Header Only - DO NOT REMOVE - Extreme Networks
Question

Setting an Algorithm for MLAG?


Userlevel 4
Create Date: Jul 17 2013 3:30PM

Hi,

Bit confused about this.

I have two x670v switches running XOS 15.2.3.2 connected together via two 40Gbps Links in a LAG using a static L2 algorithm. 49 to 49 and 53 to 53 using the VIM 4 Card. I want to dual home servers via MLAG providing resilience and High bandwidth.

I've followed the XOS 15.3.2 concepts guide for setting up the ISC VLAN. All looks good, peers are talking to each other (See below). I've added port 1 on each switch to the MLAG but how do you set the algorithm? Or is it defaulted to L2 Static? I know LACP is only supported in 15.3 so am I right in thinking I don't get an option to set the algorithm because there is only L2 Static and that for LACP I need to upgrade to 15.3? See config below.

MLAG Peer : CTC-iSCSI-SW2
VLAN : ISC Virtual Router : VR-Default
Local IP Address : 1.1.1.1 Peer IP Address : 1.1.1.2
MLAG ports : 1 Tx-Interval : 1000 ms
Checkpoint Status : Up Peer Tx-Interval : 1000 ms
Rx-Hellos : 2126 Tx-Hellos : 2177
Rx-Checkpoint Msgs : 34 Tx-Checkpoint Msgs: 51
Rx-Hello Errors : 0 Tx-Hello Errors : 0
Hello Timeouts : 0 Checkpoint Errors : 0
Up Time : 0d:0h:34m:41s Peer Conn.Failures: 0

MLAG Peer : CTC-iSCSI-SW1
VLAN : ISC Virtual Router : VR-Default
Local IP Address : 1.1.1.2 Peer IP Address : 1.1.1.1
MLAG ports : 1 Tx-Interval : 1000 ms
Checkpoint Status : Up Peer Tx-Interval : 1000 ms
Rx-Hellos : 2246 Tx-Hellos : 2246
Rx-Checkpoint Msgs : 54 Tx-Checkpoint Msgs: 37
Rx-Hello Errors : 0 Tx-Hello Errors : 0
Hello Timeouts : 0 Checkpoint Errors : 0
Up Time : 0d:0h:36m:39s Peer Conn.Failures: 0

Local Local Remote
MLAG Local Link Remote Peer Fail Fail
Id Port State Link Peer Status Count Count
================================================================================
1 1 R Down CTC-iSCSI-SW2 Up 1 1
================================================================================

Local Local Remote
MLAG Local Link Remote Peer Fail Fail
Id Port State Link Peer Status Count Count
================================================================================
1 1 R Down CTC-iSCSI-SW1 Up 1 1
================================================================================ (from Ian_Broadway)

2 replies

Userlevel 4
Create Date: Jul 17 2013 3:57PM

Hmm think I've confused myself with this.

If I'm NOT using LACP at the server end (Server Teaming) then the switches don't worry about the algorithm?

So actually I'm ready to plug my server into those two ports and it will work?

However if I want to use LACP for server teaming then I'd need to upgrade my switch code? (from Ian_Broadway)
Userlevel 4
Create Date: Aug 1 2013 10:45AM

There is bug in 15.2 with kernel panic using MLAG so better for You to upgrade switches and don't use LACP with MLAG. I had some issues with LACP and in official doc there is only static LAG. You have to only set algorithm on server side. (from karpiu)

Reply