MLAG VRRP Member Switch Connection

[Ty_Kolff]

Good Evening,

I was testing a MLAG/VRRP setup today and couldn't get a member switch LAG to connect to the two cores. The two cores seem to be working correctly, they are able to ping each other and the VRRP address that is configured. When I do a "show mlag peer" they see each other just fine.

When I added a member switch and connected a lacp LAG from the member switch to each of the cores, the links light up but there doesn't seem to be any traffic flowing. Do the following configs look correct?

Core Switch 1

configure vlan default delete ports all
configure vr VR-Default delete ports 1:1-64
configure vr VR-Default add ports 1:1-64
configure vlan default delete ports 1:1-64create vlan "isc" configure vlan isc tag 4090 create vlan "Switch-MGMT" configure vlan Switch-MGMT tag 2 enable sharing 1:49 grouping 1:49,1:53 algorithm address-based L2 lacp configure vlan isc add ports 1:49 tagged configure vlan Switch-MGMT add ports 1:1,1:49 tagged configure vlan isc ipaddress 192.168.99.253 255.255.255.252 configure vlan Switch-MGMT ipaddress 10.10.0.2 255.255.252.0 enable ipforwarding vlan Switch-MGMT create vrrp vlan Switch-MGMT vrid 2 configure vrrp vlan Switch-MGMT vrid 2 priority 200 configure vrrp vlan Switch-MGMT vrid 2 preempt delay 5 configure vrrp vlan Switch-MGMT vrid 2 fabric-routing on configure vrrp vlan Switch-MGMT vrid 2 add 10.10.0.1 enable vrrp vlan Switch-MGMT vrid 2 create mlag peer "x670_Bottom" configure mlag peer "x670_Bottom" ipaddress 192.168.99.254 vr VR-Default enable mlag port 1:1 peer "x670_Bottom" id 1

Core Switch 2
configure vlan default delete ports all configure vr VR-Default delete ports 1:1-64 configure vr VR-Default add ports 1:1-64 configure vlan default delete ports 1:1-64 create vlan "isc" configure vlan isc tag 4090 create vlan "Switch-MGMT" configure vlan Switch-MGMT tag 2 enable sharing 1:49 grouping 1:49,1:53 algorithm address-based L2 lacp configure vlan isc add ports 1:49 tagged configure vlan Switch-MGMT add ports 1:1,1:49 tagged configure vlan isc ipaddress 192.168.99.254 255.255.255.252 configure vlan Switch-MGMT ipaddress 10.10.0.3 255.255.252.0 enable ipforwarding vlan Switch-MGMT create vrrp vlan Switch-MGMT vrid 2 configure vrrp vlan Switch-MGMT vrid 2 fabric-routing on configure vrrp vlan Switch-MGMT vrid 2 add 10.10.0.1 enable vrrp vlan Switch-MGMT vrid 2 create mlag peer "x670_Top" configure mlag peer "x670_Top" ipaddress 192.168.99.253 vr VR-Default enable mlag port 1:1 peer "x670_Top" id 1
Member Switch

configure vlan default delete ports all
configure vr VR-Default delete ports 1-54
configure vr VR-Default add ports 1-54
configure vlan default delete ports 1-54

create vlan "Switch-MGMT"
configure vlan Switch-MGMT tag 2
configure ports 49 auto off speed 10000 duplex full
configure ports 50 auto off speed 10000 duplex full
configure ports 51 auto off speed 10000 duplex full
configure ports 52 auto off speed 10000 duplex full
enable sharing 49 grouping 49-50 algorithm address-based L2 lacp
configure vlan Switch-MGMT add ports 49 tagged
configure vlan Switch-MGMT ipaddress 10.10.0.4 255.255.252.0

Thanks!

[Ty_Kolff]

That did work for me. I didn't realize you needed to enable sharing and create an lacp port for a single port, although now it makes sense that the switch then uses the MLAG MAC address for the lacp connection.

I do have one more question, do you need to tag all vlans on the ISC connection between the two MLAG switches?

[BrandonC]

That should be it. Since LACP wasn't enabled on the MLAG peers for the MLAG ports, the downstream switch never added the LAG ports to the aggregator.

Let us know if this fixes it.

-Brandon