Unsolved
This post is more than 5 years old
30 Posts
0
51047
July 27th, 2015 07:00
What needs more bandwidth, The MLAG connections of the switch interconnects?
Have a slight quandary and wanted to know what needs the higher bandwidth.
Set up is that we have 2 S4810 using VLT. We have 2 N3000 series switches in an MLAG. The problem is that the N series is a 1Gb switch with 2 10Gb connections. 1 10Gb is connected for the MLAG between the 2 N3000 switches. the other goes to one of the S4810 switches. So S4810-1 is connected to N3000-1 and S4810-2 is connected to N3000-2. I thought that would work but MLAG doesn't like that and wants to be in a mesh configuration. So what do I do? Take a few of the 1Gb ports and add them to the MLAG and take the 10Gb port and put it in each of the s4810 switches (ie S4810-2 goes to n3000-1 and vise versa) I want the best performance possible with the equipment we have. I do not want to stack the N3000 switches.
AMSEAMANS
30 Posts
0
July 27th, 2015 11:00
What traffic actually flows across the peer to peer links? I have it set up but if I disconnect both partner links to one switch the links go down for the host machine on that switch. I thought mlag worked like VLTi.
AMSEAMANS
30 Posts
0
July 27th, 2015 12:00
it is an orphan. There are multiple VLANs but it is isolated on one vlan for testing. The VLAN is set to be tagged on all Port channels and LAGs.
AMSEAMANS
30 Posts
0
July 27th, 2015 12:00
What does not seem to be working is the last bullet point. So really it should work just like VLTi and I should be able to unplug all partner links to switch A and traffic should forward through peer B to Peer A.
AMSEAMANS
30 Posts
0
July 27th, 2015 13:00
So from what I have been reading if you have hosts connected to the peers they have to be connected to each peer and not a single connection to one or the other peer? No orphans on either switch as traffic is not passed through to the mlag. I think with VLTI you can have orphans?
AMSEAMANS
30 Posts
0
July 27th, 2015 14:00
So orphaned devices will work on the partner connections as long as one of them is up, it just won't work across the MLAG if both partner connections on one peer goes down? Correct? I don't see the benefit of mlag then if you have to have the partners in a mesh config anyways. it is unlikely you would lose both connections to two different switches, at least not in our environment.
ciscen
27 Posts
0
October 19th, 2016 00:00
Hi Daniel,
I'm trying to understand mlag use cases in storage network (iscsi/vsan) and active/passive NIC teaming for servers either windows 2012 (native teaming) or vmware (vswitch teaming).
• Support a redundant forwarding plane in the case that all member ports of an MLAG interface are down on an MLAG peer. In this case, traffic received on the peer switch destined to the MLAG peer with the downed ports is sent over the peer-link to the peer MLAG switch for forwarding to the partner switch.
With the information above; does vpc peer link carry/flow the vlans/network traffics like regular lag connection between n series or similar to vlt in force10?
I really appreciate any help you can provide.
ciscen
27 Posts
0
October 20th, 2016 10:00
Thank you very much for the clarification.