07-22-2013 04:26 AM - edited 03-07-2019 02:31 PM
Hi,
Can I configure LACP with 2 network ports, one port going to switch 1 and second port going to switch2 and have active active
configuration so that load is shared across 2 links. switch1 and switch2 are two switches in a Cisco 3750 stack configuration.
Connected host is a Solaris host. I know LACP will work with active active configuration if both ports are connected to same switch and
also if both switches are Nexus switch, then if each network port goes to different switch, still we can configure LACP load balancing
with Solaris hosts. Your inputs are highly appreciated and thanks in advance.
Solved! Go to Solution.
07-22-2013 04:58 AM
Hello Subin,
If your two 3750 Catalysts are stacked together then absolutely yes, you can create an EtherChannel with physical ports being connected to different switches in a single stack. Sometimes, this configuration is called Cross-Stack EtherChannel. All switches in a single stack behave like a single big switch, so from the EtherChannel point of view, its rule of "all ports being connected to a single switch" is not violated.
Best regards,
Peter
07-22-2013 07:05 AM
Hello Subin,
Yes, this configuration will work. Please proceed with the configuration and keep us informed.
As I mentioned previously, for most control and data plane protocols and mechanisms including LACP and EtherChannel (Link Aggregation), a stack composed of several Cat3750 switches behaves as a single switch. Therefore, all protocols and mechanisms that you can use towards a single neighbor (such as an EtherChannel) can also be used towards a switch stack.
Best regards,
Peter
07-22-2013 04:58 AM
Hello Subin,
If your two 3750 Catalysts are stacked together then absolutely yes, you can create an EtherChannel with physical ports being connected to different switches in a single stack. Sometimes, this configuration is called Cross-Stack EtherChannel. All switches in a single stack behave like a single big switch, so from the EtherChannel point of view, its rule of "all ports being connected to a single switch" is not violated.
Best regards,
Peter
07-22-2013 05:52 AM
Thanks Peter. Want to confirm once again. I have attached picture of this scenario.
Solaris 11.1 host has two network interfaces, each of which is going to a different 3750 switch
which are stacked. Please let me know whether LACP active active configuration will work
in this case. Thank you.
07-22-2013 05:53 AM
07-22-2013 07:05 AM
Hello Subin,
Yes, this configuration will work. Please proceed with the configuration and keep us informed.
As I mentioned previously, for most control and data plane protocols and mechanisms including LACP and EtherChannel (Link Aggregation), a stack composed of several Cat3750 switches behaves as a single switch. Therefore, all protocols and mechanisms that you can use towards a single neighbor (such as an EtherChannel) can also be used towards a switch stack.
Best regards,
Peter
07-22-2013 07:20 AM
Thanks Peter, this implementation will start only after 1 month, I will update this thread with result, then.
01-13-2019 11:01 AM
Hello Peter,
I have a similar query on the given above situation. What will happen to if the MLAG break between the switches ( between NAS SW switches )and when system id changes for LACP. In the packet capture we see the System ID has changed for LACP on the VMware side. Which NIC will go down or the VMware side , is it suppose to go down also or not ? Attaching the topology for reference as well .
Regards,
UJ
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: