OSPF between cisco and Mellanox MLAG interfaces configuration

appi_0 · April 2, 2018, 10:44am

Hi,

I have two MLNX switches in MLAG configuration and one interface from each MLNX switches is connected to cisco L3 switch in mlag-port channel with two ten gig ports in trunk. My question is how to configure ospf configuration between MLNX switches and Cisco on a MLAG-port channel. I have two vlan that are allowed on mlag-port channel trunk, one for management network and other one for a transit network to carry all networks on MLNX over OSPF. Appreciate your help

eddies · April 2, 2018, 11:06am

Hi Nat,

Dynamic routing protocols (e.g. OSPF, BGP) are not supported over MLAG port-channels. If they are necessary, router ports must be used instead of MLAG port-channels.

appi_0 · April 3, 2018, 10:13am

Hi eddie

So even though it works, it’s not supported or not recommended? I have configured ospf on MLAG as below and seems to be working, but I’m not sure if this is supported by mellanox or recommended configuration… I appreciate your help

Physical Connection:

Logical:

I can reach 192.168.2.0/24 network (vlan 2).

MLNXSW1:

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interface mlag-port-channel 1

interface mlag-port-channel 1 switchport mode trunk

interface mlag-port-channel 1 no shutdown

interface mlag-port-channel 1 switchport trunk allowed-vlan none

interface mlag-port-channel 1 switchport trunk allowed-vlan add 999

interface mlag-port-channel 1 switchport trunk allowed-vlan add 10

interface vlan 999

interface vlan 999 ip address 192.168.1.2 255.255.255.0

interface vlan 5

interface vlan 5 ip address 192.168.2.2 255.255.255.0

protocol ospf

router ospf 1 vrf default

router ospf 1 vrf default router-id 10.10.1.11

interface vlan 5 ip ospf area 1.1.1.1

interface vlan 999 ip ospf area 0.0.0.0

vlan 999 name “TransitNet”

vlan 5 name “LAN”

interface vlan 999 magp 999 ip virtual-router address 192.168.1.254

interface vlan 5 magp 5 ip virtual-router address 192.168.2.254

interface vlan 999 magp 999 ip virtual-router mac-address 00:02:AC:999:BC:EF

interface vlan 5 magp 5 ip virtual-router mac-address 00:02:AC:5:BC:EF

MLNXSW2:

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