-Loopback
Load Sharing Algorithm: (L2) Layer 2 address based
(L3_L4) Layer 3 address and Layer 4 port based
Number of load sharing trunks: 1


Core2 # sh lacp lag 1
Lag Actor Actor Partner Partner Partner Agg Actor
Sys-Pri Key MAC Sys-Pri Key Count MAC
--------------------------------------------------------------------------------
1 0 0x03e9 00:04:96:34:b2:e1 0 0x03e9 2 00:04:96:34:b2:e0

Port list:

Member Port Rx Sel Mux Actor Partner
Port Priority State Logic State Flags Port
--------------------------------------------------------------------------------
1 0 Current Selected Collect-Dist A-GSCD-- 1001
4 0 Current Selected Collect-Dist A-GSCD-- 1012
================================================================================
Actor Flags: A-Activity, T-Timeout, G-Aggregation, S-Synchronization
C-Collecting, D-Distributing, F-Defaulted, E-Expired

[Jarek]

Hi,

congestion counter increase when switch buffer on egress have insufficient space for packets.

Mostly traffic flows from router to access switch and because of that you see congestion only on X450a.
For example you have about 500 Mb egress traffic per 1G port.
Internet traffic is not constant, some time we see micoroburst - we try send more than 1G or near 1G

What you see after: 'show port buffer' ?

What you can do:
- enable flow control
- if you use qosprofiles - delete unused qosprofiles
- tune port buffer - don't change if you don't know what are you doing 🙂

--
Jarek

[Sunil_Pratap_Si]

Router---------Extreme switch(X450a-48t)--------(Port aggregation)-------Extreme Switch (Summit48si),

On X450a-48t (enable sharing 2:2 grouping 2:2-4 algorithm address-based L3_L4) and on Summit48si (enable sharing 1 grouping 1,2,3 algorithm address-based )

We are facing congestion on all aggregated ports (X450a-48t) while not able to see on Summit48si. There is sufficient bandwidth. What could be the problem

[Prashanth_KG]

In addition to comments from Stephane, the packets at the port level can be monitored using the command, "show port congestion".

[Stephane_Grosj1]

Traffic would be dropped. Changing the hashing algo to l3_l4 is a good try. If most of your traffic is between 2 end-systems, you need to find some entropy in the headers to help load-balancing. L4 usually helps there.